Hydrothermal Synthesis and Crystal Structure of a 1D Cu（II） Coordination Polymer： [Cu（bbpy）（H_2bptc）]_n Constructed by a Tetracarboxylic Acid

The title compound [Cu(bbpy)(H2bptc)]n (bbpy = 4,4'-dimethyl-2,2'-bipyridine and H4bptc = 1,1'-biphenyl-2,2?,3,3'-tetracarboxylic acid) has been synthesized by hydrothermal reaction, and its structure was determined by X-ray diffraction and characterized by elemental analysis, IR spectrum and thermogravimetric analysis. The crystal is of triclinic, space group P1 with a = 11.2831(12), b = 11.6718(13), c = 11.7771(13), α = 105.392(2), β = 108.382(2), γ = 112.397(2)o, CuC28H20N2O8, Mr = 576.00, V = 1222.4(2)3, Dc = 1.565 g/cm3, F(000) = 590, μ = 0.951 mm-1, S = 1.022 and Z = 2. The final refinement gave R = 0.0405 and wR = 0.1142 for 4270 observed reflections with I > 2σ(I). The title complex has a 1D [Cu(bbpy)(H2bptc)]n chain structure, in which the extensive hydrogen-bond interactions make the chain more stable. The neighboring parallel chains are further packed into a 2D layer structure via π···π stacking interaction between the pyridine rings of bbpy ligands. Moreover, the adjacent layers are interconnected by the C-H···π interactions to form a 3D metal-organic framework.     

Hydrothermal Synthesis,Crystal Structure and Magnetic Property of a New Co（Ⅱ） Complex：[Co（4,4＇-bpy）_2（H_2O）_2（4-FBA）_2]·（4,4＇-bpy）

A new complex [Co(4,4'-bpy)2(H2O)2(4-FBA)2]·(4,4'-bpy)(1) has been hydro-thermally synthesized using cobalt,4,4'-bipyridyl(4,4'-bpy) and 4-fluorobenzoic acid(4-HFBA),and characterized by thermal analysis,single-crystal X-ray diffraction and magnetic property.The complex crystallizes in the triclinic system,space group P,Z = 1.Crystal data:C54H44CoF2N8O6,Mr = 997.90,a = 9.134(2),b = 11.555(2),c = 12.867(3) ,α = 66.02(3),β = 77.96(3),= 73.11(3)°,V = 1180.9(4) 3,Dc = 1.403 g/cm3,μ(MoKα) = 0.433 mm-1,F(000) = 517,the final R = 0.0633 and wR = 0.1171 for 2152 observed reflections(I > 2σ(I)).The title complex is assembled into 1D supramolecular chains parallel to [001] based on the adjacent molecular ··· stacking interactions and hydrogen bonds.The variable temperature magnetic measurements show a weak ferromagnetic behavior over 300-160 K followed by antiferromagnetic behavior below 160 K for the title complex.     

Hybrid Tungstocuprate [Cu(2,2'-bpy)3]2H4[CuW12O40]·6H2O Based on Keggin Polyoxoanion [CuW12O40]6-with CuⅡas Heteroatom

A novel hybrid tungstocuprate(Ⅱ) [Cu(2,2'-bpy)3]2H4[CuW12O40]·6H2O(2,2'-bpy=2,2'-bipyridine) was synthesized via hydrothermal method and characterized using elemental analyses, IR, UV, XPS, TG-DSC, EPR, and X-ray single crystal diffraction. The structural analysis shows that the complex consists of an unusual Keggin-type polyoxoanion [CuW12O40]6- and a pair of chiral complex cations [Cu(2,2'-bpy)3] together with four protons and six crystallization water molecules, and the Keggin polyoxoanion is connected with [Cu(2,2'-bpy)3] via multiple C-H…O hydrogen bonds resulting in a dimer.     

