Search

A series of new cadmium complexes (dyes1–5) were obtained by assembly of the donor–bridge–acceptor (D–π–A)-type ligand (L: 4′-(4-[4-(imidazole)styryl]phenyl) 2,2′ : 6′,2″-terpyridine) with CdX2(X=Cl, Br, I, NCS, ClO4), in which dye3was characterized by single crystal X-ray diffraction. Various weak interactions, including hydrogen bonds (C–H⋯N, C–H⋯X) and π–π interactions, played significant roles in the final topological structures. Linear and non-linear optical properties of ligand and the complexes were investigated. The two-photon absorption cross-section of these complexes are larger than that of ligand with maximum values of 577 GM (dye1), 242 GM (dye2), 171 GM (dye3), 326 GM (dye4), and 215 GM (dye5) in N,N-dimethylformamide. [ABSTRACT FROM AUTHOR]

Abstract: A simple D-π-A type ligand (L: 4′-(4-[4-(1H-[1,2,4]-triazolyl)styryl]phenyl)-2,2′:6′,2″-terpyridine) was designed and synthesized, which reacted with HgX2 (X=Cl, Br, I, SCN) yielding a series of uncommon five-coordinated mercury (II) complexes (Dyes 1–4). The ligand and Dye 4 were characterized by single crystal X-ray diffraction determination. Linear and nonlinear optical properties of the ligand and dyes were exhibited. Experimental results revealed that the two-photon absorption (TPA) cross-sections of the four dyes are considerably larger than that of the ligand. Density function theory (DFT) calculations performed on Dyes 1–4 showed that the halogens affect the accepting capability of the complexed metal due to different electron inductive effects, which finally influence the TPA cross-section values. [Copyright &y& Elsevier]