Solid state dual emissive binuclear Cobalt (II) azomethine complexes: Synthesis, characterization, thermal stabilities and photoluminescence studies
Document Type
Article
Publication Date
2-15-2023
Abstract
Two new binuclear Co(II) azomethine complexes were synthesized from diaminodiphenylsulphide bridged ligands bearing NO2 and Cl substituents. Structural interpretation was carried out through el-emental analysis (CHNS), nuclear magnetic resonance (NMR), fourier transform infra-red (FTIR), powder X-ray diffraction (PXRD), energy dispersive X-ray diffraction (EDX), UV-Visible and photoluminescence spectroscopy. The ligands involve dinitrogen and dioxygen donor atom system as observed in the FTIR and NMR spectra, forming binuclear CoHLa and CoHLb complexes upon coordination. The powder X-ray diffraction analysis specified the occurrence of crystalline phase in CoHLb while amorphous in CoHLa. Both the Co(II) complexes displayed dual emissions in the visible and near infra-red region. These are the first and prime examples of the dual emissive binuclear Co(II) complexes that display solid state photo-luminescence with a Stoke's Shift (A lambda) values of 307 and 308 nm, revealing thermal stability exceeding 300 degrees C. These properties worth's the complexes as favorable luminescent materials in solid state.(c) 2022 Elsevier B.V. All rights reserved.
Keywords
Co(II), Azomethine, Dual emissive, Near infra-red, Thermal stabilities
Divisions
CHEMISTRY
Funders
FRGS (Grant No: FP071-2018A),PRGS (Grant No: PR003- 2018A),University Malaya Centre for Ionic liquids (UMCiL),Higher Education Commission of Pakistan
Publication Title
Journal of Molecular Structure
Volume
1274
Issue
1
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS