Synthesis and Crystal Structure of a Novel Polymeric Thiocyanato-Bridged Heteronuclear Complex of Copper(II) and Cadmium(II)

The title polymeric complex of Cu(II) and Cd(II) bridged by thiocyanate, Cu(en)₂[Cd(SCN)₃]₂, has been prepared and its structure determined by X-ray diffraction (XRD) methods. The crystal structure reveals that the Cu(II) atom is in an elongated octahedral coordination formed by two SCN^– anions and two en molecules. The Cd(II) atom is in a distorted octahedral coordination formed by six bridging SCN^– anions. Two different bridging thiocyanate anions exist in the complex. Both 1,1--SCN^– and 1,3--SCN^– anion act a role of bridge ligand and link Cu(II), Cd(II) atoms, and adjacent Cd(II). Cd(II) atoms form the three-dimensional (3-D) network polymeric structure. The IR and UV-Vis spectra have also been investigated.     

Synthesis,crystal structure and luminescence of three europium complexes with 2-iodobenzoic acid

Three new complexes, [Eu(2-IBA)₃?·?H₂O] _n (1), [Eu(2-IBA)₃?·?2,2′-bpy]₂ (2), and [Eu(2-IBA)₃?·phen]₂ (3) (2-IBA?=?2-iodobenzoato; 2,2′-bpy?=?2,2’-bipyridine; phen?=?1,10-phenanthroline) were synthesized, and their crystal structures determined by X-ray diffraction. In complex 1, Eu³⁺ ions are linked through carboxylate groups via bridging – chelating – bridging coordination modes to form a one-dimensional polymeric chain. The carboxylate groups are tetradentate-bridged. Complex 2 is binuclear with an inversion center, in which europium is nine-coordinated with seven oxygen atoms from five 2-IBA ligands and two nitrogen atoms from one 2,2′-bpy molecule in a distorted monocapped square antiprism. The crystal structure of 3 is similar to that of 2. These complexes emit red light luminescence. The ⁵ D ₀?→?⁷ F _j (j?=?1–4) transition emission of Eu³⁺ ion has been observed.     

Synthesis and Crystal Structure of a Polymeric Benzimidazole Complex of Mn(II) Bridged by Succinate

The title complex has been prepared and its crystal structure determined by X-ray diffraction methods. The Mn (II) complex is seven coordinate with two benzimidazole (bimid)ligands in axial positions and two succinate and one bimid ligands in the equatorial plane. The succinate bridges Mn (II) atoms to form polymeric chains, linked by intermolecular H-bonding. Free bimid molecules occur in the crystal structure; they link Mn (II) complexes with H-bonds involving N atoms. Aromatic stacking between bimid rings is observed, resulting in a gauche confirmation of succinate in the structure. The IR spectrum is assigned based on the crystal structure. The difference of 139cm^-1 between symmetric and asymmetric stretching vibrations of carboxyl groups is in line with seven coordination at the Mn (II) atom.     

Synthesis and Crystal Structure of a New Silver(I) Complex

The reaction of 4-amino-6-methyl-1,2,4-triazine-3(2 H)-thione-5-one (AMTTO) with silver(I) nitrate in methanol gives the complex [Ag(AMTTO)₂]NO₃ ( 1 ). 1 was characterized by IR and ¹³C NMR spectroscopy and by an X-ray structure analysis [space group C2/c, Z = 4, lattice dimensions at –80 °C: a = 1306.7(2), b = 1139.0(2), c = 1089.2(1) pm, β = 94.54(1)°, R₁ = 0.0294]. The cation possesses a highly distorted linear coordination sphere in the solid state.     

Eu(BA)3phen的晶体结构和荧光光谱

标题配合物晶体属三斜晶系，Ｐ１空间群，晶胞参数ａ＝１０７９２（２）ｎｍ，ｂ＝１１８９６（２）ｎｍ，ｃ＝１２４４６ｎｍ，α＝１０５１２（３）°，β＝９３７６（３）°，γ＝１１３１９（３）°，Ｖ＝１３９２（１）ｎｍ－３，Ｚ＝２，Ｄｘ＝１６５９ｇ·ｃｍ－３。配合物晶体由双核分子组成，两个中心Ｅｕ３＋通过羧基桥联，它们的化学环境相同。Ｅｕ３＋的配位数为８，其配位多面体为一畸变的四方反棱柱体。在７７Ｋ配合物的荧光光谱说明配合物中仅存在一种Ｅｕ３＋格位。     

Synthesis and Luminescence Study of Europium Complexes with Carboxylic Acid and 1,10-Phenanthroline Ligands

A series of euroPium(Ⅱ)eomPlexes with earboxylie aeids andl,10-Phenantl飞ro-line:Eu(L):·pllen·jHoO,wl:ereL-formate,3-hydroxy-4-metlloxybenzoate,4一metl、oxybenzoate,4一ehloroPhenoxyaeetate,and diPI、enylaeetate,were synthesizedand el、araeterized by elemental analysis,UV sPeetrum,IR speetrum and melting point.IR da亡a eonfirmed tllat euroPium 15 eoordinated wirh 0 donor atoms in earboxy!ie aeidand N donor atoms inl,10一phenanthroline.A strong ligand一loealized absorption at270 nm!ed to a series of meta!一eentered emission bands between 580 and 710 nm as-signedto ~5D_0-7F_(0.1.2.3.)     

