Syntheses,crystal structures,and IR spectra of isonicotinamide-isonicotinamidium bis(isonicotinamide)-tetrakis(isothiocyanato)ferrate(III) and isonicotinamidium chloride

Reaction of iron(III) thiocyanate with isonicotinamide (inia) in ethanol leads to formation of a dark red, air stabile crystalline iron(III) compound of composition [iniaH·inia][Fe(inia)₂(NCS-N)₄]. Single-crystal X-ray diffraction analysis shows the triclinic P–1 space group with unit cell parameters: a?=?8.2440(4)?Å, b?=?9.5540(3)?Å, c?=?11.2590(5)?Å, α?=?93.945(4)°, β?=?95.554(4)°, γ?=?96.285(3)°, and Z?=?1. The iron compound contains [iniaH·inia]⁺ cations and [Fe(inia)₂(NCS-N)₄]^– anions, which are held together by ionic interactions and hydrogen bonding. The Fe(III) is octahedrally coordinated by six nitrogens, four from NCS^– in the equatorial plane and two from inia occupying axial positions. The [iniaH]Cl has been formed by reaction of inia with hydrochloric acid. [iniaH]Cl crystallized in the monoclinic C2/c space group with unit cell parameters: a?=?25.156(5)?Å, b?=?5.095(1)?Å, c?=?12.747(3)?Å, and Z?=?8. Both compounds have also been characterized by elemental analyses and infrared spectroscopy. Structural and infrared spectral data are compared with data of similar compounds in the literature.     

Syntheses,crystal structures,and catalysis by polymeric dioxomolybdenum(VI) complexes with similar (iso)nicotinohydrazones

Polymeric dioxomolybdenum(VI) complexes, [MoO₂L]_n (L?=?L¹?=?N′-(2-hydroxybenzylidene)nicotinohydrazide for 1, L?=?L²?=?N′-(2-hydroxy-5-methoxybenzylidene)isonicotinohydrazide for 2), were prepared and characterized by physico-chemical, spectroscopic methods, and single-crystal X-ray determination. Complex 1 crystallizes in the orthorhombic space group P2₁2₁2₁ with a?=?7.6568(4), b?=?11.6315(7), c?=?15.2211(9)?Å, V?=?1355.59(13)?ų, Z?=?4, R ₁?=?0.0181, wR ₂?=?0.0464, and S?=?1.097. Complex 2 crystallizes in the monoclinic space group P2 ₁ /n with a?=?11.2516(6), b?=?11.8134(7), c?=?12.4371(6)?Å, β?=?116.2210(10)°, V?=?1483.02(14)?ų, Z?=?4, R ₁?=?0.0399, wR ₂?=?0.0874, and S?=?1.096. X-ray analysis indicates that Mo in each complex is octahedral with two oxo groups and N₂O₂ donor set of the nicotinohydrazone or isonicotinohydrazone. The complexes are efficient catalysts for oxidation of olefins.     

Syntheses and crystal structures of two maleonitriledithiolate complexes containing the 1-(R-benzyl)pyrazinium cation (R = 4′-nitro or 4′-bromo)

The complexes [NO₂BzPz]₂[Ni(mnt)₂] (1) and [BrBzPz]₂[Pd(mnt)₂] (2) have been prepared by reaction of Na₂mnt, NiCl₂·6H₂O or PdCl₂, and the corresponding 1-(R-benzyl)pyrazinium bromide salt (R = 4′-nitro, R = 4′-bromo). Crystallographic data for 1: monoclinic, P2₁/n, a = 7.3494(15), b = 15.223(3), c = 15.054(3)?Å, β = 102.42(3)°, V = 1644.8(6)?ų, Z = 2. Data for 2: monoclinic, P2₁/n, a = 7.399(2), b = 19.024(4), c = 12.224(2)?Å, β = 94.62(3)°, V = 1715.0(7)?ų, Z = 4. In both complexes, the [M(mnt)₂]^2? anion has a centre of symmetry at the metal atom and two cations are related to each other by the symmetry centre. The [M(mnt)₂]^2? anion exhibits a quasi-planar structure in both complexes, which show similar crystal packing.     

