Browsing by Author "Vishnu D. Gupta"

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A structural study on gallium and indium β-diketonates
(2002) Subrato Bhattacharya; Sudha Singh; Vishnu D. Gupta
In an attempt to prepare pentacoordinate chlorobis(β-diketonato) gallium(III) and indium(III) complexes only the corresponding tris-products, Ga(PhCOCHCOPh)3 (1), Ga(tBuCOCHCOtBu) 3 (1a), and In(PhCOCHCOPh)3 (2), could be isolated. The crystal and molecular structures of 1 and 2 were determined. Both the complexes were found to have triclinc crystal system, with P1 space group. Cell parameters: 1 - a = 9.913(3) Å, b = 10.534(6) Å, c = 18.05(2) Å, α = 93.86(5)°, β = 94.40(4)°, γ = 106.58(4)°, V = 1805(2) Å3 z = 2; 2 - a = 10.507(3) Å, b = 11.448(3) Å, c = 16.322(4) Å, α = 107.38(2)°, β = 97.38(2)°, γ = 102.23(2)°, V = 1792(1) Å 3, z = 2.
Arsenic(III), Antimony(III) and Bismuth(III) Thiobenzoates: Crystal and Molecular Structures of M(SOCR)3 and PhSb(SOCPh)2
(Verlag der Zeitschrift fur Naturforschung, 1998) Prit Singh; Sudha Singh; Vishnu D. Gupta; Heinrich Nöth
Tris-thiobenzoates of arsenic, antimony and bismuth, M(SOCR)3 have been obtained from their oxides and characterized. In the X-ray crystal structure determinations of these, the group 15 atom and the three covalently bonded sulfur atoms are found to constitute a trigonal pyramid, the central atoms lie at a C3 axis. In the bismuth complex the thiobenzoate ligand tends to chelate. However, three comparatively short intermolecular M-S interactions are significant features for these molecules resulting in slacking of trigonal prisms providing an essentially six coordinate environment around arsenic and antimony and a nine-coordinate one for bismuth. The structure of PhSb(SOCPh)2 can be considered to be distorted trigonal bipyramidal.
Di– and Triorganotin(IV) Trifluoro-β-Diketonates
(1988) Channareddy Sreelatha; Vishnu D. Gupta
Organotin(IV) trifluoro– β-diketonates of the type R2Sn(CF3COCHCOR1)2and R3Sn(CF3COCHCOR1) [R = Me, Bunor Ph; R1= Me, Et, BuiPrior But] have been synthesized and characterized and their structures have been inferred from elemental analysis, molecular weight and spectral data. © 1988, Taylor & Francis Group, LLC. All rights reserved.
Indium derivatives of monothio-β-diketones and the X-ray structure of tris[benzoyl(thiobenzoyl)methanato-O,S]indium(III)
(1985) Channareddy Sreelatha; Vishnu D. Gupta; Chaitanya K. Narula; Heinrich Nöth
Six-co-ordinated mono-, bis-, and tris-(monothio-β-diketonates) of iridium(III) have been synthesized and characterized. The X-ray crystal structure of the title compound reveals a distorted octahedral geometry with facial arrangement of the sulphur and oxygen ligand atoms.
Neutral five-co-ordinate gallium(III) and indium(III) complexes derived from sulfur ligands
(Royal Society of Chemistry, 1996) Subrato Bhattacharya; Neena Seth; Dileep K. Srivastava; Vishnu D. Gupta; Heinrich Nöth; Martina Thomann-Albach
Five-co-ordinated gallium(III) and indium(III) complexes, GaCl[PhC(S)CHC(O)Ph]2, GaCl(S2CNR2)2 (R = Me, Pri or NR2 = pyrrolyl) and InCl(S2CNPri2)2, have been synthesized and characterized. X-Ray crystallographic studies revealed a trigonal-bipyramidal structure for GaCl[PhC(S)CHC(O)Ph]2 and square-pyramidal structures for GaCl(S2CNMe2)2 and InCl(S2CNPri2)2. Also, Ga(S2CNC4H4)3 has been synthesized. Its molecular structure shows a GaS6 core approaching a trigonal-prismatic geometry.
