Homo- and heterometallic Cu(II)-M(II) (M = Ca, Sr and Ba) bis(salamo)-based complexes: Syntheses, structures and fluorescent properties.

Four homo/heterometallic complexes [Cu(L)(μ-OAc)(CHOH) ]·3CHCl (1), [Cu(L)Ca(μ-NO)] (9), [{Cu(L)Sr(μ-NO)}]·CHCHOH (11) and [Cu(L)Ba(μ-OAc)(OAc)] (14), containing an acyclic naphthalenediol-based ligand HL, were synthesized and characterized by elemental analyses, IR, UV-Vis, fluorescence spectra, TG-DTA and X-ray crystallography. The complex 1 was obtained by the reaction of HL with 11 equivalents of Cu(OAc) ·2HO. The heterometallic complexes 9, 11, 14 were acquired by the reaction of HL with 9 equivalents of Cu(OAc)·2HO or Cu(NO)·2HO and 1 equivalent of M(OAc) (M = Ca, Sr and Ba). Owing to the different coordination cavities of the NO and O of the completely deprotonated (L) unit, the crystal structures showed the NO sites were occupied by Cu(II) atoms, alkaline earth metal(II) atoms occupied the O site of the ligand (L) unit, respectively. Furthermore, the fluorescence properties and TG-DTA analyses were discussed.