Two temperature-controlled chiral Ag(i) coordination polymers with dual chiral components: synthesis, luminescence and SHG properties

Abstract

Two new temperature-controlled coordination polymers, {{Ag_2.67[(1R,2R,N¹S,N²S)-4-bpcd]₂}·2.67ClO₄·1.33H₂O}_n (1) and {{Ag[(1R,2R,N¹S,N²S)-4-bpcd]}·ClO₄·H₂O}_n (2) [(1R,2R)-4-bpcd = (1R,2R)-N¹,N²-bis(pyridin-4-ylmethyl)cyclohexane-1,2-diamine], with congenital chiral centers from the ligand and acquired chiral centers formed by the coordination interaction, have been synthesized via a chiral multidentate organic bridging ligand, in which 1 displays a chiral (6,3) network, while 2 has a (4,4) topology. Circular dichroism (CD) spectra confirmed that the bulk samples are chiral. The frameworks have potential as multifunctional materials due to their luminescent and nonlinear optical (NLO) properties. The present study demonstrates that reaction temperature is a crucial factor for the construction of coordination polymers.