摘要
以α H3 PMo12 O40 ·nH2 O ,La2 O3 和二甲基亚砜 (DMSO)为原料 ,在乙腈和水的混合溶剂中制得了一维锯齿链状配位聚合物 [{La(DMSO) 6(H2 O) }(PMo12 O40 )·H2 O] n.X射线单晶衍射结果表明 ,聚合物中金属配阳离子与杂多阴离子骨架通过Mo Od La Od Mo相连并形成一维无限链 ,每一个不对称结构单元中含一个结晶水 ,La3 + 的配位数为九 ,三帽三棱柱构型 ,配位氧原子分别来自 6个DMSO分子 ,1个H2 O分子和 2个相邻杂多阴离子的端氧 .晶体属于单斜晶系 ,P2 1/c空间群 ,a =1 3 916(3 )nm ,b =1 70 5 8(3 )nm ,c =2 475 0 (5 )nm ,β =99 16(3 )° ,Z =4,V =5 80 0 (2 )nm3 ,Dc=2 82 5g/cm3 ,R1=0 0 44 6,wR2 =0 0 871.IR光谱和X射线单晶衍射结果一致表明 ,在固态条件下配阳离子和杂多阴离子之间存在相互作用 .UV光谱表明 ,在稀的水溶液中 ,由于溶剂化作用 ,杂多阴离子与配阳离子处于解离状态 .热性质研究表明 ,形成标题化合物后 。
The 1D zigzag chain compound of [{La(DMSO) 6(H 2O)}(PMo 12O 40)·H 2O] n has been synthesized by reaction of α-H 3PMo 12O 40·nH 2O, La 2O 3 and DMSO in acetonitrile-water mixture and characterized by elemental analysis, IR and UV spectra, and X-ray single crystal structural analysis. The crystal structure indicates that the title compound forms an unprecedented one-dimensional zigzag chain built from the alternating polyanions and cationic units through Mo-O d-La-O d-Mo links. In the compound, there is a crystal water molecule in every unsymmetric structure unit and La 3+ cations are nine-coordinated in a tricapped trigonal prism geometry environment with oxygen atoms from six DMSO molecules, one H 2O molecule and two adjacent polyanions. It belongs to monoclinic space group P2 1/c, with unit cell dimensions a=1.3916(3) nm, b=1.7058(3) nm, c=2.4750(5) nm, β=99.16(3)°, V= 5.800(2) nm 3, D c=2.825 g/cm 3, Z=4, R 1=0.0446, wR 2=0.0871. The result of the single crystal X-ray diffraction analysis is in agreement with that of IR measurement, and both show that the metal cation units are coordinately bonded to the Keggin cluster. The UV spectrum of the title compound suggests that the compound is entirely disruptive in dilute solution. The result of TG-DTA shows that the title compound is thermally more table than that of α-H 3PMo 12O 40·nH 2O.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2003年第8期1276-1280,共5页
Acta Chimica Sinica
基金
河南省杰出青年资助项目
河南省自然科学基金 (Nos.0 0 4 0 31 80 0
0 0 4 0 4 0 30 0 )资助项目
