The crystal structure,magnetism,and colossal magnetoresistance of Y_2CrS_4

Ternary yttrium chromium sulfide,Y2CrS4,prepared by the solid-state reaction of Y2S3,Cr,and S,was found to exhibit an antiferromagnetic transition at about 64 K.The X-ray diffraction pattern at 300 K was refined with space group Pca2 1,and the structure parameters were determined to be a = 12.51 Ab = 7.53A,and c = 12.49A,We investigated the magnetotransport properties,and observed negative colossal magnetoresistance reaching up to 2.5 × 10^ 4 % in the semiconducting compound of Y2CrS4.

Syntheses, Crystal Structures and Magnetism of Two New Coordination Polymers [Ni(bix)_2Cl_2]_n and [Co(bix)Cl_2]_n

The self-assembly reactions of M^ⅡCl2 （M = Ni, Co） with the flexible bix ligand [bix = 1,4-bis（imidazole-1-ylmethyl）benzene] yielded a 2D network [N^Ⅲ（bix）2Cl2]n 1 and a 1D chain [Co^Ⅱ（bix）Cl2]n 2. Their crystal structures have been determined by X-ray single-crystal diffraction analysis. Complex 1 characters a two-dimensional grid-type structure and crystallizes in monoclinic, space group P21/c with a = 7.7231（7）, b = 12.7787（9）, c = 13.9374（13）A, β = 105.419（4）°, C28H28Cl2N8Ni, Mr = 606.19, Ζ = 2, V = 1326.0（2）A^3, Dc = 1.518 g/cm^3, μ = 0.969 mm^-1, F（000） = 628, R = 0.0429 and wR = 0.0783 for 2503 observed reflections （Ⅰ〉 2σ（Ⅰ））. Compound 2 is a one-dimensional chain and crystallizes in orthorhombic, space group Pbca with a = 11.3696（6）, b = 10.2128（6）, c = 14.4943（9） （A）, C14H14Cl2CoN4, Mr = 368.12, Z = 4, V = 1683.01（17）A^3, Dc = 1.453 g/cm^3, μ = 1.334 mm^-1, F（000） = 748, R = 0.0317 and wR = 0.0800 for 1778 observed reflections （Ⅰ〉 2σ（Ⅰ））. Magnetic properties of the title complexes were also investigated.

Syntheses, Crystal Structure and Magnetism of a Hexanuclear Copper(II) Cluster with the Unique Two-parallel Three-site Strings Configuration

Treatment of a heptadentate ligand 2,2＇-（（（pyridine-2,6-diyl-bis（methylene））- bis（（pyridin-2-ylmethyl）azanediyl））bis（methylene））diphenol （H2L） possessing pyridinyl- and phenolate groups, with three equivalents of Cu（C104）2·6H2O in methanol under base conditions, gave rise to a hexanuclear cluster complex [Cu6L2（OH）4]（C104）4·4MeCN·0.5MeOH （1）. Complex 1 crystallizes in triclinic, space group Pi with a = 12.068（12）, b = 12.567（12）, c = 16.279（16） A, α = 105.694（12）, β = 93.631（13）, γ = 112.017（11）°, V= 2166（4） A3, Z = 1,μ= 1.651 mm^-1, Dc = 1.599 Mg/m^3, T = 296（2） K, C74.5H795N14O24.5Cl4Cu6, Mr = 2086.12, F（000） = 1062.5, S = 1.061, R = 0.0521 and wR = 0.1270. In the cation of complex 1, the six copper cores are arranged into a two-parallel three-site strings configuration with each metal exhibits a slightly distorted square-pyramidal geometry, resulting from the connection of donor pyridinyi nitrogen and phenolate oxygen atoms in ligand H2L, and/or the oxygen donors in hydroxyl groups. In addition, magnetic susceptibility measurements revealed complex 1 displayed antiferromagnetic coupling.

