Synthesis and Crystal Structure of DinuclearCadmium Complex [Cd2（phen）4（fca）2]（ClO4）2-（H2O）2

1 INTRODUCTION During the search of molecule-based materials with interesting properties such as catalysis, cla- thration etc., much attention has been focused on the synthesis of one-, two- and three-dimensional extended solids involving cadmium[1], as its d10 configuration permits a wide variety of geometries and coordination numbers. Rigid bridged ligands such as carboxylate groups are frequently used to construct these materials. Therefore, the coordi- nation chemistry of Cd(Ⅱ) ca…     

Synthesis and Crystal Structure of Cadmium（Ⅱ） Complex [Cd（H2O）（CH3OC6H4COO）2]n

1 INTRODUCTION Cadmium (Ⅱ) complexes have been exten- sively studied from both chemical and structural views, mainly due to the capability of cadmium (Ⅱ) (shared by most d10 metal ions) to adopt different modes of coordination determined by the consideration of size, as well as electrostatic and covalent bonding forces[1]. And the field of coordination polymers has witnessed tremendous growth over the last decade[2]. Many coordination polymeric networks have been shown to posses intere…     

Synthesis and Structural Characterization of [Mn（phen）2（H2O）2]（OAc）2.6H2O

1 INTRODUCTION Water oxidation to oxygen gas by photo- synthetic apparatus of green plants and cyano- bacteria is the origin of this gas in the atmosphere. The water oxidation center is a tetranuclear, oxide- bridged manganese cluster with O,N-based peri- pheral ligation by amino acid side-chain group[1, 2]. The binding of aqua to the Mn site may be impor- tant to the oxidation of aqua for producing dioxygen. 1,10-Phenanthroline has been adopted to simulate coordination sphere of manga…     

Preparation, Crystal Structure and Thermal Behaviour of a One-dimensional Coordination Polymer [Mn（m-CPOAH）2（H2O）2]n

1 INTRODUCTION Supramolecular chemistry of manganese(II) car- boxylate coordination polymers has been inten- sively studied in recent years, within which ligand design is an important aspect in adjusting the coordi- nation framework and functionalities of the complexes formed[1～4]. Carboxyphenoxyacetic acids (CPOAH2), which have been known to show biological activities and are widely used in agriculture, are a family of multidentate flexible ligands with versatile binding abilities. …     

Synthesis, Crystal Structure, UV-vis and EPR Studies of（ NH3CH2CH2NH2 ） 2.5 [ Mo0.5^（V）W0.5^（VI）O2 （ OC6H4O ） 2]

Cis-dioxo-metal complex ( NH3CH2CH2NH2 ) 2.5 [ Mo0.5^(V)W0.5^(VI)O2 ( OC6H4O ) 2] 1 was obtained by the reaction of tetra-butyl ammonium hexamolybdotungstate with 1, 2-dihydroxybenzene in the mixed solvent of CH3OH, CH3CN and ethylenediamine,and characterized by X-ray diffraction, UV-vis and EPR analysis. Compared with its analogous complexes (NH3CH2CH2NH2)3[Mo^(V)O2(OC6H40)2] 2 and (NH3CH2CH2NH2)2[W^(VI)O2(OC6H4O)2] 3, the results show that tungsten(VI) is less active in redox than molybdenum (VI) and that the change of the valence induced by substitution of W(VI) for Mo(V) in EMO2(OC6H40)2]n- does not influence the coordination geometry of the complex anion in which the metal center exhibits distorted octahedral coordination with cis-dioxo catechol. The responses to EPR of complexes 1 and 2 are active but complex 3 is silent,and the UV-vis spectra exhibited by the three complexes are obvious different because of the different electronic configuration between the central Mo(V) and W(VI) ions in the complexes.It is noteworthy that complexes 1 and 2 have the similar EPR signal to flavoenzyme, suggesting that the three complexes have the same coordination geometry feature with the co-factor of flavoenzyme.     

