Comparative optical studies of naphthalene based Schiff base complexes for colour tunable application

Two Schiff base ligands were synthesized by the chemical reaction of 2,3-diaminonaphthalene with salicylaldehyde (HL1) and 2,3-diaminonaphthalene with 2-hydroxy-1-naphthaldehyde (HL2). The ligand HL2 have an additional phenyl group in the structure compared to HL1. This additional phenyl group in th...

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Bibliographic Details
Published in:Materials chemistry and physics 2019-02, Vol.224, p.314-319
Main Authors: Gondia, N.K., Sharma, S.K.
Format: Article
Language:English
Subjects:
Absorption
Blue shift
Charge transfer
Chemical reactions
Chemical synthesis
Coordination compounds
Energy gap
Fluorescence
Imines
Ligands
Molecular orbitals
Molecular parameters
Molecular structure
Naphthalene
Optical properties
Order parameters
Organic chemistry
Parameter estimation
Photometry
Schiff base
Zinc
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Summary:Two Schiff base ligands were synthesized by the chemical reaction of 2,3-diaminonaphthalene with salicylaldehyde (HL1) and 2,3-diaminonaphthalene with 2-hydroxy-1-naphthaldehyde (HL2). The ligand HL2 have an additional phenyl group in the structure compared to HL1. This additional phenyl group in the molecular structure is expected to modify the optical and photometric properties of the ligand. The complexation of Zn metal ions with ligands occur via N-azomethine followed by the deprotonation of OH group. The complexes HC1 and HC2 were characterized by FTIR, HNMR, UV-VIS and PL techniques. The optical properties like absorption and fluorescence were studied to get the idea about the transitions among molecular orbitals as well as quantum yield. The complex having an additional phenyl group shows a blue shift in emission wavelength with an improvement in quantum yield. HOMO-LUMO energy gap along with some molecular parameters were estimated in order to know the chemical reactivity as well as to understand charge transfer process in the ligands and complexes. •Synthesis of two naphthalene based Schiff base ligands and zinc metal complexes by condensation reaction.•Systematic structural, optical and theoretical studies of ligands and complexes.•Optical properties are dependent on the presence of additional phenyl group.•Fluorescence studies and theoretical calculations support its application in electroluminescent devices.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2018.12.014