Xin-Zhi Li, Xiao-Ping Zhou, Dan Li* and Ye-Gao Yin*

Abstract: To systematically investigate the effect of the pendant groups of ligands on the assembly of coordination polymers (e.g, controlling interpenetration), four terpyridine ligands with bulky pendant groups, namely, 40-(4-tolyl)-4,20:60,400-terpyridine (L1), 40-(4-ethylphenyl)-4,20:60,400-terpyridine (L2), 40-(4-isopropylphenyl)-4,20:60, 400-terpyridine (L3), and 40-biphenyl-4,20:60,400-terpyridine (L4) have been synthesized for comparative purposes. The reactions of CuCN and L1–L4 under the same solvothermal conditions provided four CuCN coordination polymers: [(CuCN)2L1]n (1), [(CuCN)2L2]n (2), [(CuCN)2L3]n (3), and {[(CuCN)3L41.5]$H2O}n) (4), respectively. Single-crystal X-ray analyses reveal that compounds 1-3 are isostructural with the same topological 4-fold interpenetrated 3D CuCN networks, and compound 4 is a non-interpenetrated CuCN network. This success demonstrates that the interpenetration is suppressed by the alteration of the size of the pendant groups of terpyridine ligands.

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