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Spin Frustration in a Family of Pillared Kagomé Layers of High‐Spin Cobalt(II) Ions
Author(s) -
Wang LongFei,
Li CuiJin,
Chen YanCong,
Zhang ZeMin,
Liu Jiang,
Lin WeiQuan,
Meng Yan,
Li QuanWen,
Tong MingLiang
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404847
Subject(s) - frustration , crystallography , pillar , pyrazine , hydrothermal circulation , condensed matter physics , spin (aerodynamics) , materials science , cobalt , ion , ligand (biochemistry) , atmospheric temperature range , chemistry , stereochemistry , inorganic chemistry , physics , geology , biochemistry , structural engineering , organic chemistry , meteorology , engineering , thermodynamics , seismology , receptor
Based on the analogous kagomé [Co 3 (imda) 2 ] layers (imda=imidazole‐4,5‐dicarboxylate), a family of pillar‐layered frameworks with the formula of [Co 3 (imda) 2 (L) 3 ] ⋅ (L) n ⋅ x H 2 O ( 1 : L=pyrazine, n =0, x =8; 2 : L=4,4′‐bipyridine, n =1, x =8; 3 : L=1,4‐di(pyridin‐4‐yl)benzene, n =1, x =13; 4 : L=4,4′‐di(pyridin‐4‐yl)‐1,1′‐biphenyl, n =1, x =14) have been successfully synthesized by a hydrothermal/solvothermal method. Single‐crystal structural analysis shows a significant increase in the interlayer distances synchronized with the extension of the pillar ligands, namely, 7.092(3) ( 1 ), 10.921(6) ( 2 ), 14.780(5) ( 3 ), and 19.165(4) Å ( 4 ). Despite the wrinkled kagomé layers in complexes 2 – 4 , comprehensive magnetic characterizations revealed weakening of interlayer magnetic interactions and an increase in the degree of frustration as the pillar ligand becomes longer from 1 to 4 ; this leads to characteristic magnetic ground states. For compound 4 , which has the longest interlayer distance, the interlayer interaction is so weak that the magnetic properties observed within the range of temperature measured would correspond to the frustrated layer.