Synthesis and Crystal Structure of Mn（phen）（PhCOO）2（H2O）

1 INTRODUCTION During the last decade the manganese che- mistry has aroused great interest due to its diverse redox functions of enzymes in photosystem Ⅱ and its specially structural, magnetic and spectroscopic properties[1, 2]. A lot of manganese complexes involving carboxylate ligands have been reported, and their properties been fully explored[3, 4]. The coordination environment of the manganese site in biosystem often consists of oxygen and nitrogen atoms from the carboxylate groups…     

Synthesis, Crystal Structure and Electrochemical Properties of the Complex Cd（α-FRA）2（Phen）（H2O）

1 INTRODUCTION The syntheses and structures of carboxyl complex- es have captured the interest of chemists for years due to their potential applications in many fields, such as materials, medicine, molecular electro-che- mistry and biochemistry[1～3]. So far, to the best of our knowledge, cadmium complexes with aromatic carboxylic acid as ligands have been intensively studied[4～7], but those with heterocyclic carboxylic acid as ligands are much less. α-Furoic acid is widely used in orga…     

Crystal Structure and Thermal Decomposition Mechanism of [K（DNP）（H2O）0.5]n

Introduction As developing high-energy, low toxicity and envi-ronment friendly primary explosive has been becoming a new and important investigation field, much attention has been paid to nitrogen-rich potassium coordination compounds for the sake of their low toxicity and little pollutions.1-11 In order to make good use of potassium compounds, the reaction of 2,4-dinitrophenol (DNP) and potassium hydroxide was designed, and the title compound potassium 2,4-dinitrophenate (KDNP) was obtained…     

Synthesis and Structure of [Cu（OH）2（H2O）2（4—C5H4N—COOH）2]

1 INTRODUCTION Supramolecular chemistry and crystal engineering of coordination compounds have attracted considerable interests nowadays owing to the fascinating structural diversity and potential applications as functional materials[1,2]. Generally, architectures of supramolecules are formed through hydrogen bonds, ?- ?stacking interaction or other weak interactions between the molecules. Recently, many supramolecular compounds containing silver(I) and copper(II) species have been re-…     

Crystal Structure,Electrochemical and Fluorescent Properties of a New Cadmium（II） Complex [Cd（C12H6O4N2）（Phen）2（H2O）]·3H2O

A new Cd（II） complex [Cd（C12H6OaN2）（Phen）ffH2O）]＇3H2O with 2,2＂-bipyridine- 3,3＂-dicarboxylic acid as a ligand has been synthesized. Crystal data for the title complex are as follows： monoclinic, space group P2dn, a = 12.8458（5）, b = 17.9131（7）, c = 15.2960（6） A, β = 111.7430（10）°, V = 3269.3（2） A3, Dc = 1.581 g/cm3, Z = 4,/a（MoKa） = 0.731 mm-1, F（000） = 1580, the R = 0.0244 and wR = 0.0605. In the title complex, the central Cd（ll） ion is located in a distorted octahedral coordination environment. The electrochemical and fluorescent properties of the title complex were studied. The results show that the electron transfer of the title complex is irreversible in the electrode reaction and it has a broad emission peak in the range of 470-508 nm with the excitation wavelength of 488 nm.     

Synthesis, Crystal Structure and Luminescent Property of a Novel 1-D Cadmium(Ⅱ) Complex: [Cd2(C8H3NO6)2(H2O)4]n·2nH2O

A novel one-dimensional chain-like coordination polymer constructed from 3-nitrobenzene-1,2-dicarboxylic acid, [Cd2(C8H3NO6)2(H2O)4]n·2nH2O, has been synthesized and its structure was determined by X-ray crystallography method. The crystal belongs to monoclinic, space group P21/c with a = 6.1252(8), b = 20.706(3), c = 8.8067(11) (A), β = 95.608(2)°, V= 1111.6(2)(A)3, Mr =751.12, Dc = 2.244 g/cm3, F(000) = 736, μ = 2.011 mm-1, Z = 2, the final R = 0.0262 and wR = 0.0692for 2338 observed reflections with I ＞ 2σ(I). The structure of the title compound presents a 1-D chain-like structure constructed by dimer units, [Cd2(CsH3NO6)2(H2O)4]n, through two carboxylate oxygen atoms. The fluorescence of the tifle compound has been also discussed in this paper.     

