Different complexation behavior of a proton transfer compound obtained from 1,10‐phenanthroline and pyridine‐2,6‐dicarboxylic acid with Sn(IV), Sb(III) and Tl(I)

The different complexation methods of a proton transfer compound, (phenH)₂(pydc) (phen=1,10‐phenanthroline; pydcH₂= pyridine‐2,6‐dicarboxylic acid), are discussed and formation of [Sn(pydc)(phen)(OH)₂]·3H₂O ( 1 ), {[Sb(pydc)(phen)]₂O}·2DMSO·4H₂O( 2 ) and [(Tl(pydcH)]_n ( 3 ) complexes are reported. The characterization was performed using IR spectroscopy and X‐ray diffraction. The structures of Sn(IV) and Sb(III) complexes show that both cationic and anionic fragments of the starting proton transfer compound have been involved in the complexation. Whereas the structure of Tl(I) complex demonstrates that only the anionic fragment of (phenH)₂(pydc) is contributed to the complexation. The complexes 1‐3 show a variety of structural features including mononuclear, binuclear and polymeric structures. In compounds ( 1 ), ( 2 ) and ( 3 ) a large number of hydrogen bonds are observed. These interactions play an important role in the formation and stabilization of supramolecular systems in the crystal lattices. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Two d10 Coordination Complexes Based on the Substitutional Aromatic Multicarboxylate and N-Donor Co-Ligands: Syntheses,Structures, and Properties

Two new coordination complexes, formulated as [Cd₂(3-NPA)(phen)₄(H₂O)₂]₂ (1) and [Zn(3-NPA)(phen)(H₂O)]_n (2) (3-NPAH₂ = 3-nitrophthalic acid, phen = 1,10-phenanthroline) have been synthesized by hydrothermal reactions of the rigid neutral ligand phen with metal ions in the presence of 3-NPAH. X-ray analysis shows that complex 1 is a 0D dinuclear structure that is arranged to form a 3D supramolecular framework through hydrogen bonds and π–π stacking interactions. In polymer 2, the 3-NPA^2? anions coordinate the Cd(II) ions in a tridentate mode to form a 1D infinite chain structure, which is connected by the hydrogen bonds and π–π stacking interactions resulting in a 3D supramolecular architecture. In addition, the two complexes were characterized by infrared spectroscopy, elemental analysis, luminescent properties, thermo gravimetric analysis, and powder X-ray diffraction (PXRD).     

Construction of Three Novel Coordination Complexes by 3-Nitrophthalic Acid Plus N-Donor Ligands: Synthesis,Structure, and Properties

In order to explore new coordination frameworks with novel designed 3-nitrophthalic acid and N–donor ancillary ligands, three novel coordination complexes, namely, [Co₂(3-NPA)₂(2,2′-bipy)₂(H₂O)₂]?2H₂O (1), [Mn₂(3-NPA)₂(4,4′-bipy)₃(H₂O)₆]?(4,4′-bipy) (2), and [Pb₂O(3-NPA)]_n (3) (where 3-NPAH₂ = 3-nitrophthalic acid, 2,2′-bipy = 2,2′-bipyridine, 4,4′-bipy = 4,4′-bipyridine), have been hydrothermally synthesized. X-ray structure analysis reveals that 1 and 2 are dinuclear structures, while 3 is a two-dimensional (2D) network polymer. And the hydrogen bonds and π–π stacking also play important roles in affecting the final structure where complexes 1-2 have 3D and 2D supramolecular architectures, respectively. These complexes have been characterized by powder X-ray diffractions (PXRD) and thermal gravimetric analyses (TGA). In addition, their photochemical properties have also been investigated.     

