60484-29-9Relevant articles and documents
Heteroleptic Zn(II) Complexes: Synthesis, Characterization and Photoluminescence Properties
Solanki, Jaydip,Surati, Kiran
, p. 865 - 875 (2019)
Heteroleptic Zn (II) complexes containing 8-hydroxy quinoline as preliminary ligand and pyrazolone based derivatives as secondary ligand were synthesized and their structures confirmed by NMR, Mass, FT-IR, UV-vis and Elemental analysis. Theses complexes s
Theoretical and experimental study of triphenylphosphonium Schiff base of 5-hydroxy-3-methyl-1-phenyl-4-formylpyrazole
Borodkin, Sergey A.,Popov, Leonid D.,Tsaturyan, Arshak A.,Milenkovi?, Milica R.,Shcherbakov, Igor N.,Lukov, Vladimir V.
, p. 375 - 381 (2018)
The Schiff base (HLBr), containing a chelating unit and triphenylphosphonium moiety has been synthesized in the reaction of 4-aminobenzyl(triphenyl)phosphonium bromide with 5-hydroxy-3-methyl-1-phenyl-4-formylpyrazole. The composition and structure of HLBr have been determined by elemental analysis, IR, 1D and 2D NMR, electronic spectroscopy and mass spectrometry. Density functional theory (DFT) calculations (6-311G(d,p) level of theory) have been carried out to investigate tautomeric forms of HL+ and the reaction mechanism of its formation and spectral properties. The most stable form in the solid state and in DMSO solution is pyrazolone (keto-amine) tautomeric form.
Highly-efficient solution-processed deep-red organic light-emitting diodes based on heteroleptic Ir(III) complexes with effective heterocyclic Schiff base as ancillary ligand
Dubey, Deepak Kumar,Jou, Jwo-Huei,Prajapati, Meha J.,Solanki, Jaydip D.,Surati, Kiran R.,Swayamprabha, Sujith Sudheendran,Yadav, Rohit Ashok Kumar
, (2020)
Three new deep-red heteroleptic phosphorescent iridium(III) complexes Ir(piq)2(L1), Ir(piq)2(L2), and Ir(piq)2(L3), comprising cyclometalated ligand 1-pheynylisoquionoloine(piq) and heterocyclic Schiff base ancillary ligands 3-methyl-1-phenyl-4-(phenylimino)methyl-1H-pyrazol-5-ol(L1), 3-methyl-1-phenyl-4-(phenylimino)methyl-1H-pyrazol-5-ol (L2), and 4-(4-methoxyphenyl)imino-methyl-3-methyl-1-phenyl-1H-pyrazol-5-ol (L3) have been designed, synthesized, and characterized. All the compounds emit deep red emission with λmax values in the spectral range of 602–620 nm, high quantum yield 0.44 to 0.52 and short excited state lifetime τ (0.51–0.55 μs) due to dominant strong field ligands, resulting an efficient triplet metal-ligand charge transfer (3MLCT) excited state. Time dependent density functional theory (TD-DFT) calculations and electrochemical measurements of the compounds strongly support their genuine deep red phosphorescent emission. The combination of ancillary and cyclometalated ligands significantly influence the molecular orbitals of Ir(III) complex, leading to clearly distinct electron density distributions of the LUMO and HOMO. The compounds show good thermal stability and quantum yield, these characteristics making them an ideal candidate to exploit in phosphorescent organic light emitting diodes (PhOLEDs). Highly-efficient PhOLEDs were developed by using Ir(piq)2(L1), Ir(piq)2(L2), and Ir(piq)2(L3) in solution process as deep red emitters and device composed of Ir(piq)2(L3) exhibited an excellent external quantum efficiency of 14.9percent and current efficiency of 10.8 cd/A with the stable CIE coordinates of (0.67,0.33).
Photoluminescent properties of novel design heteroleptic Zn(II) complexes
Vamja, Atul C.,Surati, Kiran R.
, p. 1197 - 1202 (2017/09/30)
Three novel heteroleptic Zn(II) complexes containing 8-hydroxy quinoline and various pyrazolone-based derivatives were synthesized and their structures confirmed by 1H–nuclear magnetic resonance, mass spectrometry, Fourier transform infra-red spectroscopy, UV–vis analysis and element analysis. All three complexes showed good photoluminescence properties in the solid state and in solution in the maximum emission range from 475 to 490?nm with a quantum yield of 0.45 to 0.51. Absorption spectra revealed that the complexes possessed a maximum absorption range of 272–281?nm with a band gap of 2.59–2.68?eV. The highest occupied molecular orbital and lowest unoccupied molecular orbital of all the complexes were determine by cyclic voltammetry. All complexes displayed high thermal stability. These characteristics were assessed to find suitability for an alternative cheap light emitter for organic light-emitting diodes.