Synthesis and structures of two molybdenum(VI) complexes derived from similar benzohydrazone ligands with catalytic properties

Two new structurally similar molybdenum(VI) complexes, [MoO₂L¹(CH₃OH)] (1) and [MoO₂L²(CH₃OH)] (2), where L¹ is the dianionic form of N′-(2-hydroxy-5-nitrobenzylidene)-2-methylbenzohydrazide and L² is the dianionic form of N′-(2-hydroxy-4-methoxybenzylidene)-2-methylbenzohydrazide, were prepared and structurally characterized by elemental analysis, infrared spectra, and single-crystal X-ray diffraction. 1 crystallizes in the monoclinic space group P2₁/c, with unit cell dimensions a?=?7.941(1), b?=?14.337(2), c?=?15.141(2)?Å, β?=?92.782(2)°, V?=?1721.8(4)?ų, Z?=?4, R₁?=?0.0286, wR₂?=?0.0650, GOOF?=?1.028. 2 crystallizes in the triclinic space group P-1, with unit cell dimensions a?=?8.003(1), b?=?10.608(1), c?=?10.880(1)?Å, α?=?95.745(2)°, β?=?97.627(2)°, γ?=?105.762(2)°, V?=?872.0(2)?ų, Z?=?2, R₁?=?0.0226, wR₂?=?0.0595, GOOF?=?1.116. X-ray analysis indicates that Mo in the complexes are coordinated by the phenolate oxygen, imino nitrogen, and enolate oxygen of the benzohydrazone, methanol, and two oxo groups, generating octahedral coordination. The oxidation of olefins with the complexes as catalysts was evaluated, indicating that the complexes showed excellent catalytic efficiency in oxidation of most aliphatic and aromatic substrates under mild conditions using tert-butyl hydrogen peroxide as oxidant.     

Hydrothermal syntheses,crystal structures,and thermal stability of two new 3D open-framework metal(II) phosphonates

This article reports the hydrothermal synthesis and characterization of two new phosphonate compounds NaCo[O₃PCH(OH)CO₂] (1) and NaMn[O₃PCH(OH)CO₂] (2) based on 2-hydroxyphosphonoacetic acid (H₃L). Their structures have been characterized by single-crystal X-ray diffraction as well as with elemental analysis, infrared spectroscopy and thermogravimetric analysis. The two isomorphous compounds crystalline in the orthorhombic, space group Pbca: Crystal data for 1: a?=?10.1827(8)?Å, b?=?9.6673(8)?Å, c?=?10.7853(9)?Å, V?=?1061.70(15)?ų, Z?=?8, R ₁?=?0.0252, wR ₂?=?0.0577; Crystal data for 2: a?=?10.4309(18)?Å, b?=?9.7913(17)?Å, c?=?10.9012(19)?Å, V?=?1113.4(3)?ų, Z?=?8, R ₁?=?0.0194, wR ₂?=?0.0536. In the two compounds, the metal atoms are octahedrally coordinated; all oxygen atoms from the H₃L ligand are involved in coordination. The overall structures can be described as a 3D open framework with channels running along the a axis and the charge-compensating Na⁺ cations being located at the intersections of these channels.     