Synthesis,Crystal Structure,and Properties of Two Zinc Tubular Coordination Polymers Based on Fluconazole

Two Zn(II)-containing complexes based on fluconazole, {[Zn(HFlu)₂(IPA)]·9H₂O}_n (1), {[Zn(HFlu)₂(OH-BDC)]·8H₂O}_n (2) (HFlu = fluconazole; 2-(2,4-difluoro- phenyl)-1,3-bis(1,2,4-triazol-1-yl)-propan-2-ol; H₂IPA = isophthalic acid; OH-H₂BDC = 5-hydroxyisophthalic acid) have been synthesized and structurally characterized. Complex 1 and 2 are both a one-dimensional (1D) tubular structure with the distorted dinuclear zinc rectangular-shaped cavity, and large free water molecules involved in strong O?H···O and O?H···N hydrogen bonds are accommodated in the 1D tubular structure. The thermal stabilities and photoluminescent properties of the coordination polymers have also been investigated.     

Synthesis,Crystal Structure and Characterizations of New 3,4,7,8-Tetrachloro-1,10-Phenanthroline Zn(II) Complex

Abstract  

A novel 3,4,7,8-tetrachloro-1,10-phenanthroline (Cl₄phen) Zn(II) complex has been synthesized. The complex, [Zn(Cl₄phen)₂(H₂O)₂](NO₃)₂·CH₃CH₂OH (1), has been identified and characterized by single crystal X-ray diffraction, elemental analysis, FT-IR, thermogravimetric analysis and photoluminescence studies. Single crystal X-ray diffraction analysis reveals that complex (1) belongs to the monoclinic system, space group P2(1)/c, a = 10.061(2) Å, b = 18.924(4) Å, c = 18.189(4) Å, β = 100.94(3)°, and Z = 4. Complex (1) consists of cationic species [Zn(Cl₄phen)₂(H₂O)₂]²⁺, NO₃ ⁻ and CH₃CH₂OH. The zinc atom displays a distorted cis-N₄O₂ octahedral geometry. Via extended Zn–O–H···O–N–O···H–O–Zn bridge, every mononuclear unit is linked with other ones to form one-dimensional (1D) infinite chain of hydrogen bond system. Three-dimensional (3D) polymeric network arrangement was built via weak C–H···O and π-stacking interactions between Cl₄phen moieties. A solvent-dependency effect of complex (1) was observed in spectroscopic properties.     

Novel Complexes of Zinc(II) with Different Proton Transfer Ion Pairs Obtained from Dipicolinic Acid: Synthesis, Characterization and X-ray Crystal Structure

Abstract  Three new complexes of zinc(II) with three different proton transfer compounds, obtained from pyridine-2,6-dicarboxylic acid (dipicolinic acid) and different Lewis bases, were synthesized and characterized using IR, ¹H NMR and ¹³C NMR spectroscopy and single crystal X-ray diffraction. The chemical formulae and space groups of the complexes are (pipzH₂)[Zn(pydc)₂] · 4H₂O, P2₁/n (1), (EDGnH₂)[Zn(pydc)₂] · 3H₂O, P2₁/c (2) and (pdaH₂)[Zn(pydc)₂] · 4H₂O, (3) where pydc, pipz, EDGn and pda are standing for dipicolinic acid, piperazine, ethylenediguanidine and 1,3-propanediamine respectively. Cell parameters of the complexes are a = 7.9493(4) ?, b = 13.4386(7) ?, c = 21.0557(11) ?, β = 90.415(5)° for 1; a = 9.785(3) ?, b = 25.671(4) ?, c = 9.3402(16) ?, β = 90.790(17)° for 2 and a = 8.411(5) ?, b = 11.650(7) ?, c = 12.793(8) ?, α = 115.534(9)°, β = 92.791(10)°, γ = 97.778(10)° for 3. The three crystal structures illustrate that the metal ion is six-coordinated by two pydc’s. In all three compounds a large number of O–H⋯O, N–H⋯O and C–H⋯O hydrogen bonds are observed. These interactions as well as other noncovalent interactions such as ion–pairing and π–π stacking play an important role in the formation and stabilization of supramolecular systems in the crystal lattices. Index Abstract  The main purpose of this paper is to report and discuss about the synthesis, characterization, crystal structure and non-covalent interactions of three supramolecular frameworks of six-coordinated Zn(II) complexes, obtained by the reaction of different proton transfer compounds, i.e. (pipzH₂)(pydc), (EDGnH₂) (pydc) · 3H₂O and (pdaH₂)(pydc) · (pydcH₂) · 2.5H₂O with corresponding metallic salts.      