Synthesis and Crystal Structure of a Cadmium Complex with Isonicotinate

The cadmium(II) complex, [Cd(iso) 2 (H 2 O) 4 ] (where iso is the anion of isonicotinic acid), has been synthesized and characterized by element analysis, thermal analysis and IR spectroscopy. An X-ray crystal structure reveals that the cadmium ion is trans -octahedral with two pyridyl nitrogens and two aqua oxygens in equational positions and two aqua oxygens in axial positions. The complex forms a three-dimensional network through intermolecular hydrogen bonds.     

Hydrothermal Synthesis and Crystal Structure of a Three-dimensional Cadmium（II） Complex

A metal-organic coordination polymer [Cd2(PDC)2(bix)(H2O)2]n ·nH2O(H2PDC=2,4-pyridinedicarboxylic acid, bix=1,4-bis(imidazol-1-ylmethyl)-benzene) 1 has been hydrothermally synthesized and characterized by elemental analysis, IR, TG, fluorescence spectrum and single-crystal X-ray diffraction. Brown crystals crystallize in the orthorhombic system, space group P2 12 12 1 with a=11.741(3), b=14.190(4), c=18.963(5) , V=3159.4(14) 3 , C28H26Cd2N6O11, Mr=847.35, Dc=1.781 g/cm3 , F(000)=1680, Z=4, μ(MoKα)=1.415 mm 1 , the final R=0.0381 and wR=0.0882 for 5472 observed reflections (I >2σ(I)). The structure of 1 exhibits a threedimensional network structure.     

Synthesis,Crystal Structure and Fluorescence of A 1-D Polymeric Zinc(Ii) Complex with Pyrazine-2-Carboxylate as a Bridging Ligand

A one-dimensional chain complex {[Zn(pyz)(SCN)(H₂O)₂]·H₂O}_∞ (pyz = pyrazine-2-carboxylic anion) has been synthesized and its crystal structure determined by X-ray crystallography. The complex crystallizes in an orthorhombic system and the space group is P2 ₁2₁2₁ with a = 6.873(3), b = 9.847(4), c = 16.466(7) Å. The Zn(II) ion is located in a distorted octahedral environment with two oxygen atoms O(3) and O(4) from terminal ligands of two water molecules, another oxygen atom O(1) from the carboxylate group of pyz, and three nitrogen atoms, N(1), and N(2A) from two different pyz and N(3) from a terminal thiocyanate anion, in which a chelated five-membered ring is formed by coordination of O(1) and N(1) to the Zn(1) atom. Therefore, an infinite zigzag chain consisting of Zn(II) ions and pyz anions is constructed and the chains are linked together with hydrogen bonding from coordinated and uncoordinated water molecules. The fluorescence spectra for the bridging ligand Na(pyz) and the complex were measured at room temperature in aqueous solution and in the solid state.     

Synthesis and Crystal Structure of a Fumaratocopper(II) Complex with Bipyridine

The title complex [Cu₂(C₄H₂O₄)₂(bipy)₂(H₂O)₃] · 3H₂O (bipy = 2,2'-bipyridine) was prepared and its crystal structure determined by X-ray diffraction methods. Both Cu(II) atoms of the binuclear complex assume square pyramidal coordination. The fumarate groups display different coordination modes. One fumarate group bridges two Cu(II) ions to form a binuclear complex while another fumarate group terminally coordinates to a Cu(II) atom with one carboxyl group free from coordination. The terminally coordinated fumarate showed unusual disorder, which may be due to an intermolecular H-bonding interaction. Close stacking of bipy rings is observed as verified by the distance of 3.46 Å between parallel ring planes. IR spectra were assigned based on the molecular structure.     

Synthesis,Characterization and Crystal Structure of a Nickel(II) Schiff Base Complex Derived from Acetylacetone and Ethylenediamine

The square-planar nickel (II) complex of composition [Ni(bae)]·½H₂O (1) [where H₂bae is bis(acetylacetone)ethylenediamine] has been synthesized by [2 + 1] template condensation of acetylacetone and ethylenediamine in the presence of NiCl₂·6H₂O and characterized. An X-ray structure determination of the complex has been completed. Average Ni-N and Ni-O distances are, respectively, 1.86(2) Å and 1.849(14) Å. N···N bite distance and bite angle are 2.627(6) Å and 87.2(2)°, respectively, for the five-membered chelate ring. The water molecule forms hydrogen bonds with O atoms of two complex molecules.     

