Syntheses, luminescences and Hirshfeld surfaces analyses of structurally characterized homo-trinuclear Zn-II and hetero-pentanuclear Zn-II-Ln(III) (Ln = Eu, Nd) bis(salamo)-like complexes

摘要

Homo-trinuclear [Zn-3(L)(mu(2)-OAc)(2)(H2O)](CH2Cl2)-C-center dot (1) and hetero-pentanuclear [Zn-4(L)(2)Eu(NO3)(3)(H2O)] (2) and [Zn-4(L)(2)Nd(NO3)(3)(H2O)]center dot CH3CH2OH (3) complexes containing a coumarin-skeleton bis(salamo) ligand H4L, were successfully prepared and characterized via the means of elemental analyses, single crystal X-ray crystallography, FT-IR, UV-Vis absorption spectroscopy and Hirshfeld surfaces analyses. Complex 1 is a 1:3 ((L)(4-):Zn-II) structure, and complexes 2 and 3 are 2:4:1 ((L)(4-):Zn-II:Ln(III)) structure. All Zn-II atoms in complexes 1-3 occupied the N2O2 sites are five-coordinated with geometries of slightly distorted tetragonal pyramid and trigonal bipyramid. Rare earth metal (Eu-III and Nd-III) atoms are both coordinated with phenolic oxygen atoms, and eight-coordinated with the square antiprism geometries in complexes 2 and 3. Water molecules as coordinating solvents participate in the coordination. Supra-molecular structures are built by C-H-center dot center dot center dot pi and hydrogen bonding interactions in complexes 1-3. Moreover, Hirshfeld surfaces analyses of complexes 1-3 were also analysed in detail. Most important of all, luminescences of complexes 1-3 were discussed.