A Dinuclear Dysprosium-2-quinolinecarboxylate-1,10-Phenanthroline Compound:Crystal Structure and Magnetism

A dinuclear dysprosium（III） compound,[Dy2（μ2-OH）2（QLC）4（1,10-phen）2]·4H2O（1）（QLC-= 2-quinolinecarboxylate and 1,10-phen = 1,10-phenanthroline）,was synthesized and structurally and magnetically characterized.Compound 1 crystallizes in triclinic system,space group P1 with a = 10.9439（3）,b = 11.2823（3）,c = 12.2323（4） ？,α = 107.446（3）,β = 91.700（3）,γ = 91.511（2）°,V = 1439.25（8） A3,Z = 1,C（64）H（50）N8O（14）Dy2,Mr = 1480.12,Dc = 1.708 g/cm3,μ = 2.653 mm-1 and F（000） = 734.The final R = 0.0366 and w R = 0.0736 for 5816 observed reflections with I 〉 2σ（I）.Compound 1 contains the mononuclear [Dy（QLC）2（1,10-phen）] subunit formed from one 1,10-phen and two QLC-ligands chelating Dy（III） ion.Two mononuclear [Dy（QLC）2（1,10-phen）] subunits are bridged by a pair of μ2-OH groups to give a centrosymmetric dinuclear [Dy2（μ2-OH）2（QLC）4（1,10-phen）2] with each Dy（III） ion being eight-coordinated.Detailed susceptibility measurements revealed that compound 1 does not show slow magnetic relaxation under zero direct-current field but exhibits field-induced slow magnetic relaxation under 2 kOe applied field.

Synthesis, crystal structure and magnetic properties of novel copper compound Cu(phen)(m-CBA)_2

A novel compound Cu（phen）（m-CBA）2 was synthesized with m-chlorobenzoic acid（m-CBA）, 1,10-phenanthroline（phen） and Cu（OAc）2·H2O. It was characterized by IR, UV, elemental analyses and X-ray crystallography. It crystallizes in the monoclinic crystal system with C2/c space group, a=2.9699（4） nm, b=1.15452（2） nm, c=1.5335（2） nm, β=111.118（2）°, V=4.905 1（1） nm3, Z=8, F（000）=2 328, R1=0.072 8, wR2=0.223 4 [I2σ（I）]. Structure analysis shows that the copper center coordinates with two nitrogen atoms from one 1,10-phenanthroline molecule, two oxygen atoms from two m-chlorobenzoic acid molecules, giving a distorted squared planar coordination geometry. This novel compound shows paramagnetic interactions between copper centers.

Synthesis, Crystal Structure, and Magnetic Properties of a New Dinuclear Iron Complex with Schiff Base Ligand

A new dinuclear iron（Ill） complex has been synthesized and structurally charac- terized by X-ray crystallography： [Fem2（L）（C6HsCOO）（SO4）（CH3OH）2]·CH3CN＇CH3OH （1, H3L = N,N＇-bis（salicylidene）q,3-diamino-2-propanol）. Complex 1 belongs to orthorhombic space group Pna21 with a= 11.4400（8）, b = 22.9705（2）, c = 12.5712（9）A, V= 3303.5（4）A3, Z= 4, F（000） = 1576, Dc= 1.531 g·cm-3, Mr= 761.36,μ = 1.007 mm-1, S = 1.014, the final R= 0.0505 and wR= 0.1018. The crystal packing is stabilized by intermolecular O-H…O hydrogen bonds, forming an extended one-dimensional chain structure. The temperature dependence of magnetic susceptibility measurement shows that antiferromagnetic interaction is propagated between the metal centers. Fit as dinuclear arrangement gave parameters ofJ= 19.7 cm-1, g = 1.89 and R2 = 0.9999.

Co Content Dependence of Crystal Structure and Specific Magnetization of Fe_(1-x)Co_x-SiO_2 Granules Prepared by Sol-Gel Method

The Co content dependence of crystal structure and specific magnetization of Fe1-xCox-SiO2granular solid prepared by the sol-gel method have been studied. It is found that the crystal structure, Iattice parameter and specific magnetization of the FeCo alloy particles depend on the Co content.

Single and Double Chainlike Manganese Coordination Polymers of Linear Ligands: Synthesis, Structure and Magnetism