Comment on the section: “Antioxidant measurements and hydroxyl radical scavenging activity” in synthesis,characterization, DNA binding,and antioxidant activities of four copper(II) complexes containing N-(3-hydroxybenzyl)-amino amide ligands,by Zhi Li-Hua,Wu Wei-Na,Wang Yuan,Sun Guang,J. Coord. Chem., 66, 227 (2013)

Two structurally similar vanadium(V) complexes, [VOL¹L] (1) and [VOL²L] (2), where L¹ is the dianionic form of N′-(3,5-dibromo-2-hydroxybenzylidene)-4-methoxybenzohydrazide, L² is the dianionic form of N′-(3,5-dibromo-2-hydroxybenzylidene)nicotinohydrazide, and L is benzohydroxamate, were prepared and characterized by elemental analysis, infrared spectra, and single crystal X-ray diffraction. 1 crystallizes in the monoclinic space group P2₁/c, with unit cell dimensions a?=?12.0262(7), b?=?16.5629(9), c?=?12.3449(8)?Å, β?=?105.160(2)°, V?=?2373.4(2)?ų, Z?=?4, R₁?=?0.0376, wR₂?=?0.0844, GOOF?=?1.058; 2 crystallizes in the monoclinic space group P2₁/c, with unit cell dimensions a?=?10.6439(7), b?=?16.1968(9), c?=?13.1108(8)?Å, β?=?104.180(2)°, V?=?2191.4(2)?ų, Z?=?4, R₁?=?0.0521, wR₂?=?0.1142, GOOF?=?1.018. X-ray analysis indicates that vanadium in the complexes are coordinated by phenolate oxygen, imino nitrogen, and enolate oxygen of the hydrazone, two oxygens of the benzohydroxamate, and one oxo, generating octahedral coordination. Oxidations of olefins with the complexes as catalysts were evaluated. The complexes showed effective catalytic efficiency in oxidation of several aliphatic and aromatic substrates under mild conditions, using tert-butyl hydrogen peroxide as oxidant.     

Synthesis,structure and magnetic properties of a two-dimensional polymer based on sandwich-type tetra-cobalt(II)-substituted polyoxotungstate anions and 1-D potassium-chains

A 2-D coordination polymer, (C₇N₄H₁₆)₂{NH(CH₃)₃}[{K(H₂O)}₄Na(H₂O)₅{Co₄(H₂O)₂(B-α-PW₉O₃₄)₂}]·2H₂O (1), was hydrothermally synthesized and structurally characterized by IR spectroscopy, elemental analysis, X-ray powder diffraction, and X-ray single-crystal crystallography. Crystal structure analysis shows a triclinic space group Pī with a?=?12.4677(8)?Å, b?=?12.5054(8)?Å, c?=?18.5745(1)?Å, α?=?73.3220(1)°, β?=?87.1890(1)°, γ?=?62.2710(1)°, and V?=?2443.4(3)?ų. Sandwich-type tetra-cobalt(II)-substituted [Co₄(H₂O)₂(B-α-PW₉O₃₄)₂]^10? of 1 consists of two trivacant Keggin [B-α-PW₉O₃₄]^9? moieties and a rhomb-like Co₄O₁₆ unit. Each sandwich-type polyoxotungstate subunit connects 12 K(1) and K(2) centers from two adjacent 1-D K-chain units resulting in an interesting 2-D layer framework. Magnetic properties of 1 have been investigated.     

Syntheses,crystal structures and magnetic study of two binuclear manganese(II) complexes with aromatic N-oxide as bridging ligand

Two new binuclear complexes, [Mn₂(μ-dmpo)₂(SCN)₄(H₂O)₂] (1) (where dmpo?=?3,5-dimethylpyridine N-oxide), [Mn₂(μ-po)₂(H₂O)₆I₂]I₂ (2) (where po?=?pyridine N-oxide), have been synthesized and their crystal structures determined by X-ray crystallography. Complexes 1 and 2 crystallize in monoclinic, space group P2₁/c, with unit cell dimensions a?=?8.8836(18)?Å, b?=?15.450(3)?Å, c?=?15.484(3)?Å, β?=?91.020(3)° for 1, and a?=?8.8352(13)?Å, b?=?17.927(3)?Å, c?=?8.3338(12)?Å, β?=?103.765(2)° for 2. In each binuclear complex two Mn(II) were bridged by two 3,5-dimethylpyridine N-oxides or by two pyridine N-oxides and the distances between the bridged Mn(II) ions are 3.599?Å for 1 and 3.552?Å for 2. Variable temperature (4–300?K) magnetic measurements were performed for 1 and the susceptibility data were fitted by using a binuclear Mn(II) magnetic coupling formula producing the 2J?=??2.17?cm^?1.     

