A New Half-Salamo-Based Homo-Trinuclear Nickel(II) Complex: Crystal Structure, Hirshfeld Surface Analysis, and Fluorescence Properties

Abstract

A new homo-trinuclear Ni(II) half-salamo-based complex [Ni3(L)2(μ-OAc)2(OAc)2(CH3OH)2]·2CH3OH was synthesized via the reaction of a tridentate ligand HL (2-[O-(1-ethyloxyamide)]oxime-4-bromophenol) and Ni(OAc)2·4H2O, and characterized using elemental analyses, IR spectra, UV-Vis absorption spectra, X-ray crystallography, and Hirshfeld analysis. Interestingly, single-crystal X-ray analysis showed that the two acetate molecules were bonded simultaneously with the Ni(II) atoms by mono-dentate chelating and bidentate bridging coordination modes, respectively, and the resulting hexa-coordinate geometries were ultimately formed. Furthermore, the Hirshfeld analysis of the complex was studied. Compared with HL, the complex fluorescence intensity was significantly lowered, indicating that the Ni(II) ions have fluorescence quenching characteristics.

Synthesis and crystal structure of (1E,3E)-2-hydroxy-5-methylisophthalaldehyde O,O-di(2-((((E)-(2-hydroxynaphthalen-1-yl)methylene)amino)oxy)ethyl) dioxime, C35H32N4O7

“…As is generally known, salen compound and its derivatives are a class of very important N 2 O 2 chelating ligands in inorganic chemistry [5], their metal complexes not only show a variety of catalytic and optical properties [6], but also have some advantages in the field of antibiosis, treatment of tumors, biological activities and so on [7]. Salamo compounds form metal complexes with interesting properties.…”

Unprecedented Dinuclear CuII N,O-Donor Complex: Synthesis, Structural Characterization, Fluorescence Property, and Hirshfeld Analysis

“…When the concentration of the Cu II ion increased gradually, the absorption peaks had evidently changed to 271 nm. Compared with the peak (266 nm) of the free ligand HL 1 , this absorption peak was red-shifted, and another absorption peak at 324 nm disappeared in the UV-Vis absorption spectrum of the Cu II complex, which indicated that the oxime nitrogen atoms of the ligand H 2 L 2 have coordinated to the Cu II ions [14,16].…”

“…In fact, the latter always assembled supramolecular structures through the formation of intermolecular hydrogen bondings involving solvent molecules [22,30,[35][36][37]. The intramolecular and intermolecular interactions of molecular crystal of the Cu II complex were explored further by surface analysis using the Crystal Explorer program [14]. The interactions in molecular crystal can be clearly observed.…”

“…In recent years, based on the research of salen and its derivatives, a new salamo-like ligand and its derivatives (R-CH=N-O-(CH 2 ) n -O-N=CH-R) have been developed, as the cavity formed by N 2 O 2 is easier to bind with metal ions [9][10][11][12][13]. When different metal ions are added, mononuclear and multinuclear metal complexes with different structures are expected, which show superior stability and flexibility compared with salen-like compounds [14][15][16][17]. The salamo-like ligands and their metal complexes have special properties and potential applications.…”

Single‐armed salamo‐like dioxime and its multinuclear Cu (II), Zn (II) and Cd (II) complexes: Syntheses, structural characterizations, Hirshfeld analyses and fluorescence properties

“…Two kinds of cavities, N 2 O 2 and O 2 O 2 , are formed in salen‐like or salamo‐like organic ligands, and most transitional and rare earth metal ions can coordinate with the cavity to form mononuclear, multinuclear and heteropolynuclear salen‐like complexes. Compared to salamo‐like ligands, single‐armed salamo‐like ligands can produce more conformational changes and coordination polymers, as well as uncover new features. The transition from salamo‐like ligands to single‐armed salamo‐like ligands can provide a variable supramolecular configuration and also give rise to the ligand possessing new coordination characteristics.…”