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Formation of various polymeric frameworks by dicarboxylate-like ligands: Synthesis and crystal structures of polymeric complexes of sodium perchlorate with flexible double betaines
Authors:De-Dong Wu  Thomas C. W. Mak
Affiliation:(1) Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
Abstract:Three crystalline complexes of sodium perchlorate with different flexible double betaines [Na2(L1)(ClO4)(H2O)n](ClO4)n (1), [Na3(L2)(ClO4)3(H2O)2n] (2), and [Na(L3)(CH3OH)n]-(ClO4)n·xnH2O (x=0.25) (3) [O2CCH2N+Me2–(CH2)n-N+Me2CH2CO2,n=2 L1;n=3 L2;n=4 L3] have been synthesized and characterized by single-crystal X-ray structure analysis. Complex (1) comprises tetranuclear sodium units consolidated by betaine and aqua ligands, which are bridged by half of the ClO4 anions to form layers matching the (200) planes, the remaining uncoordinated ClO4 anions being accommodated between adjacent layers. Complex (2) possesses a double-layer polymeric structure with the sodium atoms bridged by ligand oxygen atoms to form columns running parallel to thea axis, which are interconnected by double-betaine ligands lying parallel to theac plane. All of the ClO4 groups and water molecules are coordinated to the metal atoms. In complex (3) the chains composed of alternating eight-membered and four-membered metallocycles are cross-linked by the betaine ligands, which lie in the (020) and (01/1) families of planes, to yield a three-dimensional network. All of the ClO4 groups and water molcules fill the resulting infinite channels running parallel to thea axis. Two unusual carboxylate coordination modes are identified, namelymgr3-O andhapto-3-O plushapto-2-Oprime in (1) and (2), respectively.
Keywords:Betaine  sodium perchlorate  crystal structure  polymeric framework
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