A New Cadmium（Ⅱ） Coordination Polymer Incorporating a 3D Framework with 1D Channels Bridged by Flexible Cyclohexane-1,2,4,5-tetracarboxylate Ligand

The hydrothermal reaction of Cd(OAc)2·2H2O, 4,4'-bpy and cyclohexane-1,2,4,5-tetracarboxylic acid (H4L) yields a three-dimensional (3D) coordination porous framework [Cd2LI(4,4'-bpy)1.5(H2O)2]n·2nH2O, which was characterized by single-crystal X-ray diffraction (MoKα radiation, λ = 0.71073), elemental analysis and IR. This complex crystallizes in the monoclinic system, space group C2/c with a = 25.951(3), b = 11.6618(12), c = 20.046(2) , β = 114.863(2)o, V = 5504.4(10) 3, Z = 8, Dc = 1.900 g/cm3, Mr = 787.30, μ = 1.615 mm-1, F(000) = 3128, the final R = 0.0978 and wR = 0.1780. The structure of the complex is a 3D coordination Cd-carboxylate framework consisting of 1D hexagonal channels along the c-axis filled with the bridging 4,4'-bpy ligands. The 4,4'-bpy ligands with two kinds of conformations are located alternately in the channels through coordination and hydrogen interactions to support the whole porous framework, in which the conformation-flexible cyclohexane-1,2,4,5-tetracarboxylate ligand adopts the I (e,a,a,e) conformation and acts as a pentadentate ligand to connect five Cd(Ⅱ) atoms via the carboxylate groups in different coordination modes.     

Synthesis and Crystal Structure of an Infinite Sandwich-type Cu（I） Coordination Polymer： {[Cu（abpy）_2]（H_3bptc）·（H_2O）}_n Constructed by a Tetracarboxylic Acid

The title compound {[Cu(abpy)2](H3bptc)·(H2O)}n, an ion-pair complex of [Cu(abpy)2]+ with [(H3bptc)]- (abpy = 3,3'-dimethyl-2,2'-bipyridine and H4bptc = 1,1'-biphenyl-2,2',3,3'-tetracarboxylic acid), has been synthesized by a hydrothermal reaction, and its structure was deter- mined by X-ray diffraction and characterized by elemental analysis and IR spectrum. The crystal is of triclinic, space group P1 with a = 8.4955(12), b = 15.164(2), c = 15.303(2), α = 105.704(3), β = 97.374(3), γ = 96.764(3)o, CuC40H35N4O9, Mr = 779.26, V = 1857.9(4)3, Dc = 1.393 g/cm3, F(000) = 808, μ = 0.649 mm-1, S = 1.026 and Z = 2. The final R = 0.0493 and wR = 0.1034 for 4026 observed reflections with I > 2σ(I). The copper(I) coordination polymer demonstrates a 3-D sandwich-type structure containing 2-D double H3bptc-chain layers intercalated with the [Cu(abpy)2]+ layers by extensive hydrogen bonding interactions.     

Syntheses,Structures,and Properties of Two New Coordination Polymers Based on Tetracarboxylate and 2,2′-Bipyridine Mixed Ligands

Two new coordination polymers {[Zn2L1(2,2'-bpy)2(H2O)2]·4H2O}n(1) and [Zn2L2(2,2'-bpy)2(H2O)2]n(2)(H4L1 = terphenyl-2,2',4,4'-tetracarboxylic acid, H4L2 = quarterphenyl-2,2',4,4'-tetracarboxylic acid, and 2,2'-bpy = 2,2'-bipyridine) have been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction studies. Complex 1 displays 2D wavelike networks, which are further joined together through O–H···O hydrogen bonds to give a 3D supramolecular network. Complex 2 exhibits 1D ladder-like chains, and they are further joined together by π-π stacking and O–H···O hydrogen bonding interactions to form a 3D supramolecular network. The results indicate that the backbone of carboxylate ligands has significant effects on the formation and structure of the resulting functional coordination polymers. Additionally, thermal stability and photoluminescent properties of 1 and 2 are also investigated in detail.     

Hydrothermal Synthesis and Crystal Structure of a Manganese(II) Coordination Polymer with 1,1′-Biphenyl-2,2′,6,6′-tetracarboxyl Acid and 2,2′:6,2′′-Terpyridine Ligands