Two single and double chain manganese coordination polymers {[Mn(L1)(H_2O)_2]NO_3}_n(1) and [Mn(L2)_2(H_2O)]_n(2)(HL1 = 2,2?:6?,2??-terpyridine-4?-carboxylic acid, HL2 = 4?-(4-carboxyphenyl)-2,2?:6?,2??-terpyridine) have been synthesized hydrothermally, and characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Compound 1 crystallizes in monoclinic space group P2/c, while 2 crystallizes in triclinic, space group P1. Crystal data for 1: C_(16)H_(14)MnN_4O_7, Mr = 429.25, a = 10.684(2), b = 9.338(1), c = 9.896(2) ?, β = 113.89(3)o, V = 902.7(3) ?~3, Z = 2, T = 153(2) K, Dc = 1.579 g/cm^3, μ = 0.780 mm-1, F(000) = 438, R = 0.1084, wR = 0.3507, and GOF = 1.069; For 2: C44 H30 MnN6 O5, Mr = 777.68, a = 11.255(2), b = 11.554(2), c = 15.417(3) ?, α = 107.28(3), β = 101.07(3), γ = 107.23(3)o, V = 1740.2(6) ?~3, Z = 2, T = 293(2) K, Dc = 1.484 g/cm3, μ = 0.440 mm^(-1), F(000) = 802, R = 0.0471, wR = 0.1050, and GOF = 0.948. In both compounds, the central Mn(Ⅱ) ions adopt the same distorted pentagonal-bipyramid geometry [MnN_3O_4] with different secondary structure units. L1 ligand adopts the μ_2-1κ~3N,N?,N??:2κ~2O,O? mode to coordinate with mononuclear manganese to build a single chainlike compound 1, while L2 employs μ_3-1κ~3N,N?,N??:2κ~2O,O?:3κ~1O and 1κ~1O modes to link dimeric Mn_2O_2 to exhibit a double chainlike 2. Both compounds display weak antiferromagnetic coupling interactions.

Hydrothermal Synthesis, Crystal Structure and Magnetic Property of a Novel Mixed Valence Decatungstate: [Cu(2,2′-bipy)_2]_2Na_2W_6~VW4^(VI)O_(30)·2H_2O

A novel Cu（II）-2,2＇-bipy-supported （bipy = bipyridine） mixed valence decatungstate, [Cu（2,2＇-bipy）2]2Na2W6^VW4^VIO30·2H2O 1, has been synthesized and structurally characterized by X-ray analysis. The crystal of 1 is of triclinic, space group P1^- with a= 10.9393（10）, b = 12.0492（2）, c = 12.3783（2）A, a = 80.631（10）, β= 70.226（10）, γ= 72.329（9）^o, V = 1459.64（4）A^3, Z = 1, Dc = 3.582 g/cm^3, F（000） = 1404, R = 0.0553 and wR = 0.1242 for 4607 observed reflections （I 〉 2σ（I））. The EPR spectrum of 1 indicates that its unpaired electrons are placed in the dx2-y2 orbital of the ground state of Cun. Furthermore, compound 1 shows an antiferromagnetic interaction.

Synthesis, Crystal Structure and Magnetic Properties of a New Zn(II)-Nitronyl Nitroxide Complex

A new complex [Zn（NIT-1′-MeBzlm）Cl2（H2O）] （NIT-1′-MeBzlm = 2-{2′-[（1′- methyl）benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide） has been prepared and structurally characterized by X-ray diffraction method. Crystal data： monoclinic, space group P21/n, Z = 4, C15H21Cl2N4O3Zn, Mr = 441.63, a = 7.2225（10）, b = 30.849（4）, c = 8.8758（13）A, β = 103.904（2）°, V = 1919.6（5）A^3, Dc = 1.528 g/cm^3, μ（MoKα） = 1.579 mm^-1, F（000） = 908, R = 0.0436 and wR = 0.1029 for 2456 observed reflections with I〉 2σ（I）. X-ray analysis reveals that the Zn（Ⅱ） ion is four-coordinated with a distorted tetrahedron. There also exist H-bonds, π-π piling interactions and weak intermolecular contacts between the NO groups which form a mutual stagger 3-D network configuration. Magnetic investigation reveals that there exists intermolecular antiferro- and ferromagnetic interactions in the title complex.

Two [Ni(dmit)_2]^- Compounds Showing Layered and Chain Alignments: Crystal Structures and Magnetic Properties