Pyridine-2,6-Dicarboxylic Acid (Dipic): Crystal Structure from Co-Crystal to a Mixed Ligand Nickel(II) Complex

Abstract  

Pyridine-2,6-dicarboxylic acid (dipic) was used for the synthesis of a co-crystal with 1,10-phenanthroline-5,6-dione (phen-dione) and a nickel(II) complex. The co-crystal dipic·phen-dione·4H₂O (1) has been synthesized and studied by X-ray crystallography. The structure is stabilized with hydrogen bonds between dipic, H₂O and phen-dione. It is surprising that there is no direct hydrogen bonding between phen-dione and dipic and yet the molecules co-crystallize in aqueous solution. A new complex of nickel(II), [Ni(phen)(dipic)(H₂O)]·4H₂O (2), (where phen = 1,10-phenanthroline) has been synthesized and characterized by elemental and thermogravimetric analyses, FT-IR, UV–Vis and ¹H-NMR spectroscopy. The structure of (2) has been studied by X-ray crystallography. The coordination around Ni(II) is a distorted octahedron. The crystal packing shows that the dimensionality of (2) is enlarged to 3D, through hydrogen bonds and π–π interactions. Cyclic voltammetry of (2) shows that the Ni(II/I) couple is irreversible.     

A two-dimensional Zn(II) coordination polymer with a three-dimensional supramolecular architecture comprising 5-dimethylamino-isophthalic acid and 1,3-bis(4-pyridyl)propane

A new zinc coordination polymer, [Zn(L)(bpp)·H₂O]_n, was synthesized using 5-dimethylamino-isophthalic acid (H₂L) and 1,3-bis(4-pyridyl)propane (bpp) as organic linkers. In the complex, adjacent Zn²⁺ ions are linked by L^2? anions to form a one-dimensional (1D) [ZnL]_n chain. Then bpp ligands expand the 1D chains into a corrugated two-dimensional (2D) layer network by linking neighboring Zn²⁺ ions. These adjacent layers are further stacked together by direct C?H···π supramolecular interactions, generating a three-dimensional (3D) supramolecular structure. From the viewpoint of topology, the 2D network can be rationalized to a uninodal four-connected non-interpenetrated sql/Shubnikov tetragonal plane net with {4⁴.6²} topology. Moreover, the solid state properties such as thermogravimetric analysis and luminescence were also investigated.     

Synthesis,characterization and crystal structure of a 3‐D supramolecular Cu/Mn complex with pydc

A supramolecular compound, {[CuMn(pydc)₂(H₂O)₅]·2H₂O} ( 1 ) (pydc = pyridine‐2,6‐dicarboxylate dianion), has been synthesized and characterized by single‐crystal X‐ray diffraction. Single‐crystal X‐ray analysis reveals that it crystallizes in the triclinic space group P‐1, a = 8.4763(17) Å, b = 9.7715(19) Å, c = 13.909(3) Å, α =101.234(3)°, β =102.520(3)°, γ= 97.375(4)°. Two mixed‐metal ions exhibit similar coordinated geometries with octahedron. 1 possesses a 3‐D unusual supramolecular network featuring 1D water tape. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Synthesis and Crystal Structure of a 1D Coordination Polymer [Cd(pydc)(phen)]<Subscript>n</Subscript> (H<Subscript>2</Subscript>pydc = pyridine-2,3-dicarboxylic acid,phen = 1,10-phenanthroline)