The title compound {[Mn(H2BPTC)(tpy)(H2O)]·(H2O)3}n (1, H4BPTC = 1,1′- biphenyl-2,2′,6,6′-tetracarboxylic acid, tby = 2,2′:6,2′′-terpyridine) has been synthesized by the hydrothermal reaction, and its structure was determined by X-ray diffraction and characterized by elemental analysis, IR spectrum and thermogravimetric analysis. The crystal is of monoclinic, space group P21/c with a = 10.971(2), b = 20.776(4), c = 14.332(3) , β = 109.25(3)o, MnC31H27N3O12, Mr = 688.50, V = 3084.1(10) 3, Dc = 1.483 g/cm3, F(000) = 1420, μ = 0.498 mm-1, S = 1.066 and Z = 4. The final refinement gave R = 0.0447 and wR = 0.1103 for 5107 observed reflections with I > 2σ(I). The title complex has a {[Mn(H2BPTC)(tpy)(H2O)]}n chain structure, and the hydrogen bonding interactions make it more stable. Each chain is further connected to the adjacent ones through π···π, C-H···π and rich hydrogen bonds to form a metal-organic coordination polymer.     

Hydrothermal Synthesis and Crystal Structure of a Cadmium(II) Polymer with One-dimensional Chain Structure: [Cd(bpy)(BDC)]_n·nbpy

A metal-organic coordination polymer [Cd(bpy)(BDC)]n·nbpy (bpy = 2,2-bipyri- dine, H2BDC = terephthalic acid) has been hydrothermally synthesized and structurally characteri- zed by elemental analysis, IR spectrum, TG and single-crystal X-ray diffraction. The complex crystallizes in monoclinic, space group C2/c with a = 15.723(5), b = 21.695(5), c = 7.576(5) , β = 116.171(7)o, V = 2319.3(18) 3, C28H20CdN4O4, Mr = 588.88, Dc = 1.686 g/cm3, μ(MoKα) = 0.987 mm-1, F(000) = 1184, Z = 4, the final R = 0.0464 and wR = 0.0831 for 1882 observed reflections (I > 2σ(I)). It exhibits a three-dimensional network with channels constructed from one-dimensional coordination chains via C–H···O hydrogen bonds and significant aromatic π-π stacking interactions.     

Syntheses,Crystal Structures and Properties of Co（Ⅱ） and Cu（Ⅱ） Complexes with 5-Nitro-1,2,3-benzenetricarboxylic Acid

Two new coordination polymers,{[Co(O2N-Hbtb)(phen)(H2O)3]·2H2O}n 1 and {[Cu3(O2N-btb)2(bipy)2(H2O)4]·4H2O}n 2(O2N-H3btb=5-nitro-1,2,3-benzenetricarboxylic acid,phen=1,10-phenanthroline,bipy=2,2'-bipyridine),were prepared through hydrothermal reactions of Co(Ⅱ) or Cu(Ⅱ) salt with O2N-H3btb in the presence of different auxiliary N-donor ligands.Their crystal structures were determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis and IR spectroscopy.In the two complexes,O2N-H3btb ligand acts as monodentate and bis-monodentate modes,respectively.Complex 1 displays a two-dimensional layered structure through the inter-and intramolecular hydrogen bonding interactions while complex 2 has an O2N-btb bridged one-dimensional chain which is extended into a three-dimensional network by hydrogen bonding interactions.The magnetic properties of complex 2 are investigated over the temperature range of 2～300 K and ferromagnetic interactions are observed.     

Syntheses and Crystal Structures of Two Co(II) Coordination Polymers with 4,4''''-(Hexafluoroisopropylidene)bis(benzoic acid)

Two new one-dimensional zigzag chain coordination polymers,[Co(hfipbb)(2,2'-bpy)(H2O)2]n 1 and [Co(hfipbb)(1,10-phen)(H2O)]n 2,have been synthesized under hydrother-mal reactions from CoCl2.6H2O,4,4'-(hexafluoroisopropylidene)bis(benzoic acid) and 2,2' -bipyridine or 1,10-phenanthroline ligands,respectively. Single-crystal X-ray analyses revealed that the zigzag chains of 1 and 2 are linked into three-dimensional supramolecular networks by both O-H···O hydrogen-bonds and π···π stacking interactions. Crystal data for 1:C27H20CoF6N2O6,Mr=641.38,orthorhombic,space group Pnna,a=9.3820(19),b=27.366(6),c=10.106(2) ,V=2594.8(9) 3,Z=4,Dc=1.642 g/cm3,F(000)=1300,μ=0.752 mm-1,R=0.0311 and wR=0.0924. Crystal data for 2:C29H18CoF6N2O5,Mr=647.38,monoclinic,space group P21/n,a=7.7626(16),b=29.446(6),c=11.281(2) ,β=93.98(3)°,V=2572.3(9) 3,Z=4,Dc=1.672 g/cm3,F(000)=1308,μ=0.757 mm-1,R=0.0403 and wR=0.0820.     

