A Fluorescent Hexanuclear Zn(II) Complex

Abstract

Zn(II) Schiff base complexes are good precursors for preparation of ZnO nanoparticles which find several biomedical applications. Herein, a fluorescent hexanuclear Zn(II) Schiff base complex [Zn(II)6(L−Me)6(MeOH)2]⋅12MeOH(1) [H2L‐Me=diprotic Schiff base ligand] has been synthesized and characterized by single crystal X‐ray diffraction, NMR spectroscopy and mass spectrometry. Fluorescence properties of this Zn(II)6‐complex have also been studied in solid state and solution. Lifetime measurement and quantum yield calculation have been performed to further investigate the fluorescence properties. Temperature dependent stability of complex 1 has been studied in air and inert gas atmospheres. Fluorescent ZnO nano‐particles were prepared by thermal decomposition of 1 at 400 °C and higher temperatures under aerobic atmosphere.

A Series of Umbrella‐Shape Copper‐Lanthanides Based Mixed Metallic Coordination Complexes

“…The complex 2 was heated in the range of 30–930 °C at a heating rate of 20 °C/min under the flow of nitrogen at the flow rate of 60 mL/min. The complexes which have same ligand follow similar decomposition pattern and scheme ).…”

Isolation and Characterization of Different Homometallic and Heterobimetallic Complexes of Nickel and Zinc Ions by Controlling Molar Ratios and Solvents

“…Fluorescence spectra of the complexes 1 – 3 (Figure and Figure ) shows very high fluorescence intensity enhancement compared to ligand . This enhancement in fluorescence intensity may be attributed to the increased rigidity in the ligand due to coordination that leads to the slow non‐radiative relaxation , , ,…”

“…The UV/Vis spectra of all the complexes in solution show three major absorption peaks in the range of 280–500 nm (Figure ). These absorption bands can be assigned to π–π*, n→π* and ligand‐to‐metal charge transfer (LMCT) or metal‐to‐ligand charge transfer (MLCT) . The lower energy band appearing in the range of 280–310 nm is due to π–π* transition in the benzene ring of the ligands.…”

Idiosyncatic recognition of Zn2+ and CN− using pyrazolyl-hydroxy-coumarin scaffold and live cell imaging: depiction of luminescent Zn(ii)-metallocryptand

“…The biochemical implication of ions in human health and environment focuses on the synthetic strategy of a receptor in such a manner that the chemosensor selectively emits recognizable signals on binding with bioactive or toxic cations and anions. Polypodal Schiff bases may synthesize multinuclear metallo–macrocycle complexes, 1,2 which may act as potential magnetic materials, 3,4 homogeneous catalysts, 5 optical and electronic materials, 6,7 sensing devices, 8 etc . Schiff bases with fluorogenic components such as carbazole, 9,10 quinoline, 11,12 rhodamine, 13,14 naphthyl, 15,16 pyrenyl, 17,18 fluorenyl, 19,20 and diformyl 21,22 influence the emission energy, intensity, pattern, and the molecules might serve as sensitive detectors of ions/molecules.…”