Neutral five-coordinate gallium(III) and indium(III) complexes from sulphur ligands
(Springer India, 1996) Subrato Bhattacharya; Vishnu D. Gupta
[No abstract available]
Notizen / Notes. Investigation on the Product from Monobutyltin(IV) Compounds and Benzoyl(thiobenzoyl)methane: a 1,3,2λ5,4λ5‐Dithiadistannetane
(1991) Neena Seth; Vishnu D. Gupta; Gerald Linti; Heinrich Nöth
Butyltin triisopropoxide reacts with benzoyl(thiobenzoyl)methane (LH) to yield BuSn(S)L and an organic sulfide 2 instead of the expected BuSnL3. The use of other butyltin(IV) starting materials invariably leads to the same products. From an X‐ray structure determination the tin sulfido complex is found to be a centrosymmetric dimer, [BuSn(S)L]2 (1) with a planar four‐membered Sn2S2 ring containing pentacoordinated tin atoms. Copyright © 1991 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
Preparation and characterization of diorgano- and dihalogeno-bis(monothio-β-diketonato)tin(IV) complexes. Crystal and molecular structures of SnY2(btbm)2 and SnY2(tacac)2 (Y = Me or Cl)
(1988) Channareddy Sreelatha; Dileep K. Srivastava; Vishnu D. Gupta; Heinrich Nöth
Diorgano- and dihalogeno-bis(monothio-β-diketonato)tin(IV) complexes have been prepared and their structures partially deduced by i.r. and n.m.r. data. In order to ascertain structural conclusions, X-ray crystal structure analyses were performed on the complexes SnMe2(btbm)2 [Hbtbm = benzoyl(thiobenzoyl)methane] and SnMe2(tacac)2 (Htacac = monothioacetylacetone), as well as their dichlorotin(IV) analogues, SnCl2(btbm)2 and SnCl2(tacac)2. The tin atoms in SnMe2(btbm)2 and SnMe2(tacac)2 show a strongly distorted octahedral environment with pairs of the same donor atoms (O, S) in the cis position. The two methyl groups deviate strongly from the trans position, C-Sn-C bond angles being 134.2 and 139.4° respectively. Comparatively long Sn-O bond distances reveal the anisobidentate nature of the ligand. In contrast, the dichloro complexes SnCl2(btbm)2 and SnCl2(tacac)2 exhibit octahedral geometries, the Cl-Sn-Cl bond angles being only 95.3 and 98.5° respectively, with the chlorine atoms in cis positions and the sulphur atoms in trans positions. The oxygen atoms show normal Sn-O bond lengths.
Reinvestigation of the synthesis of tris[benzoyl(thiobenzoyl)methanato-S]arsenic(III): Synthesis and X-ray structure of 3,3′-thiodi(1,3-diphenylprop-2-en-1-one)
(1988) Rajendra P. Singh; Vishnu D. Gupta; Eileen N. Duesler; Chaitanya K. Narula
Tris[benzoyl(thiobenzoyl)methanato-S]arsenic(III), prepared by the reaction of arsenic trichloride with benzoyl(thiobenzoyl)methane, appears to be essentially tetrahedral, involving only sulphur-bonded ligands. Under reflux, the Z,Z isomer or 3,3′-thiodi(1,3-diphenylprop-2-en-1-one) is obtained exclusively as confirmed by a single-crystal X-ray analysis.
Structural studies on indium and tin thiobenzoates
(1996) P. Singh; S. Bhattacharya; Vishnu D. Gupta; Heinrich Nöth
Indium(III) and tin(IV) thiocarboxylates were prepared and characterized on the basis of their IR, 13C- and 19Sn-NMR data. Indium tris(thiobenzoate) (1) decomposes into a sulfido complex In(S)(S(O)CPh] (2a). The corresponding tris(thioacetate) In[S(O)CMe]3 is thermally too unstable to be isolated. The anionic tetrakis complex [Et3NH]iIn[S(O)CPh]4) (3) was characterized by X-ray crystallography which revealed a distorted tetrahedral coordination at the In atom. X-ray diffraction analysis of the complexes BuSn[S(O)CPh]3 (4) and Cl2Sn[S(O)CPh]2 (7) showed distorted tetrahedral and tis-octahedral structures, respectively. © VCH Veriagsgesellschaft mbH, 1996.
Structural studies on some trifluoro-β-diketonates of tin(IV) and lead(II)
(2002) Sudha Singh; Vishnu D. Gupta
Organotin(IV), tin(IV) and lead(II) trifluoro-β-diketonates have been prepared and characterized on the basis of IR. 1H and 13C NMR data. All the organotin(IV) complexes are thermally stable liquids. SnCl2(CF3COCHCOPh)2 (7) is characterized by X-ray crystallography which reveals a distorted cis-octahedral structure. X- ray diffraction analysis of Pb(CF3COCHCOC6H4-p-Cl)2 (8) shows a highly distorted trigonal bipyramidal structure.
Synthesis and characterization of the heterometallic aggregate Pb2Al5(μ3-O)(μ4-O)(μ-OiPr)9(OiPr)3(μ-OAc)3
(Wiley-VCH Verlag, 1999) Ashutosh Pandey; Vishnu D. Gupta; Heinrich Nöth
A novel heterometallic aggregate Pb2Al5(μ3-O)(μ4-O)(μ- OiPr)9(OiPr)3(μ-OAc)3 obtained from the interaction of Pb(OAc)2 and Al(O-iPr)3 is the first structurally characterized example based on lead and aluminum. This compound has been isolated in high yield and examined by 1H-, 13C-, and 27Al NMR, and in the solid state by X-ray crystallography.