Synthesis,Structure and Magnetic Property of a Binuclear Nickel(Ⅱ) Complex

A new binuclear complex [Ni2(2,2'-bpy)2(C8H3NO6)2(H2O)4] 1 (2,2'-bpy = 2,2'- bipyridine, C8H3NO6 = 4-nitrophthalate) has been synthesized by a hydrothermal reaction and characterized by X-ray single-crystal diffraction analysis. The complex crystallizes in triclinic, space group P1 with a = 7.206(2), b = 10.337(4), c = 12.480(4) , α = 89.887(11), β = 77.033(9), γ = 78.349(6)o, V = 886.3(5) 3, Z = 1, C36H30Ni2N6O16, Mr = 920.08, Dc = 1.724 g cm-3, F(000) = 472, μ = 1.152 mm-1, the final R = 0.0458 and wR = 0.1163 for 3372 observed reflections with I 2σ(Ⅰ). The two Ni(Ⅱ) ions are bridged by two 4-nitrophthalates both in a bis-monodentate mode. Magnetic measurements reveal that the intramolecular exchange couplings in the dimer are ferromagnetic with 2J/k = 2.32 K, D =-1.44 K and g = 2.18.     

A 2D Lanthanide-organic Framework Based on Inorganic Lanthanum（Ⅲ） Sulfate Skeletons：Synthesis,Structure,and Luminescence and Thermal Properties

A new lanthanum coordination polymer formulated as {[La2(pyda) 2(μ4-SO4) ·5H2O]· 2H2O}n(1,H2pyda = 2,6-pyridine-dicarboxylic acid) has been synthesized from the reaction of H2pyda with lanthanide nitrate in the presence of sulfate as a counter anion. The compound was characterized by elemental analysis,IR spectroscopy and X-ray single-crystal diffraction. It crystallizes in the orthorhombic system,space group Pna21,with a = 18.8558(19) ,b = 6.5831(7) and c = 18.7543(19) . The compound is a 2D hybrid,in which the La(Ⅲ) ions were doubly connected by the carboxylic group of pyda2-ligand to form the La(Ⅲ) dimer followed by being grafted into 1D zig-zag chains which are further connected into a 2D network containing {[La(SO4) ]+}n helical chains. The interchain hydrogen bonding and π-π stacking interactions extended the 2D networks into a 3D supramolecular edifice.     

Dinuclear Copper（Ⅱ） Complex with a New Polycarboxylate Ligand：Syntheses,Characterization and Crystal Structure

A dinuclear copper(Ⅱ) complex,[Cu2(HL)2(H2O)6] 1(H3L = 2,4,6-tri(3-carboxy-phenylthio)-1,3,5-triazine),was synthesized hydrothermally and characterized by single-crystal X-ray diffraction,IR and thermal analysis.Single-crystal X-ray diffraction reveals that complex 1 is a dinuclear copper(Ⅱ) complex,which is further extended to a 3D network by weak interactions such as O…H-O hydrogen bonds and noncovalent S...S interactions.The crystal of compound 1 belongs to monoclinic,space group C2/c,with a = 50.15(2),b = 6.789(3),c =15.667(8) ,β = 90.588(9)o,V = 5334(4) 3,Z = 4,C48H38Cu2N6O18S6,Mr = 1306.28,Dc = 1.627 g/cm3,F(000) = 2664,Rint = 0.0631,T = 293(2) K,μ = 1.112 mm-1,the final R = 0.0661 and wR = 0.1850 for 3782 observed reflections with I > 2σ(I).     