Syntheses,crystal structures,and antimicrobial activities of nickel(II) and cadmium(II) complexes with 4-methylsulfonyl cinnamate and diamines

Two metal complexes, [Ni^II(mscinn)₂(pda)₂] (1) and [Cd^II(mscinn)₂(dmeda)₂·2H₂O] (2) (mscinn?=?4-methylsulfonyl cinnamate, pda?=?propane-1,3-diamine, dmeda?=?N′,N′-dimethylethane-1,2-diamine), were synthesized by reacting 4-methylsulfonyl cinnamate with the diamines and metal salts. Their structures were determined by single-crystal X-ray diffraction analysis. Crystal parameters of 1: C₂₆H₃₈N₄NiO₈S₂, M?=?657.43, monoclinic, P2₁/c, a?=?16.6123(8)?Å, b?=?8.5956(4)?Å, c?=?11.2047(5)?Å, β?=?107.423(1)°, V?=?1526.54(12)?ų, Z?=?2, D _calcd?=?1.430?g?cm^?3, F(000)?=?692, μ?=?0.825?mm^?1, R ₁?=?0.0257, wR ₂?=?0.0669. Crystal data of 2: C₂₈H₄₂CdN₄O₈S_2?·?2(H₂O), M?=?775.24, monoclinic, P2₁/c, a?=?9.8278(4)?Å, b?=?11.6611(5)?Å, c?=?15.3972(7)?Å, β?=?96.195(1)°, V?=?1754.26(13)?ų, Z?=?2, D _calcd?=?1.468?g?cm^?3, F(000)?=?804, μ?=?0.798?mm^?1, R ₁?=?0.0299, wR ₂?=?0.0770. Antimicrobial activities for 1 and 2 against Escherichia coli, Pseudomonas putida, Bacillus subtilis, and Bacillus cereus had better antibacterial activity than their parent carboxylic acid against Gram-positive bacteria (B. subtilis and B. cereus). The cadmium complex of the cinnamate displayed high inhibitory activity with an MIC value of 5?µg?mL^?1 against P. putida, while the nickel complex also exhibited good inhibitory potency with an MIC value of 5?µg?mL^?1 against B. subtilis.     

Synthesis,crystal structure and magnetic properties of [1-(4′-bromobenzyl)-4-methylquinolinium] [Ni(mnt)2] complex (mnt2 − =maleonitriledithiolate)

A new ion-pair complex, [BrBzMeQl][Ni(mnt)₂] (1) ([BrBzMeQl]⁺?=?1-(4′-bromobenzyl)-2-methylquinolinium; mnt^2??=?maleonitriledithiolate), has been prepared and characterized. X-ray diffraction analysis shows that the Ni(mnt)₂ anion and [BrBzMeQl]⁺ cations of 1 form completely segregated stacking columns, with the Ni?···?Ni distances alternating between 3.717 and 4.466?Å?in the Ni(mnt)₂ stacking column. The variable-temperature magnetic susceptibilities of 1 have been measured over the range 75–300?K and the results reveal that the complex exhibits antiferromagnetic behavior.     

