Distinct Cd and Co thiocyanate coordination complexes with 2,5-bis(pyrazinyl)-1,3,4-oxadiazole: Metal-directed assembly of a 1-D polymeric chain and a 3-D supramolecular network |
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| Authors: | Miao Du Cheng-Peng Li Jian-Hua Guo |
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| Institution: | College of Chemistry and Life Science, Tianjin Normal University, 241, Wei Jin Road, Tianjin 300074, PR China |
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| Abstract: | The reactions of 2,5-bis(pyrazinyl)-1,3,4-oxadiazole (bpzo) with CdII or CoII salt in the presence of thiocyanate afford two distinct complexes, a 1-D coordination array Cd(bpzo)2(SCN)2]n (1) and a 3-D hydrogen-bonded supramolecular network Co(bpzo)2(SCN)2(H2O)2](CH3CN)2(H2O)2 (2). X-ray single-crystal structural determination reveals that the extended networks of complexes 1 and 2 are manipulated via different directional propagating forces. In 1, the adjacent CdII centers are bridged by a pair of μ1,3-SCN− anions to form a 1-D array, whereas in 2, the monomeric CoII coordination entities are hydrogen-bonded into a novel 3-D architecture in which the thiocyanate ions take the only N-binding mode. In both cases, bpzo behaves as monodentate terminals. These results indicate that the choice of metal ions does play a critical role in the supramolecular assembly. The structural and binding features of bpzo in all related compounds have also been discussed. |
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| Keywords: | 2 5-Bis(pyrazinyl)-1 3 4-oxadiazole Crystal structures CdII and CoII complexes Thiocyanate Hydrogen bonds |
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