Syntheses, Hirshfeld surface analyses, and luminescence of four new complexes

Abstract

Four Cd-based complexes with chemical formulae [Cd(L¹)₂(2,2'-Bipy)(H₂O)] (I), [Cd(L²)₂(2,2'-Bipy) · 2H₂O] (II), [Cd(L¹)₂(Phen)(H₂O)] (III), {[Cd(L¹)₂(H₂O)(4,4'-Bipy)] · 3H₂O} (IV) (HL¹ = 3-(4-hydroxyphenyl)propanoic acid, HL² = p-hydroxyphenylacetic acid, Phen = phenantroline), have been synthesized and structurally characterized (CIF file CCDC nos. 1044844 (I), 1044844 (II), 1044844 (III), 1044847 (IV)). Single-crystal X-ray analyses reveal that compounds I and III have mononuclear Cd(II) units linking by three carboxylate groups, complex II shows dinuclear motif, whereas IV exhibits 1D chain constructed by bridging 4,4'-Bipy ligand. The assistant effect of chelating N-donor ligands with 2,2'-Bipy and Phen bind and bridging 4,4'-Bipy, as well as the flexibility of carboxylate, play an important to modulate on the resulting motifs. The detailed analyses of Hirshfeld surface and fingerprint plots provide insight into the nature of non-covalent interactions in the title compounds. Furthermore, the luminescent properties of the all compounds were discussed in detail.