镧系螺旋配位聚合物自组装成三维金属有机骨架结构。

Self-assembly of lanthanide helicate coordination polymers into 3D metal-organic framework structures.

作者信息

Ghosh Sujit K, Bharadwaj Parimal K

机构信息

Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India.

出版信息

Inorg Chem. 2004 Apr 5;43(7):2293-8. doi: 10.1021/ic034982v.

DOI:10.1021/ic034982v

PMID:15046504

Abstract

Pyridine-2,6-dicarboxylic acid (pdcH(2) ) reacts with nitrate salts of La(III), Ce(III), and Nd(III) under hydrothermal conditions to form three-dimensional network structures, 1-4. All the compounds crystallize in the monoclinic space group P2(1)/c with the following lattice parameters: [La(2)(pdc)(3).3H(2)O] 1, a = 10.966(3) A, b = 17.534(4) A, c = 13.578(2) A, beta = 100.23(3) degrees, V( )()= 2569.3(9) A(3), Z = 4, R1 = 0.052, wR2 = 0.143, S = 1.06; [Ce(2)(pdc)(3).3H(2)O] 2, a = 12.701(3) A, b = 9.979(1) A, c = 19.401(4) A, beta = 97.73(2) degrees, V( )()= 2436.6(8) A(3), Z = 4, R1 = 0.039, wR2 = 0.117, S = 1.30; [Ce(2)(pdc)(3).3H(2)O] 3, a = 10.961(5) A, b = 17.523(5) A, c = 13.505(2) A, beta = 100.89(3) degrees, V( )()= 2547.2(8) A(3), Z = 4, R1 = 0.040, wR2 = 0.103, S = 1.08; [Nd(2)(pdc)(3).3H(2)O] 4, a = 10.944(3) A, b = 17.448(5) A, c = 13.397(2) A, beta = 101.19(3) degrees, V( )()= 2569.3(9) A(3), Z = 4, R1 = 0.052, wR2 = 0.143, S = 1.06. Compounds 1, 3, and 4 form infinite single helical chains with large widths and pitches containing four metal ions per turn while 2 forms a different helix with smaller width and pitch containing two metal ions per turn. Each helix is further bonded on either side via carboxylate bridging producing three-dimensional metal-organic framework structures.

摘要

吡啶 -2,6 - 二甲酸（pdcH₂）在水热条件下与La(III)、Ce(III)和Nd(III)的硝酸盐反应，形成三维网络结构1 - 4。所有化合物均结晶于单斜空间群P2(1)/c，具有以下晶格参数：[La₂(pdc)₃·3H₂O] 1，a = 10.966(3) Å，b = 17.534(4) Å，c = 13.578(2) Å，β = 100.23(3)°，V = 2569.3(9) Å³，Z = 4，R1 = 0.052，wR2 = 0.143，S = 1.06；[Ce₂(pdc)₃·3H₂O] 2，a = 12.701(3) Å，b = 9.979(1) Å，c = 19.401(4) Å，β = 97.73(2)°，V = 2436.6(8) Å³，Z = 4，R1 = 0.039，wR2 = 0.117，S = 1.30；[Ce₂(pdc)₃·3H₂O] 3，a = 10.961(5) Å，b = 17.523(5) Å，c = 13.505(2) Å，β = 100.89(3)°，V = 2547.2(8) Å³，Z = 4，R1 = 0.