Tri- and Mono-Nuclear Zinc(II) Complexes Based on Half- and Mono-Salamo Chelating Ligands

Abstract

Two newly designed complexes, [Zn(L 1 )(EtOH)] (1) and [{Zn(L 2 )(OAc) 2 } 2 Zn]·CHCl 3 (2) derived from salamo and half-salamo chelating ligands (H 2 L 1 and HL 2 ) have been synthesized and characterized by elemental analyses, IR and UV-VIS spectra, fluorescence spectra, and X-ray crystallography. Complex 1 shows a slightly distorted tetragonal pyramid and forms an infinite 3D supramolecular structure. All of the Zn(II) ions in complex 2 are hexa-coordinated with slightly distorted octahedral geometries. Complex 2 possesses an infinite 2D space structure. The fluorescence titration experiments were used to characterize fluorescence properties of complexes 1 and 2. And the normalized fluorescent spectra exhibit that complexes 1 and 2 have favourable fluorescent emissions in different solvents.

Synthesis, Crystal Structure, Luminescence, Electrochemical and Antimicrobial Properties of Bis(salamo)-Based Co(II) Complex

“…1,2-Bis(aminooxy)ethane, 2-hydroxy-1-naphthaldehyde and 2,3-dihydroxynaphthalene-1,4dicarbaldehyde were synthesized according an analogous procedure reported earlier [55,56]. The major reaction steps of H4L and its Co(II) complex are given in Scheme 1.…”

Trinuclear Co(II) and Mononuclear Ni(II) Salamo-Type Bisoxime Coordination Compounds

“…An Ar-O stretching band emerges at 1263 cm -1 in the IR spectrum of the free ligand H 2 L 1 , while those of coordination compounds 1 and 2 appear at 1205 and 1254 cm −1 , respectively. The Ar-O stretching bands are shifted to lower frequencies, which can be evidence of the coordination of phenolic oxygen atoms to the Co(II) and Ni(II) atoms [58,59]. The free ligand H 2 L 1 shows an expected absorption band at 3101 cm −1 and a sharp absorption band emerges at 3361 cm −1 in coordination compound 2, which indicates that the phenolic groups of the ligand have been deprotonated in the case of coordination compound 1 [60,61] …”

Synthesis and Fluorescence Properties of Asymmetrical Salamo-Type Tetranuclear Zinc(II) Complex

“…The Salamo metal complexes are widely utilized in various fields such as industrial catalyses [18,19], biological fields [20,21], ion recognitions [22][23][24], environmental sciences [25][26][27][28], and magnetic [29,30] and luminescent materials [31][32][33][34][35][36][37][38][39]. Recently, a lot of researchers have tried many approaches to change the (-CH=N-(CH 2 ) n -N=CH-) instead of (-CH=N-O-(CH 2 ) n -O-N=CH-) unit in order to make the exchange reaction and hydrolysis reaction rate of the compounds greatly reduced and the balance level raised to a very great extent, so the Salamo-type compounds are more stable than the Salen-type compounds [40][41][42].…”