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Metal‐ and Substituent‐Dependent Structural Diversity in Cobalt and Nickel Isophthalate Coordination Polymers with Bis(4‐pyridylformyl)piperazine Tethers
Author(s) -
Glatz Erika J.,
Rogers Ciana M.,
Bell Lestella D.,
LaDuca Robert L.
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201500127
Subject(s) - piperazine , nickel , cobalt , crystallography , coordination polymer , chemistry , substituent , ligand (biochemistry) , molecule , magnetic susceptibility , metal , stereochemistry , crystal structure , materials science , inorganic chemistry , organic chemistry , biochemistry , receptor
Abstract Hydrothermal reactions of nickel or cobalt nitrate with the dipyridylamide ligand bis(4‐pyridylformyl)piperazine (4‐bpfp) and either 5‐methoxyisophthalate (H 2 omeip) or 5‐methylisophthalate (H 2 mip) afforded a series of coordination polymers that were structurally characterized by single‐crystal X‐ray diffraction. Different synthetic conditions afforded the 1D chain phase {[Ni(Homeip) 2 (H 2 omeip)(bpfp)] · 2H 2 O} n ( 1 ) or the mutually inclined interpenetrated (4, 4) grid system in {[Ni(omeip)(bpfp)(H 2 O)] · 2H 2 O} n ( 2 ). The analogous cobalt phase {[Co(omeip)(bpfp)] · 3H 2 O} n ( 3 ) lacks bound water molecules, which enforces a non‐interpenetrated (4, 4) grid structure based on {Co 2 (OCO) 2 } dinuclear clusters. Similar clusters are seen in {[Co(mip)(bpfp)(H 2 O) 2 ] · 3.5H 2 O} n ( 4 ), which manifests a 1D ribbon structural motif. Its nickel congener {[Ni(Hmip) 2 (bpfp)(H 2 O) 2 ] · 2H 2 mip} n ( 5 ) also shows a 1D chain motif. A variable temperature magnetic susceptibility study indicates antiferromagnetic coupling within the dimeric units in 3 and 4 concomitant with single ion effects. Additionally, thermal degradation properties of these new materials are described.