Syntheses,Crystal Structures and Properties of Three New Complexes [Ni（C9N2O2H7）2（CH3OH）2],[Zn（C9N2O2H7）2（H2O）2] and [Cd（C9N2O2H7）2（CH3OH）2]

Three novel metal-organic complexes with formulas [Ni(C9N2O2H7)2(CH3OH)2](1),[Zn(C9N2O2H7)2(H2O)2](2) and [Cd(C9N2O2H7)2(CH3OH)2](3) were synthesized by the reactions of Ni,Zn and Cd salts with ethyl 2-benzimidazolylacetate under hydrothermal conditions or layering technique,and characterized by single-crystal X-ray diffraction analysis,IR spec-troscopy,solid-state luminescent properties and thermogravimetric(TG) analysis.The crystal data for these three complexes are as follows:for 1,monoclinic,space group P21/c,a = 9.384(3),b = 9.634(3),c = 11.292(3) ,β = 95.787(5)°,V = 1015.7(5) 3,Z = 2,F(000) = 492,Dc = 1.547 Kg/m3,μ = 1.002 mm-1,the final R = 0.0451 and wR = 0.0900 for 1833 observed reflections with Ⅰ 2σ(Ⅰ);for 2,orthorhombic,space group Pbca,a = 10.031(4),b = 10.379(4),c = 17.525(7),V = 1824.6(12) 3,Z = 4,F(000) = 928,Dc = 1.645 Kg/m3,μ = 1.392 mm-1,the final R = 0.0452 and wR = 0.0996 for 1661 observed reflections with Ⅰ 2σ(Ⅰ);for 3,monoclinic,space group P21/c,a = 9.9114(13),b =10.4852(15),c = 10.4120(14) ,β = 108.453(5)°,V = 1026.4(2) 3,Z = 2,F(000) = 532,Dc = 1.705 Kg/m3,μ = 1.110 mm-1,the final R = 0.0322 and wR = 0.0805 for 1822 observed reflections with Ⅰ 2σ(Ⅰ).In the three complexes,the ethyl 2-benzimidazolylacetate shows the same chelating mode,and the adjacent units are interlinked into a two-dimensional layer through hydrogen-bonds(O-H···O,N-H···O).     

Synthesis and Crystal Structure of a Three-dimensional Cd(II) Coordination Polymer [Cd(μ_(1,3)-SCN)(μ_3-pco)]_n(pco=Pyrazine-2-carboxylate 4-oxide Anion)

1 INTRODUCTION For a long time much research interest has been focused on coordination polymeric compounds[1] because these new coordination polymers may afford new materials with useful properties, such as catalytic activity, micro-porosity, electrical conduc- tivity, non-linear optical activity, magnetic coupling behavior and so on[2]. Thiocyanate anion is a very useful bridging ligand, and many complexes[3～5] are synthesized with it as bridging ligand and some of them exhibit interesti…     

Synthesis and Crystal Structure of One-dimensional Cadmium(II) Coordination Polymer: [Cd_2(DTB)(Bpy)_2(H_2O)_2]n (DTB = 1,4-Dinitro-2,3,5,6-tetracarboxylatebenzene Tetravalent Anion; Bpy = 2,2''''-Bipyridyl)

1 INTRODUCTION Much research interest has been focused on thecoordination polymers for a long time because theymay afford new materials with useful properties,such as catalytic activity, microporosity, electricalconductivity, non-linear optical activit…     

Synthesis and Crystal Structure of [{Cd(hmbdc)(H2O)3}·2H2O]n

A novel coordination polymer [{Cd(hmbdc)(H2O)3}·2H2O]n (hmbdc=5-hydroxy- isophthalic acid) has been synthesized and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group P21/c, with a=9.599(3), b=18.699(5), c=7.557(2) (A), β= 108.198(4)°, V=1288.6(6) (A)3, Z=4, Mr=382.60, Dc=1.972 g/cm3, F(000)=760, μ=1.740, the final R=0.0555 and wR=0.0995 for 1732 observed reflections with Ⅰ ＞ 2σ(Ⅰ). The structural analysis shows that the intermolecular hydrogen bonds and π-π interactions result in a three-dimensional supramolecular framework.     