Hydrothermal synthesis,characterization, and luminescence of two new arsenic–vanadium compounds with a γ-[As8V14O42(H2O)]4− anion

Two new compounds, [Zn(phen)₃]₂[γ-As₈V₁₄O₄₂(H₂O)]?·?4H₂O (1) and [Cd(phen)₃]₂[γ-As₈V₁₄O₄₂(H₂O)]?·?2H₂O (2) (phen?=?1,10′-phenanthroline), have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, infrared spectrum, and thermogravimetric analysis. Compound 1 crystallizes in the triclinic space group P 1 with a?=?11.429(4)?Å, b?=?15.760(5)?Å, c?=?15.952(5)?Å, α?=?108.825(5)°, β?=?92.194(5)°, γ?=?104.155(5)°, V?=?2615.6(15)?ų, Z?=?1; 2 crystallizes in the triclinic space group P 1 with a?=?11.450(4)?Å, b?=?15.629(6)?Å, c?=?16.302(6)?Å, α?=?109.177(5)°, β?=?92.628(5)°, γ?=?104.251(4)°, V?=?2644.8(17)?ų, Z?=?1. Single-crystal structural analysis shows that both 1 and 2 consist of a new type of [γ-As₈V₁₄O₄₂(H₂O)]^4? cluster anion.     

Syntheses,urease inhibition activities,and fluorescent properties of transition metal complexes

Four transition metal complexes with Schiff base and 1,10-phenanthroline, [Cu(L)(phen)]₂·C₂H₅OH (1), [Zn(L)(phen)]₂·C₂H₅OH (2), [Ni(L)(phen)]₂·C₂H₅OH (3), and [Co(L)(phen)]₂·C₂H₅OH (4) (H₂L?=?1-((2-hydroxynaphthalen-1-yl)methylene)thiosemicarbazide; phen?=?1,10-phenanthroline) were synthesized and characterized by physico-chemical methods. The crystal structure of 1 was determined by X-ray single-crystal diffraction analysis. 1 crystallizes in the orthorhombic space group Pbca with a?=?15.008(9), b?=?16.100(10), c?=?37.54(2)?Å, V?=?9070(10)?ų, Z?=?8, GOOF?=?1.002, R ₁?=?0.0626, and wR ₂?=?0.0912. The fluorescence and urease inhibitory activities of the compounds were tested. The enzymatic activity study indicated that 3 possessed potent inhibition against jack bean urease, with IC₅₀?=?1.2?±?0.1?μM, and about 35 times more than 42.1?±?0.4 acetohydroxamic acid as positive reference. This suggests that inhibitory efficiency of these complexes can be strongly influenced by different transition metal ions.     

Synthesis and structures of two cobalt complexes [NaCoII(NTA)(H2O)] n and NH4[CoIII(IDA)2] · 2H2O

Two cobalt complexes [NaCo^II(nta)(H₂O)] _n (H₃nta?=?nitrilotriacetic acid) (1) and NH₄[Co^III(ida)₂]?·?2H₂O (H₂ida?=?iminodiacetic acid) (2) have been synthesized and characterized by single-crystal X-ray diffraction analysis. Compound 1 crystallizes in the orthorhombic system, space group P2₁2₁2₁ with a?=?7.9770(12)?Å, b?=?9.7613(15)?Å, c?=?12.1945(18)?Å, V?=?949.5(2)?ų, Z?=?4, and R ₁?=?0.0705 for 1597 observed reflections. Compound 2 crystallizes in the monoclinic system, space group P2(1)/c with a?=?5.1801(3)?Å, b?=?11.2073(6)?Å, c?=?12.2891(7)?Å, V?=?707.09(7)?ų, Z?=?2, and R ₁?=?0.0349 for 1143 observed reflections. In compound 1, the Co is coordinated by a nitrogen and five oxygen atoms in a distorted octahedral geometry {CoNO₅}, and the Na is coordinated by one water molecule and four carboxyl oxygen atoms in slightly distorted square pyramidal geometry. The entire structure shows a three-dimensional network. In compound 2, Co atom is equatorially coordinated by two ida ligands in a distorted octahedral geometry {CoN₂O₄}. The discrete [Co(ida)₂]^2? anions are linked by hydrogen bonding to a three-dimensional supramolecular network.     

