Abstract
A new non-interpenetrated two-dimensional (2D) rectangular-grid coordination polymer, {[Co(L)(2)(H(2)O)(2)] x (BF(4))(2) x 4 DMF}(n) (1), has been synthesized using a new rod-like ligand, 3,5-bis(4-imidazol-1-ylphenyl)-[1,2,4]triazol-4-ylamine (L). Weakly H-bonded BF(4)(-) anions present within the voids can be exchanged by ClO(4)(-) and NO(3)(-) anions to generate {[Co(L)(2)(H(2)O)(2)] x (ClO(4))(2) x 2 DMF x 2 H(2)O}(n) (2) and {[Co(L)(2)(H(2)O)(2)] x (NO(3))(2) x 2 DMF x 2 H(2)O}(n) (3) in single-crystal-to-single-crystal (SC-SC) manner. In the case of exchange by Cl(-) ion, the crystallinity is not maintained, and so it is proven by IR spectroscopy, PXRD, and elemental analysis. In addition, 3 shows an interesting structural transformation (2D --> 1D) with bond rupture/formation leading to the formation of a new coordination polymer, {[Co(L)(2)(H(2)O)(2)] x (NO(3))(2) x 2 DMF x H(2)O}(n), (5), again in SC-SC fashion.
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