Hydrothermal Synthesis and Crystal Structure of a Cadmium(Ⅱ) Polymer with One-dimensional Chain Structure: [Cd(MDPPz)(BDC)(H2O)]n

A metal-organic coordination compound formulated as [Cd(MDPPz)(BDC)(H2O)]n 1 (MDPPz = 11-methyldipyrido[3,2-a:2',3'-c]phenazine, BDC = 1,4-benzenedicarboxylate) has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, fluorescence spectrum and single-crystal X-ray diffraction. The title compound crystallizes in the monoclinic system, space group C2/c, with a = 30.673(8), b = 9.623(3), c = 20.784(6) (A), β = 98.646(3)o, V = 6065(3) (A)3, C27H17CdN4O5, Mr = 589.85, Dc = 1.292 g/cm3, μ(MoKα) = 0.757 mm(1, F(000) = 2360, Z = 8, the final R = 0.0381 and wR = 0.0855 for 4191 observed reflections (I＞2σ(I)). 1 exhibits blue fluorescence property at room temperature.     

Synthesis and Crystal Structure of a New One-dimensional Double Helical-chain Polymer, {Zn（O2CC12H8CO2）（H2O）}n

1 INTRODUCTION Pronounced interest has been put in the field of coordination polymeric complexes owing to their fas- cinating molecular topologies[1～3] along with poten- tial applications as functional materials[4～6]. In par- ticular, complexes with helical structures attract much attention of scientists[7, 8] mainly due to their simi- larity to the structure of DNA molecule. To obtain new complexes, solv- and hydrothermal routes are currently used. In this way, the organic ligand act…     

Synthesis and Crystal Structure of a Three-dimensional Cd(Ⅱ) Coordination Polymer [Cd(μ1,3-SCN)(μ3-pco)]n (pco = Pyrazine-2-carboxylate 4-oxide Anion)

The three-dimensional complex [Cd(μ1,3-SCN)(μ3-pco)]n has been synthesized with μ1,3-SCN- and pco as mixed bridged ligands. The crystal belongs to monoclinic, space group P21/n with a = 10.3777(16), b = 6.2592(9), c = 13.150(2) (A), β= 97.317(2)°, V=847.2(2) (A)3, Z= 4,C6H3CdN3O3S, Mr = 309.575, Dc = 2.427 g/cm3, F(000) = 592 and μ = 2.804 mm-1. The structure was refined to R = 0.0255 and wR = 0.0550 for 1712 observed reflections (I＞2σ(I)). In the crystal the Cd(Ⅱ) ions are coordinated by μ1,3-SCN- and μ3-pco bridge ligands to form a three-dimensional structure.     

Synthesis and Crystal Structure of a Novel Zinc Complex[Zn(OH2)(HDPA)2]·3H2O

A new complex [Zn(OH2)(HDPA)2]·3H2O 1 (H2DPA = 2,6-pyridine-dicarboxylic acid) has been prepared at room temperature from the reaction of zinc(II) chloride and 2,6-pyri- dine-dicarboxylic acid in mixed solvent of H2O and EtOH with pyridine, and characterized by X-ray analysis and thermal analysis, exhibiting that the coordination geometry of Zn(II) ion is an octa- hedron. Crystal data: ZnC14H16N2O12, Mr = 469.66, monoclinic, P21/n, a = 7.0067(3), b = 23.8215 (12), c = 10.7404(3)(A), β = 99.823(2)°,V = 1766.40(13)(A)3, Z = 4, Dc = 1.766 g/cm3, F(000) = 960, μ = 1.463 mm-1, R1 = 0.0462 and wR2 = 0.0884 (I > 2σ(I)).