钕钇异核谷氨酸配合物的合成及晶体结构

在水溶液中合成发钕钇异核谷氨酸配合物［（Ｎｄ４／３Ｙ２／３（Ｇｌｕ）２（Ｈ２Ｏ）８）４］（ＣｌＯ４）１６．１０Ｈ２Ｏ的单晶，并测定其结构。晶体属单斜晶系，Ｐ２１空间群，晶胞参数：ａ＝１．１０３７（５）ｎｍ，ｂ＝１．６７１０（５）ｎｍ，ｃ＝２．００８６（１０）ｎｍ，β＝１０２．８０（４）°，Ｖ＝３．６１２（３）ｎｍ＾３，Ｚ＝１，Ｄｃ＝２．０７９ｇ／ｃｍ＾３。最终偏差因子Ｒ＝０．０５８。钕和钇对中心位     

SCN-桥联的一维链配位聚合物[Cd(dafo)(SCN)2]n的合成及晶体结构

A new one-dimensional compound [Cd(dafo)(SCN)₂]_n(dafo=4,5-diazafluoren-9-one) has been synthesized and characterized by single crystal X-ray diffraction. It crystallizes in the orthorhombic system; space group Pbca with a=1.708 6(5), b=1.303 6(4), c=2.592 6(8) nm, V=5.775(3) nm³, and Z=16. The crystal structure revealed that the structure of [Cd(dafo)(SCN)₂]_n features μ-1,3-thiocyante bridges and 1D chains. It consists of octahedrally coordinated Cd atoms. Both Cd(1) and Cd(2) are surrounded by two nitrogen atoms from dafo, two S atoms and two N atoms from two di-μ-1,3 thiocyanato bridges. CCDC: 251185.     

三(3-羟基黄酮)合铝(Ⅲ)的合成及晶体结构

合成了三(3-羟基黄酮)合铝(Ⅲ),制得[Al(C₁₅H₉O₃)₃]₂·2CHCl₃·8H₂O晶体,X射线衍射结果表明:其结构属于三方晶系,空间群为R3.晶胞参数:a=b=1.6558(3)nm,c=3.6465(20)nm,α=β=90°,γ=120°,V=8.65608(0.00586)nm₃,D_c=1.45g/cm³,μ(MoKα)=3.20cm^-1,F(000)=3924.分子中每个3-羟基黄酮以其独特的酮基和羟基同时与Al³⁺配位,3个配体中的6个配位氧原子形成扭曲的配位八面体.     

Synthesis and Crystal Structure of an Mn(II) Complex with Benzoylacetone

The complex (benzoato)benzoylacetonato(bipyridine)Mn(II) has been prepared and its crystal structure determined by X-ray diffraction methods. Benzoic acid, benzoylacetone (bzac) and 2,2'-bipyridine all chelate to Mn(II) to form a six coordinate complex. As bond angles around the Mn(II) atom greatly deviate from those expected for an octahedron, the coordination geometry may be described as distorted pyramidal with a bidentate carboxyl group occupying the apex of the pyramid. Although the Mn atom deviates by 0.550 Å from the enol ring plane of bzac, Mn-O distances [2.105(2) and 2.098(2) Å] are normal. This suggests the existence of electrostatic interactions between Mn(II) and the bzac ligand.     

Synthesis and Crystal Structure of Bis（tetra－hydrofurfurylcyclopentadienyl）ytterbium Chloride

ＳｙｎｔｈｅｓｉｓａｎｄＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＢｉｓ（ｔｅｔｒａ－ｈｙｄｒｏｆｕｒｆｕｒｙｌｃｙｃｌｏｐｅｎｔａｄｉｅｎｙｌ）ｙｔｔｅｒｂｉｕｍＣｈｌｏｒｉｄｅＺＨＵＡＮＧＸｉｕ－ｌｉ;ＺＨＡＮＧＳｕｏ－ｂｏ;ＨＵＮｉｎｇ－ｈａｉａｎｄ...     

Synthesis and Crystal Structure of a 1,3-Benzenedicarboxylatomanganese(II) Complex with 2,2-Bipyridine

The title complex has been prepared by the reaction of Mn(2,2'-bipy)Cl 2 with 1,3-benzenedicarboxylate (BDC) in ethanol solution. The complex crystallizes in space group C 2/ c with a =13.847(6), b =15.629(7), c =17.106(6) Å, g =107.90(3)° and z =8. Three BDC and one bipy ligands coordinate to Mn(II) to form a distorted octahedron. Each BDC bridges three Mn(II) atoms to form a polymeric chain. It is notable that although the Mn(II) atom deviates 1.084 Å from the bridging carboxyl plane it still has a normal coordination distance of 2.141(2) Å. This might suggest an electrostatic interaction between Mn(II) and carboxyl O atoms in the title complex. The IR spectrum is discussed, based on the molecular structure.     

Synthesis and Crystal Structure ofa Seven—coordinate Cadmium（Ⅱ）Complex

1 INTRODUCTION In the last decade, there has been great interest in the crystal engineering of supramolecular architectures organized by coordinate covalent bonds, hydrogen bonds and their combination owing to their fascinating structural diversity and potential applications as functional materials[1~3]. The self-assembly of coordinate polymers and supramolecules is highly influenced by factors such as ligands, metal ions, the counter ions, solvent, template, reaction temperature, pH va…