Cobalt isothiocyanate coordination polymers constructed from isomeric bis(pyridylmethyl)piperazine ligands: Ribbon and chain motifs and a novel (3,4)-connected supramolecular layer |
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| Authors: | David P. Martin Ronald M. Supkowski |
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| Affiliation: | a Lyman Briggs College and Department of Chemistry, Michigan State University, E-30 Holmes Hall, East Lansing, MI 48825, USA
b Department of Chemistry and Physics, King’s College, Wilkes-Barre, PA 18711, USA |
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| Abstract: | Slow diffusion conditions have afforded a pair of cobalt isothiocyanate coordination polymers incorporating the flexible and hydrogen-bonding capable organodiimines N,N′-bis(3-pyridylmethyl)piperazine (3-bpmp) and N,N′-bis(4-pyridylmethyl)piperazine (4-bpmp), which were characterized by single-crystal X-ray diffraction and spectral and elemental analysis. While both [Co(NCS)2(3-bpmp)2]n (1) and {[Co(NCS)2(H2O)2(4-bpmp)] · 2H2O}n (2) possess one-dimensional (1-D) coordination polymer units, the donor disposition within the organodiimine promotes significant structural disparities. Compound 1 displays a 1-D double-chain motif, where each cobalt ion is bridged by two exobidentate 3-bpmp ligands. In contrast, compound 2 manifests a single chain pattern, with only one tethering 4-bpmp ligand joining adjacent cobalt ions. Extensive hydrogen-bonding patterns within the structure of 2 results in an intriguing supramolecular 2-D (3,4)-connected layer with (4.62)2(42.62.82) topology. Thermal properties of these materials are also discussed. |
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| Keywords: | Cobalt Isothiocyanate Organodiimine Coordination polymer Crystal structure Thermogravimetric analysis |
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