scispace - formally typeset
Search or ask a question
Author

A. K. Saxena

Bio: A. K. Saxena is an academic researcher from University of Lucknow. The author has contributed to research in topics: Bromide & Antimony. The author has an hindex of 7, co-authored 17 publications receiving 146 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, it was shown that (C6F5)3SbCl2 with appropriate metallic salts yield covalent pentacoordinate disubstituted products (V, VII-XII) of the general formula, (C 6F5, 3SbY2 (Y = NCS, NCO, −ONCMe2, −onCMePh −NCO(CH 2 ) 2 C O and p-NO2C6H4OCO), which are also accessible by displacement reaction of (I or (II

35 citations

Journal ArticleDOI
TL;DR: In this article, penta-coordinated triaryl-arsenic(V) complexes of Schiff bases of the general formula Ar3AsL (Ar = C6H5, p-CH3C6H4, pclC 6H4 and p-FC6H 4) have been synthesized along with some triarylantimony complexes with similar tridentate ligands.
Abstract: Hitherto unreported penta-coordinated triaryl-arsenic(V) complexes of Schiff bases of the general formula Ar3AsL (Ar = C6H5, p-CH3C6H4, p-ClC6H4, p-FC6H4 and C6F5; L = dibasic tri-and tetradentate ligands with ONO and ONNO systems) have been synthesised along with some triarylantimony complexes with similar tridentate ligands. The complexes, which are yellow crystalline solids, have been characterised by elemental analyses, IR, 1H and 19F NMR spectral data sp3d and sp3d2 hybridisation has been suggested for the arsenic and antimony derivatives, respectively, on the basis of spectral data.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the redistribution reactions with SbCl3 in 2 1 and 1 2 molar ratios were found to give quantitative yields of (C6F5)2SbCl (II) (c6F 5)SbCL2 (III), respectively.

21 citations

Journal ArticleDOI
TL;DR: Several new pentacoordinated, triorganoantimony bis-selenocyanates have been synthesized from potassium selenocyanate and the corresponding organo-antimony halide (chloride and/or bromide) in the presence of the phase-transfer catalyst 18-crown-6, and characterized Spectroscopic evidence suggested an iso structure (Sb-NCSe) as mentioned in this paper.

16 citations

Journal ArticleDOI
TL;DR: Several substituted tertiaryarylantimony (V) complexes of Schiff bases having the formula, R3SbL (R[dbnd]p-FC6H4, C6F5 and p-CH3C6H 4, with ONNO donor system have been prepared as discussed by the authors.
Abstract: Several new substituted tertiaryarylantimony (V) complexes of Schiff bases having the formula, R3SbL (R[dbnd]p-FC6H4, C6F5 and p-CH3C6H4; L[dbnd]Dibasic tetradentate ligand with ONNO donor system have been prepared. The complexes are yellow to orange in colour. These complexes have been characterised by elemental analysis, IR and PMR spectral data. A pentagonal bipyramidal structure having seven coordination around antimony has been suggested for these complexes.

11 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: New divalent osmium complexes that feature strong red metal-to-ligand-charge-transfer (MLCT) phosphorescence and electrophosphorescence and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PBD) are reported.
Abstract: We report new divalent osmium complexes that feature strong red metal-to-ligand-charge-transfer (MLCT) phosphorescence and electrophosphorescence. The general formula of the complexes is Os(II)(N−N)2L−L, where N−N is either a bipyridine or a phenanthroline and L−L is either a phosphine or an arsine. New polypyridyl ligands synthesized are 4,4‘-di(biphenyl)-2,2‘-bipyridine (15) and 4,4‘-di(diphenyl ether)-2,2‘-bipyridine (16), and the 1,10-phenanthroline derivatives synthesized are 4,7-bis(p-methoxyphenyl)-1,10-phenanthroline (17), 4,7-bis(p-bromophenyl)-1,10-phenanthroline (18), 4,7-bis(4‘-phenoxybiphen-4-yl)-1,10-phenanthroline (19), and 4,7-bis(4-naphth-2-ylphenyl)-1,10-phenanthroline (20). 4,4‘-Diphenyl-2,2‘-bipyridine (21) and 4,7-diphenyl-1,10-phenanthroline (22) were also used in these studies. Strong π-acid ligands used were 1,2-bis(diphenylarseno)ethane (23), cis-1,2-bis(diphenylphosphino)ethylene (24), and cis-1,2-vinylenebis(diphenylarsine) (25). Ligand 25 is used for the first time in these typ...

209 citations

Patent
22 Dec 2005
TL;DR: In this article, the present invention relates to a doped organic semiconductor material comprising an organic matrix material which is doped with at least one heteromonocyclic and/or heteropolycyclic compound.
Abstract: The present invention relates to a doped organic semiconductor material comprising an organic matrix material which is doped with at least one heteromonocyclic and/or heteropolycyclic compound, the compound having at least one nitrogen atom with a free electron pair.

128 citations

Journal ArticleDOI
TL;DR: In this article, the 1:2 molar condensation of o-phenylenediamine with salicyldhyde, 2-hydroxy-1-naphthaldhyde or o-hydroxacetophenone was studied.
Abstract: Three ligands have been formed by the 1:2 molar condensation of o-phenylenediamine with salicyldhyde, 2-hydroxy-1-naphthaldhyde or o-hydroxyacetophenone. The potentially tetradentate ligands are N,N′-bis(salicyldhyde)-o-phenylenediamine(SalophH2), N,N′-bis(2-hydroxy-1-naphthaldhyde)-o-phenylenediamine (NophH2) and N,N′-bis(o-hydroxyacetophenone)-o-phenylenediamine (AophH2), respectively. These ligands form complexes (1:1 molar ratio) with nickel, copper and zinc ions. The complexes have been characterized by IR, 1HNMR, MS, uv/vis spectra in addition to elemental analysis. The spectral data of the ligands and their complexes with nickel, copper and zinc are discussed in connection with the structural changes which occur due to complexation.

116 citations

Journal ArticleDOI
TL;DR: The chiral stationary phase for organic synthesis showed good chiral recognition ability towards various racemates including polymethine, chlorine, cadmium, and phosphorous.
Abstract: for Organic Synthesis Valentine G. Nenajdenko,*,†,§ Vasiliy M. Muzalevskiy,† and Aleksey V. Shastin†,‡ †Department of Chemistry, Moscow State University, Leninskie Gory, Moscow 119992, Russia ‡The Institute of Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Chernogolovka, Moscow Region 142432, Russia A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS), 119991, GSP-1, Moscow, V-334, Vavilova St. 28, Russia

111 citations

Journal ArticleDOI
TL;DR: In this paper, cyclopropanation reactions, intramolecular cyclizations, and fluorination of cycloprocessanecarboxylic acids are discussed.

96 citations