Abstract  A new 1D coordination polymer, [Cd(pydc)(phen)]_n (1) (pydc = pyridine-2,3-dicarboxylic acid, phen = 1,10-phenanthroline), has been hydrothermally synthesized and characterized by the elemental analysis, IR spectroscopy and single crystal X-ray diffraction. X-ray diffraction analysis reveals that 1 (C₁₉H₁₁CdN₃O₄) crystallizes in triclinic space group P-1, features an interesting 3D zipper-like network constructed from 1D ribbons via π–π stacking interactions. Unit cell parameters for 1: a = 7.681(1) ?, b = 10.546(2) ?, c = 11.358(2) ?, α = 107.12(2)°, β = 99.50(2)°, γ = 109.12 (2)° and Z = 2. Index Abstract  The title compound, [Cd(pydc)(phen)]n (1) (pydc = pyridine-2,3-dicarboxylic acid, phen = 1,10-phenanthroline), has been hydrothermally synthesized and characterized. X-ray diffraction analysis reveals that 1 features an interesting 3D zipper-like networks constructed by 1D ribbons via π–π stacking interactions.      

Hydrogen Bonded Supramolecular Network from a Mixed Valence Cobalt System: Synthesis and Crystal Structure of [Co(H2O)6][Co(pydc)2(en)]2·14H2O

Abstract  

The [Co(H₂O)₆][Co(pydc)₂(en)]₂·14H₂O (1) compound (H₂pydc = Pyridine-2,3-dicarboxylic acid and en = ethylenediamine) was synthesized and characterized by elemental analysis, magnetic and spectroscopic measurements (UV–Vis and IR spectra) and single crystal X-ray diffraction technique. There are two coordination spheres with different charges inside this aqueous compound of ionic character. The cationic part is composed of Co(II) encircled by six aqua ligand. Whereas the anionic part contains two anions complex unit each with −1 charge and have Co(III) ions in the centre. As a result different coordination spheres have cobalt ions with different states. The crystallographic analysis revealed that 1 consists of both discrete one-cationic and two-anionic entities, [Co(H₂O)₆]²⁺ and [Co(pydc)₂(en)]₂⁻ and fourteen crystal water molecules. Two water molecules within the water cluster act as hydrogen-bonding acceptors, whereas one water molecule acts as a hydrogen-bonding donor to form a discrete water trimer. These water molecules have stabilized the crystal structure by strong hydrogen bonding interactions.     

Self-assemblies of Ni(II) with phenanthroline and maleate anions: [Ni(H2O)3(phen)L] ⋅ H2O (1) and [Ni(H2O)2(phen)L] ⋅ 2H2O (2) with H2L = maleic acid

The complex [Ni(H₂O)₃(phen)(C₄H₂O₄)] H₂O (1), which was obtained by reaction of phenanthroline, Ni(NO₃)₂ 6H₂O, and maleic acid in CH₃OH/H₂O at pH = 7.05, crystallized in the monoclinic space group P2₁ (no. 4) with cell dimensions: a = 9.350(1) Å, b = 7.631(1) Å, c = 12.821(1) Å, = 106.25(1), and D _calc = 1.607 g/cm³ for Z = 2. The Ni atoms are each octahe drally coordinated by one chelating phen ligand, three H₂O molecules and one monodentate maleato ligand to form [Ni(H₂O)₃(phen)(C₄H₂O₄)] complex molecules with d(Ni–O) = 2.038–2.090 Å, d(Ni–N) = 2.066, 2.089 Å. The formed complex molecules are, via the intermolecular hydrogen bonds, assembled into columnar 1D chains. Interdigitation of the chelating phen ligands of the neighboring chains leads to 2D layers and the crystal H₂O molecules are hydrogen bonded to the oxygen atoms of the maleate not coordinated to the Ni atom. However, reaction of NiCO₃, phen, and maleic acid in CH₃OH/H₂O at pH = 6.33 afforded [Ni(H₂O)₂(phen)(C₄H₂O₄)] 2H₂O (2), which crystallized in the triclinic space group (no. 2) with cell dimensions: a = 7.971(1) Å, b = 8.237(1) Å, c = 13.304(1) Å, = 81.005(6)°, = 87.877(8)°, = 78.322(8)°, and D _calc = 1.671 g/cm³ for Z = 2. The Ni atoms are each octahedrally coordinated by two N atoms of one phen ligand and four O atoms of two H₂O molecules and two bis–monodentate maleato ligands with d(Ni–O) = 2.041–2.120 Å and d(Ni–N) = 2.095 Å. The Ni atoms are bridged by the maleato ligands to generate 1D ¹ [Ni(H₂O)₂(phen)(C₄H₂O₄)_2/2] chains along [100]. The supramolecular assemblies of the 1D chains via – stacking inter- actions result in thick 2D layers parallel to (001), between which the noncoordinating H₂O molecules are sandwiched. The paramagnetic [Ni(H₂O)₂(phen)(C₄H₂O₄)_2/2] 2H₂O (2) obeys the Curie–Weiss law _m(T-) = 1.139cm³ mol^–1 K with the Weiss constant = –0.95 K.     

