Four divalent metal thiocyanate coordination compounds containing a rigid functional pyridine ligand

A series of new coordination compounds Zn(SCN)2L2 (1), Co(SCN)2L2 (2), [Cd(SCN)2L2·2L]n (3) and [CdHg(SCN)4L2]n (4) have been prepared by self-assembly of a rigid functional pyridine ligand, trans-4-[4′-(N-methyl-N-hydroxyethyl)amimo]styryl pyridine (abbreviated as L) with M(SCN)x (M: Zn, Co, Cd, CdHg; x: 2, 4). The crystal structures indicate that 1 and 2 are mononuclear compounds while 3 and 4 are coordination polymers. O–H⋯N, C–H⋯O, O–H⋯π and C–H⋯π hydrogen bonds play significant roles in the final crystal structures. The solid-state luminescence properties have been measured. The results indicate that the photoluminescence spectra of all the compounds can be changed by the frameworks and introducing of different metal ions.

Graphical abstractSelf-assembly of a rigid functional pyridine ligand trans-4-[4′-(N-methyl-N-hydroxyethyl)amimo]styryl pyridine) with M(SCN)x (M: Zn, Co, Cd, CdHg; x: 2, 4) yields a new series of coordination compounds Zn(SCN)2L2, Co(SCN)2L2, [Cd(SCN)2L2·2L]n and [CdHg(SCN)4L2]n.Figure optionsDownload full-size imageDownload as PowerPoint slide