Synthesis,Crystal Structure and Characterization of a New Mixed-valence Cu（Ⅰ）/Cu（Ⅱ） Complex [Cu（bipy）（Me2dtc）CuI2]n

A new one-dimensional mixed-valence Cu(Ⅰ)/Cu(Ⅱ) complex [Cu(bipy)(Me2dtc)CuI2]n 1 (bipy = 2,2′-bipyridine and Me2dtc = N,N-dimethyldithiocarbamate) has been synthesized under solution condition, and characterized by elemental analysis, IR spectrum, single-crystal X-ray diffraction and magnetic property. The crystal belongs to the tetragonal system, space group P4122 with a = b = 11.6504(16), c = 13.466(3) , V = 1827.8(5) 3, Z = 4, Dc = 2.389 g/cm3, Mr = 657.27, λ(MoKa) = 0.71073 , μ = 5.931 mm·1, F(000) = 1236, the final R = 0.0483 and wR = 0.1245. A total of 2102 unique reflections were collected, of which 2009 with I > 2σ(I) were observed. 1 consists of polymeric [CuII2]nnanions and [CuII(bipy)(Me2dtc)]+ cations. It is interesting that the cations of 1 interact through π-π stacking interactions after rotating 90° to form one-dimensional chains parallel to the anion chains. The magnetic study indicates antiferromagnetic behavior for this complex.     

Synthesis and Crystal Structure of the Binuclear Complex:[Cu_2(phen)_2(ip)(Hip)_2]·4H_2O

A binuclear complex [Cu2(phen)2(ip)(Hip)2]·4H2O has been synthesized by the reaction of Cu(CH3COO)2·H2O, phen(1,10-phenanthroline) and isophthalic acid (H2ip) under hydrothermal condition. Elemental analysis, IR spectra and X-ray single-crystal diffraction were carried out to determine the composition and crystal structure. Crystal data for this complex: mono- clinic, space group C2/c, a = 19.214(3), b = 10.6973(14), c = 22.567(3) , β = 105.081(2)°, C24H19N2O8Cu, Mr = 526.95, Z = 8, F(000) = 2160, V = 4478.6(10) 3, Dc = 1.563 g/cm3, μ = 1.030 mm-1, –24≤h≤16, –13≤k≤13, –28≤l≤28, R = 0.0369 and wR = 0.0819 for 4615 (Rint = 1.0357) independent reflections and 3290 observed ones (I > 2σ(I)). Structural analysis shows that coordination geometry of Cu(Ⅱ) is a planar square, and the title complex exhibits a 2-D framework supramolecular structure by hydrogen bonds and π-π stacking interactions.     

Synthesis,Structure and Characterization of [Cu(2,2′-bpy)_2][{Cu(2,2′-bpy)_2}_2W_(12)O_(40)(H_2)]·4H_2O

An organic-inorganic compound [Cu(2,2′-bpy)2][{Cu(2,2′-bpy)2}2W12O40(H2)]·4H2O (Mr = 4048.00) was prepared from the hydrothermal reaction of Na2WO4·2H2O, CuCl2·2H2O, 2,2′-bipyridine (2,2′-bpy) and H2O at 160 ℃ for 4 days. The compound crystallizes in the monoclinic system, space group P21/n with a = 18.9196(8), b = 20.4212(8), c = 21.8129(9) , β = 96.992(3)°, V = 8365.0(6) 3, Dc = 3.214 g/cm3, Z = 4, μ(MoKα) = 17.269 mm-1 and F(000) = 7324. Of the 119837 total reflections, 17315 were unique (Rint = 0.0489). The final R = 0.0385 and wR = 0.0770 for 11142 observed reflections with I > 2σ(I). Single-crystal X-ray diffraction reveals that the structure is composed of [{Cu(2,2′-bpy)2}2W12O40(H2)]2- anions, discrete [Cu(2,2′-bpy)2]2+ cations and lattice water molecules, and the anion is made up of a {W12O40(H2)}6- α-Keggin core decorated with two {Cu(2,2′-bpy)2}2+ groups through bridging oxygen atoms.     

Synthesis and Crystal Structure of a 2-D Hydrogen-bonded Supramolecular Network {[Cu_4(OH)_4(2,2'-bpy)_4(bqdc)]·2ClO_4}_n

The title compound {[Cu4(OH)4(2,2'-bpy)4(bqdc)]·2ClO4}n 1 (bqdc = 2,2'-biquino- line-4,4'-dicarboxylic acid) has been synthesized by hydrothermal method. Its crystal structure is of triclinic, space group P1 with a = 7.6561(5), b = 12.4652(8), c = 15.7501(10) , α = 80.0480(10), β = 87.7900(10), γ = 74.0800(1)o, V = 1423.65(16) 3, Z = 2, C30H23ClN5O8Cu2, Mr = 744.06, Dc = 1.736 g/cm3, μ = 1.651 mm─1, F(000) = 754, the final R = 0.0421 and wR = 0.1163 for 4973 observed reflections with I > 2σ(I). In 1, tetra-copper chair-like clusters of [Cu4(OH)4(2,2'-bpy)4]4+ are connected by bqdc ligands to form one-dimensional chains, which are further connected by hydrogen bonds to generate a two-dimensional supramolecular network .     