Synthesis and molecular structure of tin(IV) 1‐pyrrolecarbodithioates
(1992) Neena Seth; Vishnu D. Gupta; Heinrich Nöth; Martina Thomann
The 1‐pyrrolecarbodithioate complexes of tin, PhSnCl(S2CNC4H4)2 (1) and Sn(S2CNC4H4)4 (2) have been synthesized and characterized by IR and NMR spectra (1H, 13C and 119Sn). δ119Sn suggests hexacoordination for 1 and an even higher coordination number for 2. X‐ray structure determinations of these as well as of Me2Sn(S2CNC4H4)2 (3) have shown that 3 is one of the few known examples with a skew‐trapezoidal bipyramidal configuration. 1 attains approximately a cis‐octahedral geometry with two bidentate carbodithioate ligands with the Cl atom and the phenyl group in cis position. Complex 2 possesses two bidentate ligands while the other two are essentially anisobidentate leading to a structure between an octahedraon and a dodecahedron. Copyright © 1992 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
Synthesis and molecular structure of tris(benzoyl-thiobenzoyl-methanato-O,S) bismuth(III)
(1992) Anil K. Mishra; Vishnu D. Gupta; Gerald Linti; Heinrich Nöth
The title bismuth(III) complexes, Bi[C6H5C(S)CHC(O)C6H4X]3 (X = H, OMe, Cl in para position) have been synthesized and characterized. The crystal and molecular structure of the complex Bi[C6H5C(S)CHC(O)C6H5]3 has been determined. It crystallizes in the triclinic space group P1. The molecule associates to a loosely held dimer through a weak BiS interaction forming a highly asymmetrical four-membered Bi2S2 bridge structure. © 1992.
Synthesis and Structure of Organotin(IV) Complexes of Maltol
(1994) Subrato Bhattacharya; Neena Seth; Vishnu D. Gupta; Heinrich Nöth; Kurt Polborn; Martina Thomann; Holger Schwenk
Synthese und Struktur von Organozinn(IV)‐Komplexen von Maltol
Synthesis, characterization, and crystal structures of tin(IV) 1-pyrrolethiocarboxylates
(1988) Dileep K. Srivastava; Vishnu D. Gupta; Heinrich Nöth; Wilfried Rattay
Tin 1-pyrrolecarbothioates (1-pyrrolethiocarboxylates) SnR4-nLn (L = OSCNCH=CHCH=CH, n = 1-4) have been synthesized and characterized by i.r., n.m.r. (1H, 13C, and 119Sn), and 119Sn Mössbauer spectral studies. X-Ray crystal and molecular structure analyses were performed on the compounds SnPh3L, SnMe2L2, SnPhL3, and SnL4. The triphenyltin complex is tetrahedral with a sulphur-bonded ligand. The bis complex can be considered to be essentially tetrahedral or as highly distorted octahedral if very weak Sn-O interactions (average bond length 2.65 Å) are taken into account. The phenyltin tris complex contains a seven-co-ordinated tin atom in a distorted pentagonal-bipyramidal environment with all the three ligands bound to the tin in an anisobidentate fashion (average Sn-O 2.506 Å). The complex SnL4 shows a distorted-octahedral co-ordination geometry with two thiocarbamates functioning as bidentate chelates, the other two as monodentate ligands through the sulphur atom. In solution, these structures are essentially retained, as indicated by the n.m.r. spectral features.
The Crystal and Molecular Structure of Dichloro Monothiodibenzoylmethanato Indium Monothiodibenzoylmethane InCl2L(LH)
(1986) Anil K. Mishra; Vishnu D. Gupta
Indium trichloride reacts with 2 moles of monothiodibenzoylmethane (LH) in the presence of sodium acetate to yield InCl2L(LH). According to an X-ray structure analysis the molecule possesses a hexacoordinated indium atom with two chlorine atoms in cis position and two sulfur atoms in trans position. The symmetry of the molecule is C2 imposed by a crystallographic twofold axis. The unique hydrogen atom, assumed to form an intermolecular hydrogen bridge between oxygen atoms could not be detected in the structure analysis. © 1986, Verlag der Zeitschrift für Naturforschung. All rights reserved.
Tris(benzoyl-thiobenzoyl-methanato-O, S)indium, a Conformer of a Facial Isomer
(1989) Vishnu D. Gupta; Anil K. Mishra; Heinrich Nöth; Kurt Polborn
A second modification of the title compound has been isolated and characterized by an X-ray structure analysis. It crystallizes in the monoclinic space group P21/c. The indium atom is hexacoordinated and surrounded by three sulfur and three oxygen atoms in a facial arrangement as has been found for a previously known isomer. However, the phenyl groups adopt a different orientation, hence it is a rotamer. © 1989, Verlag der Zeitschrift für Naturforschung. All rights reserved.