New Journal of Chemistry p. 5593 - 5601 (2018)
Update date:2022-08-11
Topics:
Zhang, Zongyao
Xu, Lijin
Cao, Rui
A highly flexible tris-imidazole ligand N(CH2-m-C6H4-CH2-imidazole)3 (L) constructed using a tris(xylyl) backbone was synthesized. Its reactions with three cadmium(ii) salts gave various Cd(ii) coordination polymers, namely [CdL2](ClO4)2 (1), [CdLCl2] (2), and [CdL(OAc)2] (3). X-ray studies revealed that 1 crystallized in the trigonal space group R3 with high symmetry, while 2 and 3 crystallized in lower symmetrical space groups due to Cd-anion coordination. The flexibility of ligand L was evidenced in these structures, showing different conformations of L upon coordination and crystallization. In addition, complex [CdL2]Cl2 (4) was obtained by the anion exchange of 1 with sodium chloride via a single crystal to single crystal transformation. Similar to 1, complex 4 also crystallized in the trigonal space group R3 with a = 13.0945(3), b = 37.4353(10), and V = 5559.2(2). Importantly, this single crystal to single crystal transformation is crucial to afford this Cd(ii) coordination polymer with unbound Cl- anions, as the direct reaction of L and CdCl2 gives complex 2 with Cd-bound Cl-. This work shows the importance of flexible ligands in constructing various coordination polymer structures through the regulation of anions.
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