Synthesis,characterization and X‐ray crystal structure of guanidinuim (pyridine‐2,6‐dicarboxylato)(pyridine‐2,6‐monocarboxylato) zincate(II) mono pyridine‐2,6‐dicarboxylic acid tetrahydrate

A new complex of Zinc(II) and guanidinium pyridine–2,6–dicarboxylate proton transfer compound, (GnH)₂ (pydc), was synthesized and characterized using IR, ¹H NMR and ¹³C NMR spectroscopy and single crystal X–ray diffraction. The chemical formula and space group of the resulting complex is (GnH)[Zn(pydc)(pydcH)] · (pydcH₂) · 4H₂O, P 1 where the final R value is 0.0310 for 13287 reflections collected. The [Zn(pydc)(pydcH)]^– anions and the (GnH)⁺ counter‐cations form a three‐dimensional solid‐state structure by a variety of noncovalent interactions such as ion pairing, hydrogen bonding and π–π stacking which are going to be discussed. (© 2007 WILEY ‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Two Ag(I)-Containing Supramolecular Coordination Polymers Constructed from the Multidentate N-donor Ligand 1-((1H-1,2,4-triazol-1-yl)methyl)-3,5-bis(3-pyridyl)-1,2,4-triazole Based on Hydrogen-Bonding and π–π Interactions: Syntheses,Crystal Structures,Optical Band Gaps and Luminescent Properties

Two Ag(I)-based coordination polymers, namely [Ag₂(3,3′-tmbpt)(o-Hbdc)₂]·H₂O (1) and [Ag₈(3,3′-tmbpt)₄(1,2,4-Hbtc)₄(H₂O)] (2) (3,3′-tmbpt?=?1-((1H-1,2,4-triazol-1-yl)methyl)-3,5-bis(3-pyridyl)-1,2,4-triazole, o-H₂bdc?=?1,2-benzenedicarboxylic acid and 1,2,4-H₃btc?=?1,2,4-benzenetricarboxylic acid), have been synthesized. Single-crystal X-ray diffraction analyses, elemental analyses, infrared spectra, powder X-ray diffraction analyses and thermogravimetric analyses have been carried out to characterize the structures of 1 and 2. Compound 1 shows a (3,4)-connected 2D layered structure with a Schläfli symbol of (4²·6)(4²·6³·8). The intermolecular O–H···O hydrogen-bonding interactions extend the 2D layer into a 3D supramolecular architecture. Compound 2 exhibits a (3,3)-connected double-layered structure with a Schläfli symbol of (4·8·10)₂(8²·10)₂. The intermolecular C–H···O hydrogen-bonding interactions link the double-layers to form a 3D supramolecular architecture. Moreover, there are intramolecular and intermolecular π–π interactions in 1 and 2, which stabilize the whole 3D supramolecular architectures. The band gaps of 1 and 2 are 3.19 and 3.09 eV, respectively, indicating the potential of 1 and 2 as semiconductive materials with wide band gaps. Moreover, 1 and 2 emit intense blue-green light, which may be potential photoactive materials.

Graphic Abstract

Two Ag(I)-based 3D supramolecular coordination polymers constructed from a multidentate N-donor ligand and two aromatic polycarboxylate anions via hydrogen-bonding and π–π interactions have been synthesized and characterized. The band gaps and photoluminescent properties of the compounds have been studied.

