Author
Bansi L. Kalsotra
Bio: Bansi L. Kalsotra is an academic researcher from University of Texas at El Paso. The author has contributed to research in topics: Transition metal & Singlet fission. The author has an hindex of 3, co-authored 5 publications receiving 73 citations.
Topics: Transition metal, Singlet fission, Excited state, Oxalate, Biphenylene
Papers
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60 citations
TL;DR: In this paper, the pH-dependent shifts in their electronic absorption spectra were determined from the pH dependent shifts in the 0-0 phosphorescence bands measured in rigid aqueous solution at 77 K.
Abstract: — The lowest excited singlet-state dissociation constants (pKSa) of bromosubstituted pyridines, quinolines, and isoquinolines were determined from the pH-dependent shifts in their electronic absorption spectra The lowest excited triplet-state dissociation constants (pKTa) of bromosubstituted quinolines and 4-bromoisoquinoline were obtained from the shifts of the 0–0 phosphorescence bands measured in rigid aqueous solution at 77 K The pKSa values indicate that the basicity of these brominated nitrogen heterocycles is increased in the lowest excited singlet state by 2 to 10 orders of magnitude as compared with the ground state The pKTa values are found to be significantly different from the corresponding ground-state pKa values, indicating that the basicity of bromoquinolines is increased in the lowest excited triplet state by 17 to 30 pK units The enhancement of the excited singlet-and triplet-state basicity of brominated nitrogen heterocycle derivatives as compared with the unsuhstituted parent compounds is attributed to the increased electron-donor conjugative interactions of the bromine atom pπ orbitals with π orbitals in the lowest excited singlet and triplet state
7 citations
TL;DR: In this paper, the electronic absorption spectra of the holmium salts were recorded and the new compounds were characterized on the basis of their elemental analysis and their infrared spectra, which were obtained by the reaction of HoCl3·6H2O with the azaheterocycle and the hydrochloric acid in water.
3 citations
TL;DR: In this paper, nine uranium(VI) complexes of nitrogen-containing heterocycles were obtained by the reaction of uranyl chloride with the corresponding ligand and hydrochloric or oxalic acid in aqueous medium.
3 citations
TL;DR: The authors showed that cyclobutadithiophenes will be highly unstable, also in view of the considerable ring strain of biphenylene and cyclobuta's high ring strain.
Abstract: Synthesis of the four possible dithiophene analogs of biphenylene (1), viz, cyclobuta[1,2-b:3,4-d′]dithiophene (3), cyclobuta[1,2,-b:3,4-b′]-dithiophene (4), cyclobuta[1,2-b:3,4-c′]dithiophene (5), and cyclobuta-[1,2-c:3,4-c′]dithiophene (6) has been explored using several different approaches All these attempts have been unsuccessful similarly as the former efforts of Mc Omie and Wynberg Equally unsuccessful were the attempts to obtain the iron tricarbonyl complexes of these compounds which were thought to be more stable The HMO calculations carried out for cyclobutadithiophenes indicate that these four compounds will be highly unstable, also in view of the considerable ring strain
1 citations
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TL;DR: Pecoraro et al. as discussed by the authors used the SCF-Xα calculations of the electronic structure of cluster models of the first and second row transition metal sulfides to identify several electronic factors which appear to be related to the catalytic activity of the sulfides.
286 citations
119 citations
TL;DR: In this paper, the authors provide an overview of the heterogeneous HDN process and outline various homogeneous models for hydrodenitrogenation catalysis including binding modes of HDN substrates, catalytic hydrogenation processes and recent CN bond cleavage reactions of nitrogen heterocycles.
68 citations
TL;DR: In this article, different modes of bonding the metals to the most widely spread chelating [β-diketones, o-oxyazomethines, o -oxy(mercapto) derivatives of azoles and azines] and heteroaromatic ligands are generalized and systematized.
61 citations
60 citations