Two metal-dithiolene compounds with a formula of[4-ClBz-l-APy][Ni（dmit）2]（1）and[4-NO2Bz-l-APy][Ni（dmit）2]（2,4-ClBz-1-APy = 1-N-（4＇-chlorobenzyl）pyridinium,4-NO2Bz-1-APy = l-N-（4＇-nitrobenzyl）pyridinium,dmit^（2-）= 1,3-dithiole-2-thione-4,5-dithiolate） were synthesized and characterized.Two compounds crystallize in triclinic space group P1 and P1,respectively,but with different cell parameters and packing structures.The[Ni（dmit）2]^- anions and cations of 1 form mixed column stacks along the a axis and alternately layered alignments in the crystal of 2,which are parallel to the crystallographic（110） plane.Two compounds show a similar magnetic behavior,the magnetic exchange natures are mainly antiferromagnetic,and the magnetic susceptibility data can be fitted to the simple Curie-Weiss law.For 1 and 2,the fitted Curie constants are much less than the spin-only value expected for an S =1/2 system,and the fitted Weiss constants marking magnetic interaction are also very smaller.This fact implies that the weak CurrieWeiss-type paramagnetism is not the intrinsic characteristics of two compounds.

Syntheses and Crystal Structures of Two CopperⅡ Complexes with TetracyanonickelateⅡ

Two copper-nickel complexes, {[Cu（i-Pr3TACN）][Ni（CN）4]}2·2H2O （1） and {[Cu（DACH）][Ni（CN）4]}n （2）, have been synthesized by the self-assembly reactions of K2[Ni（CN）4] with CuCl2 and the corresponding chelating ligand 1,4,7-triisopropyl-1,4,7- triazacyclononane （i-Pr3TACN） or 1,4-diazacycloheptane （DACH）, respectively. The complexes were structurally characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra and magnetic properties. Complex 1 presents a [2＋2] type of molecular square structure and 2 features a 2D β-pucker structure. The magnetic susceptibility measurements reveal a weak antiferromagnetic interaction between the Cu（Ⅱ） ions, with the J values of–22.11 and –32.50 cm-1 for 1 and 2. Moreover, by changing the size of macrocyclic ligands we have successfully constructed two different strictures, which may provide useful information for the construction of the structure.

Synthesis, Crystal Structure and Magnetic Properties of a One-dimensional Loop-like Iron(Ⅱ) Complex:[Fe(Haip)_2(H_2O)_2]_n (Haip = 5-Ammoniumisophthalato)

An iron（Ⅱ） coordination polymer, [Fe（Haip）2（H2O）2]n （1, Haip = 5-ammoniumiso- phthalato）, has been hydro/solvothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectrum and magnetic measurement. Compound 1 crystalizes in monoclinic, space group P2/c with a = 6.9874（14）, b = 9.960（2）, c = 12.894（4） A, β = 117.47（2）°, Fe（C8H6NO4）2（H2O）2, Mr = 452.16, V= 796.2（3） A3, Z = 2, Dc = 1.886 g.cm-3, p = 1.017 mm-1, F（000） = 464.0, 2.71〈0〈28.42°, R = 0.0307, wR = 0.0840 and S = 1.005. Single-crystal X-ray diffraction analysis reveals that 1 features an infinite one-dimensional loop-like chain structure and Haip ligand in 1 is of zwitterionic form. Magnetic measurement results show the dominated ferromagnetic interactions among Fe11 atoms.

Synthesis, Crystal Structure and Magnetic Properties of a Cobalt(Ⅱ) Complex with Quinoxaline-substituted Nitronyl Nitroxide Radicals

A new complex with the formula [Co（acac）_2（NITQ）_2]×2CH_2Cl_2 1（acac = acetylacetone, NITQ = 2-（2′-quinoxalinyl）-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide）, was synthesized and elucidated structurally as well as magnetically in detail. The crystal belongs to the monoclinic system, space group P2_1/c with a = 9.6896（1）, b = 20.539（4）, c = 12.147（2） ？, β = 93.84（3）°, M_r = 997.65, V = 2412.1（8） ？~3, Z = 2, Dc = 1.374 g/cm, F（000） = 1038, m = 0.635 mm^（-1）, the final R = 0.0539 and w R = 0.1289 for 5998 observed reflections（I 〉 2σ（I））. The Co（Ⅱ） ion is coordinated by two nitrogen atoms of quinoxaline rings from two NITQs and four oxygen atoms from two acac ions to complete a distorted octahedral coordination environment. Compound 1 is further linked into a three-dimensional（3D） supramolecular network by hydrogen-bonding, Cl×××O weak contact and π···π stacking interactions. The magnetic measurements show compound 1 exhibits weak ferromagnetic interactions.