     

Zn(II) and Cd(II) Complexes Extended Structures Sustained by Hydrogen Bonding, π–π and C–H···π Interactions

Abstract  

Two new complexes [Zn(sal)₂(tpt)]·H₂O(1), [Cd(sal)₂(tpt)(H₂O)]·H₂O(2), have been obtained through ligands tpt and Hsal, where Hsal is salicylic acid and tpt is 2,4,6-tripyridyl-1,3,5-triazine, reacting with Zn(II) and Cd(II) salts. Their structures are fully characterized by IR spectroscopy, elemental analysis, single crystal X-ray diffraction. In complex 1, Zn(II) is coordinated by three N atoms and two O atom with a distorted square pyramidal coordination geometry. In 2, Each Cd(II) atom is seven-coordinated with a distorted pentagonal bipyramidal coordination geometry. The structural differences between two complexes show the influence of the coordinating orientation of metal ions. These two mononuclear complexes are further extended into three-dimensional structure via π–π, C–H···π and hydrogen bonding interactions. The solid state luminescent properties of complex 1, 2 are also reported.     

Synthesis,Crystal Structure and DNA-Binding Study of a New Zinc(II) Complex Based on 2,6-Bis(imino)pyridyl Ligand

A new zinc complex [Zn(L1)Cl₂]₂?CH₃OH?2H₂O (complex 1), where L1 stands for 2,6-Bis{[(4-ethylphenyl)imino]ethyl}pyridine (L1) has been synthesized and characterized. The crystal structure of L1 and complex 1 have been determined by single-crystal X-ray diffraction. Both compounds crystallize in the monoclinic P2₁/c space group. For the ligand L1, the crystal parameters are a?=?16.7487(7) Å, b?=?5.8177(3) Å, c?=?21.8427(10) Å, β?=?104.1350(10)° and Z?=?4. For complex 1, the crystal parameters are a?=?8.0216(14) Å, b?=?13.433(2) Å, c?=?24.640(4) Å, β?=?90.223(3)° and Z?=?2. In the crystal structure of complex 1, L1 acts as a tridentate ligand and coordinated with Zn1 with three nitrogen atoms. Together with two chlorine atoms, Zn1 atom is five-coordinated in a trigonal bipyramidal geometry. Hydrogen bonds play great role in the crystal structure of complex 1 and form a two-dimensional network. Furthermore, the DNA-binding property of complex 1 with fish sperm DNA (FS-DNA) has been investigated by electronic absorption titration. The result suggests that complex 1 might interact with FS-DNA via groove binding mode.

Graphical abstract

The single crystals of 2,6-Bis{[(4-ethylphenyl)imino]ethyl}pyridine (L1) and it’s Zinc(II) complex [Zn(L1)Cl₂]?CH₃OH?H₂O (1) were determined. In the crystal structure of complex 1, Zn1 atom is five-coordinated in a trigonal bipyramidal geometry. A two-dimensional network is formed by hydrogen bonds. DNA-binding study indicated that complex 1 interact with FS-DNA via groove binding mode.

     

Syntheses,Structures and Luminescent Properties of Zinc(II) and Cadmium(II) Complexes With the Ditopic Ligand 1,3-Bis(imidazol-1-ylmethyl)benzene

Abstract  

Three new complexes, namely [Zn(mbix)(SO₄)]·CH₃OH (1), Cd(mbix)₂(NO₃)₂ (2) and [Cd(mbix)₂(H₂O)₂]·(NO₃)₂ (3), have been obtained by reactions of flexible bidentate ligand 1,3-bis(imidazol-1-ylmethyl)benzene (mbix) with corresponding zinc(II) and cadmium(II) salts. The structures of these complexes have been determined by the X-ray single crystal diffraction analysis. Complex 1 features a 2D wavy network with (4,4) topology. Complex 2 has a 2D grid network with left- and right-handed helical chains, while complex 3 exhibits twofold parallel interpenetration structure. The differences of three complexes demonstrate that the coordination geometry of metal ions and the ratio of reactants have a great impact on the structure of the supramolecular architectures. The luminescent properties of three complexes are also investigated.     