Syntheses and structural determination of binuclear nine-coordinate (NH4)4[SmIII2(Httha)2]·16H2O and 2-D ladder-like binuclear nine-coordinate (NH4)4[SmIII2(dtpa)2]·10H2O

Two rare-earth metal coordination compounds, (NH₄)₄[Sm^III₂(Httha)₂]·16H₂O (1) (H₆ttha?=?triethylenetetramine-N,N,N′,N′′,N′′′,N′′′-hexaacetic acid) and (NH₄)₄[Sm^III₂(dtpa)₂]·10H₂O (2) (H₅dtpa?=?diethylenetriamine-N,N,N′,N′′,N′′-pentaacetic acid), have been synthesized through reflux and characterized by FT-IR spectroscopy, thermal analysis, and single-crystal X-ray diffraction techniques. Sm^III of (NH₄)₄[Sm^III₂(Httha)₂]·16H₂O (1) is nine-coordinate, forming tricapped trigonal prismatic coordination with three amine nitrogens and six oxygens, in which four oxygens are from one ttha and two from the other ttha. (NH₄)₄[Sm^III₂(Httha)₂]·16H₂O (1) crystallizes in the monoclinic crystal system with P2(1)/c space group. The crystal data are: a?=?13.9340(13) Å, b?=?22.890(3) Å, c?=?20.708(2) (14) Å, β?=?99.521(2)°, and V?=?6513.7(13) ų. There are two –NH⁺– groups in the [Sm^III₂(Httha)₂]^4?. The polymeric (NH₄)₄[Sm^III₂(dtpa)₂]·10H₂O (2) also is nine-coordinate with tricapped trigonal prismatic conformation and crystallizes in the triclinic crystal system with P–1 space group. The cell dimensions are: a?=?9.8240(8) Å, b?=?10.0329(9) Å, c?=?13.0941(11) Å, β?=?77.1640(10)°, and V?=?1227.30(18) ų. In (NH₄)₄[Sm^III₂(dtpa)₂]·10H₂O, there are two types of ammonium cations, which connect [Sm^III₂(dtpa)₂]^4? and lattice water through hydrogen bonds, leading to a 2-D ladder-like layer structure.     

Synthesis,spectroscopic properties and crystal structure of organophosphoryl polyoxotungstate α-[Bu4N]3H[PhCH2P(O)]2SiW11O39

Reaction of the monovacant heteropolyanions α-[SiW₁₁O₃₉]^8? with PhCH₂PO(OH)₂ leads to the formation of the organophosphoryl derivative α-[Bu₄N]₃H[PhCH₂P(O)]₂SiW₁₁O₃₉ (1). Single-crystal X-ray diffraction analysis shows that the crystal is monoclinic with space group P2₁ /n and the unit cell parameters: a?=?14.386 (3)?Å, b?=?27.015 (5)?Å, c?=?25.480 (5)?Å, α?=?90°, β?=?91.44 (3)°, γ?=?90°, V?=?9899 (3)?ų. Z?=?4, D _c?=?2.467?g?cm^?1, λ (Mo-Kα)?=?0.071073?nm, R ₁?=?0.0638, wR ₂?=?0.1364. The hybrid anion consists of an α-[SiW₁₁O₃₉]^8? framework on which two equivalent organophosphoryl groups are grafted through P?O?W bridges; each of the two PhCH₂P(O) groups are connected to two terminal oxygen atoms belonging to a triad and a diad, respectively.     

