Abstract
The newly designed butterfly-shaped hetero-tetranuclear CuII-NaI coordination compound, [Cu3(HL)2Na]∙Pic (Pic− is abbreviation of picrate) (1) which is derived from a naphthalenediol-based bis(Salamo)-type chelating ligand H4L have been synthesized and characterized by elemental analyses, UV-vis spectra, IR spectra analysis, and Hirshfeld surface analysis. X-ray crystallographic analyses revealed that the coordination compound 1 is a novel hetero-tetranuclear CuII-NaI bis(Salamo)-type coordination compound and it differs from heterotrinuclear CuII-NaI bis(Salamo)-type coordination compound reported earlier. The Cu1 and Cu3 atoms are tetra-coordinated with geometries of distorted square pyramid, while Cu2 atom are hexa-coordinated with the geometry of a distorted octahedron. The NaI atom is octa-coordinated with the geometry of a distorted hexagonal bipyramid. Furthermore, the supramolecular structure and Hirshfeld surface analyses have been discussed in detail.
Highlights
To improve the properties of Salen-type ligands, in recent years, Nabeshima and our group’s researches mostly concentrated on the syntheses of Salamo-type ligands, which are a class of novel Salen-type analogues [39,40,41,42,43,44,45,46,47,48,49,50,51]. These Salamo-type multidentate ligands can self-assemble with transition metals, alkali metals, alkaline earth metals, and rare earth metals to form mononuclear or multinuclear 3d, 3d-s, 3d-4f coordination compounds [52,53,54,55,56,57,58,59,60]
Supramolecular chemistry has become increasingly prominent in the coordination chemistry, for Salamo-type metal coordination compounds, supramolecular structures are formed mainly with the help of C–H···O, C–H···π or π···π interactions [66,67,68]
The location of H∙∙∙H interactions appeared at (1.15 Å, 1.20 Å), accounting for 22.4% of the total area of Hirshfeld surfaces
Summary
Salen-type ligands and their coordination compounds have been extensively investigated [1,2,3,4,5,6,7,8,9,10]for their catalytic activities [11,12,13,14,15], biological activities [16,17,18,19,20,21,22], supramolecular architectures [23,24,25,26,27,28,29,30,31,32], and fluorescence properties [33,34,35,36,37,38]. To improve the properties of Salen-type ligands, in recent years, Nabeshima and our group’s researches mostly concentrated on the syntheses of Salamo-type ligands, which are a class of novel Salen-type analogues [39,40,41,42,43,44,45,46,47,48,49,50,51] These Salamo-type multidentate ligands can self-assemble with transition metals, alkali metals, alkaline earth metals, and rare earth metals to form mononuclear or multinuclear 3d, 3d-s, 3d-4f coordination compounds [52,53,54,55,56,57,58,59,60]. Bis(Salamo)-type ligands and their complexes have been explored by the Nabeshima group [69,70,71,72,73], the heteropolynuclear CuII -NaI bis(Salamo)-type coordination compounds were rarely reported [74]
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