The crystal structure of aluminium,iron (III), and gallium acid phosphites

The structures of three acid phosphites of trivalent metals [Al(HPO₃H)₃(H₂O)] · H₂O (I), K[Fe(HPO₃H₄)] (II), and Rb₃[Ga(HPO₃H)₆] (III) have been determined. Structure I is layered, complex anions [Fe(HPO₃H)₄]⁻ form polymer chains in structure II, and structure III is insular.     

Supramolecular Cobalt(II), Copper(II) and Cadmium(II) Complexes Obtained from a Proton Transfer Compound including Pyridine-2,6-dicarboxylate and Propane-1,3-diaminium Ions; Synthesis,Characterization and Crystal Structure

Abstract The three complexes (pnH₂)[Co(pydc)₂]·4H₂O 1, (pnH₂)[Cu(pydc)₂]·4H₂O 2, and (pnH₂)[Cd(pydc)₂]·3.5H₂O 3 (pn: propane-1,3-diamine, pydc: pyridine-2,6-dicarboxylate) were prepared using a proton transfer compound (pnH₂)(pydc)·(pydcH₂)·2.5H₂O, LH ₂ and corresponding metallic salts. The characterization was carried out using elemental analysis, IR and NMR spectroscopy, and single crystal X-ray diffraction. Complexes 1 and 2 crystallize in space group P , but complex 3 crystallizes in space group P2/c. Cell parameters of the complexes are a = 8.449(1) ?, b = 11.668(1) ?, c = 12.801(1) ?, α = 115.748(2)°, β = 93.038(2)°, γ = 97.867(2)° for 1; a = 7.973(2) ?, b = 16.632(2) ?, c = 25.280(5) ?, α = 94.178(6)°, β = 95.186(6)°, γ = 91.603(5)° for 2 and a = 20.055(1) ?, b = 13.8161(9) ?, c = 8.2418(5) ?, β = 100.086(1)° for 3. The three crystal structures illustrate that the metal ion is six-coordinated by two pydc’s. In structures of 2 and 3, it can be seen that propane-1,3-diaminium fragments have different conformations. The complexes have ion-pairing interactions, O–H···O, N–H···O and C–H···O hydrogen bonds, π–π stacking as well as van der Waals forces as the main factors in formation of their supramolecular structures. Index Abstract Supramolecular Cobalt(II), Copper(II) and Cadmium(II) Complexes Obtained from a Proton Transfer Compound including Pyridine-2,6-dicarboxylate and Propane-1,3-diaminium Ions; Synthesis, Characterization and Crystal Structure Hossein Aghabozorg, Mohammad Ghadermazi,Bahar Nakhjavan, Faranak Manteghi The synthesis, characterization, crystal structure and non-covalent interactions of three supramolecular complexes of Co(II), Cu(II) and Cd(II) obtained by the reaction of a proton transfer compound i.e. (pnH₂)(pydc)·(pydcH₂)·2.5H₂O with the corresponding metallic salts are reported. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.     

3D Solid-State Network from Hierarchical Supramolecular Self-Assembly of Transition Metal Complexes of Pyridine Based Ligand

Abstract  The crystal structures of [Cu(py)₄(ClO₄)](ClO₄) (1), [V(pic)₂(OH)](NO₃)₂ · H₂O (2) and [Ni(H₂O)₆][Ni(dpa)₂] · 2H₂O (3) [py = Pyridine, picH = Pyridine-2-carboxylic acid, dpaH₂ = Pyridine-2,6-dicarboxylic acid] was determined by single-crystal X-ray diffraction techniques. Solid-state structural analysis shows that all these complexes from extensive 3D network structure via supramolecular self-assembly. The crystal structures are stabilized by extended hydrogen bonding interactions. The complex 2 forms orange V₂O₅ micro spheroids when heated at ~400 °C for 6 h. Graphical Abstract  Hierarchical supramolecular self-assembly of transition metal complexes of pyridine based ligands in crystal. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.