Complicated weak interactions in a hybrid material containing tetra(isothiocyanate)cobalt(II) and 1,1′-ethylene-2,2′-dipyridinium: synthesis,crystal structure,and magnetic properties

A new inorganic–organic hybrid material, [EtdiPy][Co(NCS)₄] (1) ([EtdiPy]²⁺?=?1,1′-ethylene-2,2′-dipyridinium), was synthesized and characterized by elemental analysis, IR spectrum, UV-Vis spectrum, ESI-MS, and single-crystal X-ray diffraction. Compound 1 is monoclinic, space group P2₁/n, with a?=?21.691(5)?Å, b?=?8.639(2)?Å, c?=?21.748(5)?Å, β?=?90.124(3)°, V?=?4075.1(16)?ų, D _c?=?1.550?g cm^?3, Z?=?8, F(000)?=?1928, and R ₁?=?0.0435. The C–H···S hydrogen bond, short S···C, S···N interactions, p···π, and π···π interactions observed in the solid state of 1 give a 3-D structure. Magnetic measurements from 2 to 300?K have shown weak antiferromagnetic exchange with θ?=??0.892?K in 1.     

A copper(II) complex with 2-(2′-pyridyl)benzimidazole and l-arginine: synthesis,structure, antibacterial activities,and DNA interaction

A Cu(II) complex with 2-(2′-pyridyl)benzimidazole and l-arginine has been synthesized and investigated by elemental analysis, molar conductivity, IR, UV/vis, and X-ray diffraction. The complex crystallizes in the triclinic space group P1 with six molecules in a unit cell of dimensions a?=?10.6397(5)?Å, b?=?19.2178(8)?Å, c?=?20.0387(9)?Å, α?=?75.3670(10)°, β?=?79.4670(10)°, γ?=?87.4470(10)°, V?=?3897.6(3)?ų, R ₁?=?0.0408, and wR ₂?=?0.0502. The complex contains six crystallographically independent complexes, Cu1, Cu2, Cu3, Cu4, Cu5, and Cu6, which have a distorted square-pyramidal geometry. The complex was screened for its in vitro antibacterial activities against two Gram-positive (Bacillus subtilis and Staphylococcus aureus) and two Gram-negative (Escherichia coli and Salmonella) micro-organisms. The complex exhibited good antibacterial activities against the micro-organisms compared with HPB and Cu(ClO₄)₂. Interaction of the complex with DNA was studied by electronic absorption spectroscopy, fluorescence spectroscopy, circular dichroic spectroscopy, viscosity measurements, and agarose gel electrophoresis. Results suggest that the complex could bind to CT-DNA via partial intercalation, and cleave the plasmid DNA with involvement of hydroxyl radicals, and probably singlet oxygen-like copper-oxo species in the presence of ascorbate.     

Solid state structures of the chiral heterobimetallic complexes [Cu(dach)2][Pt(CN)4] · 2H2O, [Ni(dach)3][Pt(CN)4] · 2DMF · H2O,and [Pd(dach)2][Pt(CN)4] · H2O (dach = 1 R , 2 R -diaminocyclohexane)

The chiral dinuclear heterometallic complexes [Cu(dach)₂][Pt(CN)₄]?·?2H₂O (1), [Ni(dach)₃][Pt(CN)₄]?·?2DMF?·?H₂O (2), and [Pd(dach)₄][Pt(CN)₄]?·?H₂O (3) (dach?=?1R,2R-cyclohexanediamine) have been prepared and characterized by X-ray diffraction analysis. Crystal data: 1, monoclinic, P2₁, a?=?8.108(3), b?=?15.552(6), c?=?9.914(4)?Å, β?=?110.931(6)°, V?=?1167.6(8)?ų, Z?=?2, R ₁?=?0.0420, wR ₂?=?0.1122; 2, monoclinic, P2₁, a?=?13.264(11), b?=?9.285(7), c?=?16.211(13)?Å, β?=?111.640(9)°, V?=?1856(3)?ų, Z?=?2, R ₁?=?0.0276, wR ₂?=?0.0698; 3, monoclinic, P2₁, a?=?6.887(2), b?=?12.809(4), c?=?12.975(4)?Å, β?=?94.865(4)°, V?=?1140.6(6)?ų, Z?=?2, R ₁?=?0.057, wR ₂?=?0.156. In complex 1, the Pt and Cu atoms are linked by a CN bridge that presents a very bent C=N–Cu angle [136.8(8)°].