Mono- and dinuclear Zn(II) complexes of Schiff-base ligands: syntheses, characterization and studies of photoluminescence

Synthesis of Novel Pyridyl-Based Schiff Base and Its Coordination Behaviour with Ruthenium(II) and Zinc(II)

“…MeOH -Reflux Scheme-I: Synthesis of the Schiff base ligand with their reaction with ruthenium(II) and zinc (II) multidentate N-based ligands provides coordination complexes with tetrahedral [30,31], trigonal bipyrimidal [31,32] and octahedral geometries [32]. The zinc coordinates to one site of pyridyl-CH=N while the second CH=N undergoes an oxidation reaction to produce the amino group.…”

“…The coordination environment of Zn(II) ion can be described as trigonal pyramidal, τ = 0.81 (Extreme Forms: 0.00 for SQP and 1.00 for TET; 0.85 for TRP) [33]. Although, Zn(II) complexes normally adopt tetrahedral geometry [30,31] or less commonly trigonal bipyrimidal [31,32] due to the lack of any ligand field stabilization energy of the d 10 metal, the bulkiness of the methyl group forces the unusual geometry of the complex. The bond angles around the Zn(II) ion are N1-Zn1-N2 = 81.3(2), N1-Zn1-Cl2 = 116.87(16), N2-Zn1-Cl2 = 105.57(11), N1-Zn1-Cl1 = 108.68 (19), N2-Zn1-Cl1 = 123.16 (16) and Cl2-Zn1-Cl1 = 116.74(9)°.…”

Phenoxide bridged tetranuclear Co(II), Ni(II), Cu(II) and Zn(II) complexes: Syntheses, characterization and fluorescence studies

“…2,6-diformyl-4-methylphenol and its derivatives are suitable models to study all these properties. Some derivatives of 2,6-diformyl-4-methylphenol and 2-substituted benzimidzoles exhibit fluorescence property and can be used to design zinc ionselective luminescent probe for biological application under physiological conditions [4][5][6]. Benzimidazole has strong p-conjugative effect and its LUMO could receive the outmost electron of metal to form feedback p-bond.…”

Synthesis and Crystal Structures of Zinc(II) Complexes with Schiff Bases Derived from 2-Acetylpyridine

“…[7] The zinc complexes with the Schiff bases derived from salicylaldehyde and its analogues have been extensively studied. [8][9][10][11] However, zinc complexes with the Schiff bases derived from 2-acetylpyridine have seldom been reported. In the present article, a series of zinc complexes with the Schiff bases N-methyl-N'-(1-pyridin-2-ylethylidene)ethane-1,2-diamine (MEA), (2-morpholin-4-ylethyl)-(1-pyridin-2-ylethylidene)amine (MA), and (2-piperidin-1-ylethyl)-(1-pyridin-2-ylethylidene)amine (PA), were prepared, and their crystal structures are presented.…”