A rhodamine-based sensor for Hg2+ and resultant complex as a fluorescence sensor for I-
Ding, Haichang,Zheng, Chunhong,Li, Baoqiang,Liu, Gang,Pu, Shouzhi,Jia, Dechang,Zhou, Yu
, p. 80723 - 80728 (2016/09/09)
The recognition and sensing of ions have attracted growing attention because of the important role played by ions in biological, industrial and environmental processes. However, many sensors can only detect a single ion. We report here a rhodamine-based sensor with functions of dual ion detection. It displays a quick colorimetric and fluorometric sensing ability on 1 : 1 binding to Hg2+, with a change of color of solution (colorless to pink) and fluorescence color (dark to orange) due to Hg2+-induced opening of the spirolactam ring in the rhodamine structure. The detection limits were found to be 32 nM and 44 nM by absorption and fluorescence methods, respectively. More importantly, the resulting complex 1-Hg2+ can be used as a reversible fluorescence sensor for I-. With the addition of I-, the fluorescence intensity was quenched because Hg2+ in the complex was grabbed by I- attributed to the stronger binding force between Hg2+ and I-. Based on the "OFF-ON-OFF" behavior, a molecular device with "INHIBIT" logic gate function was constructed.
Studies of styrene oxidation by catalyst based on zeolite-Y nanohybrid materials
Desai, Nisheeth C.,Chudasama, Jiten A.,Karkar, Tushar J.,Patel, Bonny Y.,Jadeja, Krunalsinh A.,Godhani, Dinesh R.,Mehta, Jignasu P.
, p. 203 - 219 (2016/09/09)
Metal complexes of VO(IV), Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and HNIMMPP (4-(((2-hydroxy-5-nitrophenyl)imino)methyl)-3-methyl-1-phenyl-1H-pyrazol-5-ol) schiff base ligand have been synthesized within zeolite-Y along with neat one. Synthesized compounds were characterized by physico-chemical techniques such as elemental analysis of catalysts, BET, XRD, SEM, FT-IR, UV–vis, ICP-OES and TGA. Synthesized zeolite-Y based nanohybrid materials and their uncovered complexes were used in styrene oxidation with TBHP as an oxidizing agent. Oxidation reaction of styrene furnished benzaldehyde as the major product and styrene glycol, chalcone and 2-phenyloxirane as minor products. Amongst all catalysts, [VO(HNIMMPP)(H2O)]-Y produced the highest conversion at 93.35% and selectivity of benzaldehyde (45.70%) was the greatest. These nanohybrid materials can be easily reprocessed and recovered within these reaction parameters. The reaction mechanism for catalytically oxidized styrene is discussed in the present paper.
Synthesis, spectroscopy and biological investigations of manganese(III) Schiff base complexes derived from heterocyclic β-diketone with various primary amine and 2,2′-bipyridyl
Surati, Kiran R.
body text, p. 272 - 277 (2011/06/27)
The mixed ligand mononuclear complex [Mn(bipy)(HPMFP)(OAc)]ClO4 was synthesized by reaction of Mn(OAc)3·2H2O with HPMFP and 2,2′-bipyridyl. The corresponding Schiff base complexes were prepared by condensation of [Mn(bipy)(HPMFP)(OAc)]ClO4 with ethylenediamine, ethanolamine and glycine (where HPMFP = 1-phenyl-3methyl-4- formyl-2-pyrazolin-5one, bipy = 2,2′-bipyridyl). All the compounds have been characterized by elemental analysis, magnetic susceptibility, conductometry measurements and 1H and 13C NMR, FT-IR, mass spectrometry. Electronic spectral and magnetic susceptibility measurements indicate square pyramidal geometry around manganese(III) ion. The thermal stabilities, activation energy E*, entropy change ΔS *, enthalpy change ΔH* and heat capacity of thermal degradation for these complexes were determined by TGA and DSC. The in vitro antibacterial and antifungal activity of four coordination compounds and ligand HPMFP were investigated. In vitro activates of Bacillus subtillis (MTCC-619), Staphylococcus aureus (MTCC-96), Escherichia coli (MTCC-722) and Klebsiella pneumonia (MTCC-109) bacteria and the fungus Candida albicans (ATCC-90028) were determined. All the compounds showed good antimicrobial activity. The antimicrobial activities increased as formation of Schiff base.