Synthesis,Structure, and Luminescent and Dielectric Properties of a Novel 1D Chain Zinc(Ⅱ) Complex {[Zn(DCImPyO)·(H_2O)_2·]·H_3O}_n

Under hydrothermal conditions, 4-(4,5-dicarboxy-1H-imidazol-2-yl)pyridine 1-oxide (H3DCImPyO) reacted with ZnCl2 to give the 1D chain complex {[Zn(DCImPyO)·(H2O)2·]·H3O}n (1). Single-crystal X-ray determination shows that complex 1 crystallizes in the monoclinic system, space group P2 1 /c with a=9.488(2), b=13.247(3), c=12.959(4) , β=126.716(19)°, Z=4, V=1305.6(6) 3 , C10H11N3O8Zn, D c=1.865 g/cm3 , M r=366.61, λ(MoKa)=0.71073 , μ=1.930 mm -1 , F(000)=744, R=0.0472 and wR=0.1487. Fluorescent analysis showed an intense emission band at 422 nm when the exciting radiation was set at 378 nm. Dielectric constant of complex 1 was measured at different frequencies with temperature variation.     

Synthesis,Crystal Structure and Properties of a Nanotubular Metal-organic Framework（MOFs） Based on Cu（Ⅱ） Oxide Chains and Benzenedicarboxylates

A new cooper benzenedicarboxylate metal-organic coordination polymer,[Cu(μH2O)(BDC)]n·nDMF(1,H2BDC = 1,4-benzenedicarboxylate acid,DMF = N,N'-dimethylfor-mamide),has been successfully synthesized under hydrothermal conditions and characterized by IR spectroscopy,elemental analysis,thermogravimetric analysis and single-crystal X-ray diffraction.This complex crystallizes in triclinic,space group P1 with a = 6.605,b = 10.44780(10),c = 11.0881(6) ,α = 62.064(11),β = 73.410(15),γ = 78.404(16)°,C11H13CuNO6,Mr = 318.76,V = 645.79(8) 3,Z = 2,Dc = 1.639 g/cm3,F(000) = 326,μ = 1.712 mm-1,the final R = 0.0362 and wR = 0.1330 for 2055 observed reflections with I > 2σ(I).The title compound contains infinite inorganic chains constructed by Cu oxygen octahedra by sharing corners and edges.Each chain is connected by BDC linkers to four other chains to form a three-dimensional framework with irregular rhombic channels where the DMF molecules are encapsulated.     

Synthesis, Crystal Structure and Luminescent Property of a One-dimensional Europium Citrate Complex

A new compound, [Eu(Hcit)(H2O)2]·H2O]n (1, Hcit3-= C(OH)(COO-)(CH2COO-)2), has been synthesized under hydrothermal reactions of europium oxide, MnCl2·4H2O and citric acid at 120 ℃ for three days. The compound was characterized by single-crystal X-ray diffraction analyses, IR and TGA. Complex 1 crystallizes in monoclinic, space group P21/n with a = 6.179(1), b = 9.688(2), c = 16.990(3) , β = 91.98(3)°, Z = 4, V = 1016.4(3) 3, C6H11EuO10, Mr = 395.11, Dc = 2.582 g/cm3, μ = 6.218 mm-1, F(000) = 760, R = 0.0183 and wR = 0.0411. Single-crystal X-ray analysis reveals that complex 1 displays 1D ladder chains along the a axis, with dinuclear Eu2O2 units serving as "steps" and carboxylate groups as "uprights", which are connected by hydrogen bonds. The solid-state luminescent property of complex 1 was investigated at room temperature. Upon excitation at 394 nm, compound 1 exhibits interesting luminescent properties with several intense bands in the visible region and the most intense and sharp emission being in the red region at 615 nm. The TGA and XRD results prove that complex 1 undergoes facile thermal decomposition to form Eu2O3 at about 870 ℃.