Synthesis, Crystal Structure and Magnetic Property of the Polymeric Ribbon: [Co(ip)(phen)]_n

A metal-organic coordination polymer [Co(ip)(phen)]n (ip = isophthalate, phen = 1,10-phenanthroline) 1 has been hydrothermally synthesized and characterized. Compound 1 crystallizes in P2/c space group with a = 8.37(2), b = 10.41(1), c = 18.36(3) ?, β = 100.41(7)o, C20H12CoN2O4, Mr = 403.25, V = 1573(4) ?3, Z = 4 and Dc = 1.703 g/cm3. Two Co(II) ions are bridged by μ-carboxylate to form a dinuclear unit, which is extended by ip ligands resulting in a ribbon-like chain. Pairs of phen ligands attach to the dinuclear units on both sides of the chain alternately. Magnetic study reveals that the interaction between the carboxylate-bridged Co(II) ions in 1 is weakly antiferromagnetic.

Synthesis, Magnetic Property and Crystal Structure of a Ytterbium-Copper Mixed Metal Complex:Yb_2Cu_3L_6·6H_2O (L=O(CH_2COO)_2)

Reaction of hydrated ytterbium nitrate and copper nitrate with diglycolic acid at pH= 7 produced a new Yb-Cu mixed metal complex, Yb2Cu3L6. 6H2O(L= O(CH2COO)2). Complex Yb2Cu3O36C2H36 (Mr= 1437. 23) crystallized in hexagonalP6/mcc (No. 192) with cell parameters of a= 14. 344 (3), c= 15. 470(7) A,V= 2757(2) A 3; Z= 2; F(000) = 1390; Dcalc.= 1- 731 g/cm3 μ(MoKa) =45. 8 cm-1. The final agreernent factors are R= 0. 077 and Rw = 0.089 for 867 observed reflections with I>3δ(I). It has been characterized by elemental analysis, IR spectrum, magnetic measurement and X-ray crystallography. In the complex, the Yb3+ ion is 9-coordinated tothree ether oxygen and six carboxylate oxygen atoms from three ligands, the copper ionis coordinated to four oxygen atoms from four carboxylate groups of four ligands andtwo water molecules. The Yb3+ ions and the Cu2+ ions are connected by the carboxylate groups of the ligands, thus resulting in the formation of the complicated networkstructure.

Synthesis, Crystal Structure and Magnetic Property of Disodium Biscarbonato cobaltate(Ⅱ) Tetrahydrate, Na_2Co(CO_3)_2·4H_2O

The title compound, Na 2Co(CO 3) 2·4H 2O, was synthesized by dropwise addition of 1.0 mL of 1 mol/L Co(CH 3COO) 2 to 50 mL of aqueous solution containing 7.0 g(66.0 mmol) of Na 2CO 3 and 2.5 g(29.8 mmol) of NaHCO 3 under stirring. A rose colored rhombohedral crystal grew by the slow evaporation of the solution of the title compoud at room temperature. The crystal structure was established on the basis of the single crystal X ray diffraction data. Na 2Co(CO 3) 2·4H 2O crystallizes in the monoclinic space group C2/c with a =0.856 6(1) nm, b =0.714 6(1) nm, c = 1 438 7(2) nm, β =97.59(1)° , V =0.873 0(2) nm 3 , D x=2.260 g/cm 3, F (000)=596, M r=296 99, μ (Mo K α)=21.06 cm -1 , Z =4 and the final R(F) =0.032 and wR(F 2) =0.068 on the basis of 947 reflections ( F 2 ≥ 2σ(F 0 2)). The crystal consists of H 2O molecules, Na + ions and 2D 2 ∞[Co(CO 3) 2] 2- layers extending parallel to (001). H 2O molecules and Na + cations are located between the 2D layers. Each Co atom is tetrahedrally coordinated by four O atoms from four CO 2- 3 groups with d (Co\_O)=0.206 5(2) nm, 0.207 6(2) nm and the angle of O\_Co\_O is in the range of 97.7(1)°—128.5(1)°. The CO 2- 3 group bridging two Co atoms via two O atoms deviates from D 3h symmetry with d (C\_O)=0.127 2(3)\_0.129 9(3) nm and the angle of O\_C\_O is in the range of 119.5(2)°\_123.4(2)°. Each Na atom, with two close Na neighbours at 0.338 4(2) nm and 0 346 7(2) nm, respectively, is octahedrally coordinated by six O atoms from four H 2O molecules and two carbonate groups belonging to two layers with d (Na\_O)=0.232 7(2)\_0.241 1(2) nm. Of two crystallographically different H 2O molecules, one forms hydrogen bonds to two CO 3 2- groups of one 2D layer, and the other to those from two different 2D layers. Na 2Co(CO 3) 2·4H 2O is antiferromagnetic below 16 K, and between 30\_300 K its magnetic behaviour obeys Curie Weiss law χ m(cm 3·mol -1 )=2.625/( T -12.1) with μ eff =4.5 B.M. at 298 K.

