A5016146520- Lanthanide and Transition Metal Complexes
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Magnetism in coordination complexes
- Porphyrin and Phthalocyanine Chemistry
- Photochemistry and Electron Transfer Studies
- Luminescence and Fluorescent Materials
- Molecular Sensors and Ion Detection
- Luminescence Properties of Advanced Materials
- X-ray Diffraction in Crystallography
- Quantum Dots Synthesis And Properties
- Crystallization and Solubility Studies
- Pigment Synthesis and Properties
- Perovskite Materials and Applications
- Nanocluster Synthesis and Applications
- Synthesis and Properties of Aromatic Compounds
- Mineralogy and Gemology Studies
- Molecular Junctions and Nanostructures
- Metal-Organic Frameworks: Synthesis and Applications
- Metal complexes synthesis and properties
- Conducting polymers and applications
- Advanced Chemical Physics Studies
- Radioactive element chemistry and processing
- Organometallic Complex Synthesis and Catalysis
- Organic Light-Emitting Diodes Research
University of Kerala
2022-2023
National Institute for Interdisciplinary Science and Technology
2008-2022
Academy of Scientific and Innovative Research
2019-2021
The unique four-level photocycle characteristics of excited-state intramolecular proton transfer (ESIPT) materials enable population inversion and large spectral separation between absorption emission through their respective enol keto forms. This leads to minimal or no self-absorption losses, a favorable feature in acting as an optical gain medium. While conventional ESIPT with enol-keto tautomerism process are widely known, zwitterionic materials, particularly those high photoluminescence,...
A novel class of efficient visible light sensitized antenna complexes Eu3+ based on the use a highly conjugated β-diketonate, namely, 1-(4-biphenoyl)-3-(2-fluoroyl)propanedione (HBFPD) and 1,10-phenanthroline as an ancillary ligand has been designed, synthesized, characterized their photophysical properties (PL) investigated. PL measurement results indicated that suitably expanded π-conjugation in complex molecules makes excitation band red shift to region hence exhibit intense emission...
A novel class of efficient visible light sensitized antenna complexes Eu3+ based on the use a series highly conjugated β-diketonates, namely, 1-(1-phenyl)-3-(2-fluoryl) propanedione, 1-(2-naphthyl)-3-(2-fluoryl)propanedione, 1-(4-biphenyl)-3-(2-fluoryl) and 2,2′-bis(di-p-tolylphosphino)-1,1′-binaphthyl oxide as an ancillary ligand has been designed, synthesized, characterized their photophysical properties investigated. The coordination geometries typical were calculated using Sparkle/PM3...
A novel β-diketone ligand, 4,4,5,5,5-pentafluoro-3-hydroxy-1-(phenanthren-3-yl)pent-2-en-1-one (Hpfppd), which contains a polyfluorinated alkyl group, as well conjugated phenanthrene unit, has been synthesized and utilized for the construction of two new europium coordination compounds [Eu(pfppd)3(H2O)2] 1 [Eu(pfppd)3(tpy)] 2 (where tpy = 2,2′:6,6′′-terpyridine). The designed were characterized their solid-state photoluminescence (PL) properties examined. Notably, introduction highly moiety...
Our recently developed Eu3+ coordination compound, Eu(pfppd)3(tpy) [where Hpfppd = 4,4,5,5,5-pentafluoro-3-hydroxy-1-(phenanthren-3-yl)pentanedione and tpy 2,2′:6,6′′-terpyridine] exhibits significant quantum yield (Φoverall 41%) long 5D0 lifetime (880 μs) values under biologically relevant pH conditions (pH 7.4) when excited with visible light. Hence, the luminescent complex was examined for live cell imaging using rat embryonic heart line, H9c2. The ternary permeates into H9c2 cells...
Donating strength of typically used donors in dye-sensitized solar cells.
Color purity is a critical prerequisite for full color displays. Creation of deep-red phosphorescent materials with high PLQYs particularly challenging because the "energy gap law". Simultaneously achieving yielding solution processable Pt(II) complexes further complicates this challenge. In report, we developed high-yielding synthetic route to processable/deep-red complex rigid tetradentate structure, in which identified an octahedral Pt(IV) as major side product formed under standard...
Three metal-free organic D-π-A dyes with benzothieno[3,2-b]indole as electron donor, cyanoacrylic acid both acceptor and anchoring group benzene (BID-1), thiophene (BID-2) furan (BID-3) π-spacers were designed synthesized for application in dye-sensitized solar cells (DSSCs). A planar electron-rich heterocycle such offers better backbone rigidity improves charge transport properties comparison to indolo[3,2-b]indole previously reported from our group. Additionally, we a donor grafted longer...
Donor modifications, especially through N-annulation, for enhancing the structure–performance relationship of D–π–A systems DSSC applications.
Abstract The transmission of substituent effect through a variety spacers, that is to say, alkyl, alkenyl, alkynyl, phenyl, thiophenyl, and polyacene has been studied by modeling Y‐G‐X type molecular systems (Y: reaction center; G: spacer moiety; X: substituent) using B3LYP/6‐31G(d,p) density functional theory calculations. center always kept as C=C double bond the electrostatic potential (MESP) minimum ( V min ) observed for this showed subtle variation with respect changes in unit nature...
The significance of electron releasing groups at the donors D–π–A systems for improving donating strength and power conversion efficiency photosensitizers.
Abstract The structural and electronic features of bis(4‐dimethylaminophenyl)squaraine ( 1 ) has been studied using density functional BLYP/ cc‐pVTZ level theory. quinoid character is correlated to the partial double bond C‐NMe 2 (1.379 Å) C−O (1.236 bonds which leads accumulation positive charge on NMe groups negative carbonyl oxygen. Further, diagonal C1 C3 (2.086 C2 C4 (2.116 distances squaric ring indicated a 1,3 type C−C orbital interaction. Molecular electrostatic potential (MESP)...
Purpose As there is a strong inducement to develop new colored inorganic materials substitute the current industrial pigments that are based on toxic metals hazardous health and environment, purpose of this paper invent environmentally benign rare earth-based colorants as viable alternatives traditional pigment formulations. Herein, authors developed series earth having general formula Ca0.1 Ln0.9 PO4 ( Ln = Y , Pr mixed oxides, RE Di). After studying all optical properties, have gone for...