An investigation of structure, Hirshfeld surface, and fluorescence properties of two dinuclear Ni (II) and Zn (II) salamo-type complexes

Two dinuclear Ni (II) and Zn (II) salamo-type complexes, [Ni-2(L)(mu-OAc)(MeOH)]center dot 2CHCl(3) (1) and [{Zn-2(L)(mu-OMe)}(3)]center dot 3CHCl(3)center dot MeOH (2), have been successfully synthesized by wet-chemical method and characterized by elemental analyses, IR spectra, UV-Vis spectra and single crystal X-ray diffraction. Complex 1 consists of two closely related dinuclear units 1A and 1B, and complex 2 consists of three closely related dinuclear units 2A, 2B and 2C. The five units are unique example of crystallographically independent but chemically identical molecules. The Ni (II) atoms of complex 1 are located in the N2O4 coordination cavities, possessing six-coordinated distorted octahedral geometries, but all Zn (II) atoms in complex 2 are located in the N2O3 coordination cavities, possessing five-coordinated distorted square-pyramid and triangular bipyramid geometries, the geometries about the Zn (II) atoms (Zn3 and Zn6) that obtain in 2B and 2C where tau(5) is very close to 0.500, which is tau(5Zn3) = 0.5006 and tau(5Zn6) = 0.4941, respectively. The interactions were quantitatively determined by Hirshfeld surfaces analyses. Significantly, fluorescence properties were also investigated.

Automated summary

Two dinuclear Ni(II) and Zn(II) salamo-type complexes have been successfully synthesized and characterized by various techniques. These complexes exhibit unique geometric relationships and interactions between molecules.