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A three‐dimensional mixed‐valence Cu II /Cu I coordination polymer constructed from biphenyl‐3,4′,5‐tricarboxylate and 1,4‐bis(1 H ‐imidazol‐1‐yl)benzene ligands
Author(s) -
Liu Ya-Hui,
Lu Li-Ping,
Zhu Miao-Li,
Su Feng
Publication year - 2016
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229616004824
Subject(s) - chemistry , crystallography , ligand (biochemistry) , denticity , trigonal bipyramidal molecular geometry , biphenyl , valence (chemistry) , benzene , metal , molecule , pentagonal bipyramidal molecular geometry , coordination polymer , bipyramid , crystal structure , stereochemistry , organic chemistry , biochemistry , receptor
Coordination polymers (CPs) built by coordination bonds between metal ions/clusters and multidentate organic ligands exhibit fascinating structural topologies and potential applications as functional solid materials. The title coordination polymer, poly[diaquabis(μ 4 ‐biphenyl‐3,4′,5‐tricarboxylato‐κ 4 O 3 : O 3′ : O 4′ : O 5 )tris[μ 2 ‐1,4‐bis(1 H ‐imidazol‐1‐yl)benzene‐κ 2 N 3 : N 3′ ]dicopper(II)dicopper(I)], [Cu II 2 Cu I 2 (C 15 H 7 O 6 ) 2 (C 12 H 10 N 4 ) 3 (H 2 O) 2 ] n , was crystallized from a mixture of biphenyl‐3,4′,5‐tricarboxylic acid (H 3 bpt), 1,4‐bis(1 H ‐imidazol‐1‐yl)benzene (1,4‐bib) and copper(II) chloride in a water–CH 3 CN mixture under solvothermal reaction conditions. The asymmetric unit consists of two crystallographically independent Cu atoms, one of which is Cu II , while the other has been reduced to the Cu I ion. The Cu II centre is pentacoordinated by three O atoms from three bpt 3− ligands, one N atom from a 1,4‐bib ligand and one O atom from a coordinated water molecule, and the coordination geometry can be described as distorted trigonal bipyramidal. The Cu I atom exhibits a T‐shaped geometry (CuN 2 O) coordinated by one O atom from a bpt 3− ligand and two N atoms from two 1,4‐bib ligands. The Cu II atoms are extended by bpt 3− and 1,4‐bib linkers to generate a two‐dimensional network, while the Cu I atoms are linked by 1,4‐bib ligands, forming one‐dimensional chains along the [20] direction. In addition, the completely deprotonated μ 4 ‐η 1 :η 1 :η 1 :η 1 bpt 3− ligands bridge one Cu I and three Cu II cations along the a (or [100]) direction to form a three‐dimensional framework with a (10 3 ) 2 (10) 2 (4 2 .6.10 2 .12) 2 (4 2 .6.8 2 .10) 2 (8) topology via a 2,2,3,4,4‐connected net. An investigation of the magnetic properties indicated a very weak ferromagnetic behaviour.