Synthesis, Crystal Structure and Magnetic Properties of Cobalt(II) Complex Involving Imino Nitroxide Radicals

A novel compound [Co(IM2-Py)2(NO3)]?(NO3) (IM2-Py = 2-(2?-pyridyl)-4,4,5,5- tetramethylimidazoline-1-oxyl) has been prepared and structurally characterized by X-ray diffrac- tion method. It crystallizes in orthorhombic, space group P212121 with a = 11.031(2), b = 13.492(3), c = 20.467(4) ?, V = 3046.0(11) ?3, C24H32CoN8O8, Mr = 619.51, Z = 4, Dc = 1.351 g/cm3, μ(MoKα) = 0.620 mm?1, F(000) = 1292, R = 0.0506 and wR = 0.0845 for 3752 observed reflections with I > 2σ(I). X-ray analysis reveals that the crystal structure consists of [Co(IM2- Py)2(NO3)]+ moiety and a NO3 anion. The cobalt(II) ion is six-coordinated with a distorted octahedral geometry. Tempera- ? ture dependence of susceptibility measurements show that there exist an antiferromagnetic inter- action in the compound.

Two Coordination Polymers Based on the Flexible N-Substituted 2,2'-Biimidazole Ligand: Solvothermal Synthesis, Crystal Structures and Characterizations

Two new supramolecular complexes, [Cu2（Pra2biim）2（H2O）2].2H20 （1） and[Mn（Pra2biim）（H2O）E]n （2） （HEPraEbiim = 1,1′-di（propionic acid）-2,2′-biimidazole） have beenprepared and structurally characterized by thermogravimetric analysis, elemental analysis, IRspectra and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals thatcomplex 1 crystallizes in the triclinic, space group P1 with a = 8.403, b=9.60970（10）, c =10.5681（2） A, V= 736.272（16） A3, Z= 1, Dc = 1.695 g/cm^3, F（000） = 386, GOOF = 1.156, R（I〉20（/）） = 0.0396 and wR （I 〉 20（/）） = 0.1060, and exhibits a dinuclear structure formed by theconnection of Cu^2＋ ions with two bridging Pra2biim2 ligands. Complex 2 crystallizes in themonoclinic, space group Pc with a = 9.058（4）, b = 5.2745（16）, c = 17.591（7） A, V= 733.2（5） A3, Z= 2, Dc=1.663 g/cm^3, F（000） = 378, GOOF = 1.060, R（I〉 2σ（I）） = 0.0885 and wR（1 〉 2σ（I）） =0.2199, and the Pra2biim2 ligands link Mn^2＋ ions to a 63 2D sheet structure. The Pra2biim2′ ligandshows two different types of coordination modes. Moreover, hydrogen bonds further stabilize the3D supramolecular architecture. The magnetic behavior in the temperature range （2-300 K）reveals weaker antiferromagnetic interactions between the Cu2＋ ions in 1.

Two New Copper(Ⅱ) Complexes with p-Cyanobenzoic Acid: Synthesis, Crystal Structures and Properties

The complexes of [Cu（bpy）（H2O）（CBA）2]n 1 and [Cu（phen）（H2O）（CBA）2]·H2O 2 based on p-cyanobenzoic acid （HCBA） have been synthesized in aqueous ethanolic solution at room temperature. The single-crystal X-ray diffraction studies demonstrated that complex 1 crystallizes in orthorhombic and complex 2 is of triclinic system. The results indicate the complex 1 shows a 1D chain structure bridged bytwo carboxylic oxygen atoms from CBA–, and complex 2 is a mononuclear structure. Through intermolecular hydrogen bonding and π···π stacking interactions, the complexes are assembled into supramolecular structures.Complex 1 has been characterized by magnetic measurements. Themagnetic measurement indicates that weak ferromagnetic interaction （zJ＇ = 0.038（5）） between the Cu^2＋ ions is dominant in the structure. The IR spectrum and results of thermal and elemental analyses are also presented.