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Contreras RH, Gavarini HO, Natiello MA. The through-space transmission of 77Se - 77Se coupling constants. J Comput Chem 2011. [DOI: 10.1002/jcc.540080306] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Scharfenberg P. CNDO/2-Molekülgeometrieberechnungen unter Einbeziehung von d-Orbitalen (Cl-, Br-, I- und Schwefelverbindungen als Beispiele). ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19770171028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Eichele K, Wasylishen RE, Schurko RW, Burford N, Whitla WA. An unusually large value of 1J(31P,31P) for a solid triphenylphosphine phosphadiazonium cationic complex: determination of the sign of J from 2D spin-echo experiments. CAN J CHEM 1996. [DOI: 10.1139/v96-264] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Phosphorus-31 NMR spectra of a solid triphenylphosphine phosphadiazonium salt, [Mes*NP-PPh3][SO3CF3], have been acquired at 4.7 and 9.4 T. Analysis of the spectra obtained with magic-angle spinning indicates that the two phosphorus nuclei are strongly spin–spin coupled, [Formula: see text], despite the unusually long P—P separation, rP,P = 2.625 Å. Two-dimensional spin-echo spectra provide convincing evidence that 1J(31P,31P) is negative. Semi-empirical molecular orbital calculations at the INDO level support the negative sign for 1J(31P,31P). A large span, 576 ppm, is observed for the chemical shift tensor of the two-coordinate phosphorus centre (δ11 = 307 ppm, δ22 = 174 ppm, δ33 = −269 ppm), which is very similar to the value previously reported for the non-coordinated phosphorus centre in the free Lewis acid, [Mes*NP][AlCl4]. The principal components and orientations of the phosphorus shielding tensors of these compounds are compared with those calculated for [HNP]+ and its phosphine adduct using the ab initio Gauge-Including Atomic Orbitals method. The phosphorus chemical shift tensor of the triphenylphosphine moiety has a relatively small span of 33 ppm. Key words: spin–spin coupling constants, solid-state NMR, 31P NMR, MO calculations, phosphadiazonium cation, P—P bonds.
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Polarization propagator analysis of the through space transmission of spin—spin coupling constants by overlap of lone pairs. J Mol Struct 1993. [DOI: 10.1016/0022-2860(93)87040-g] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Contreras R, de Azúa M, Giribet C, Aucar G, de Bonczok R. Viewpoint 8 — polarization propagator analysis of spin-spin coupling constants. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0166-1280(93)87009-3] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Aucar G, Contreras R. New method to study spin-spin coupling constants involving heavy nuclei at the MNDO-RPA level with localized orbitals. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0022-2364(91)90018-o] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rotational isomerism and barriers to internal rotation in 3-halopropenes byscf-mo methods. J CHEM SCI 1986. [DOI: 10.1007/bf02895732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Sándor P, Radics L. SCPT-INDO calculation of coupling constants in five- and six-membered chalcogen heteroaromatics. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0166-1280(85)85011-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Barfield M, Facelli J, Della E, Pigou P. Natural-abundance studies of 13C13C coupling constants. Substituent dependencies of directly bonded and vicinal 13C13C coupling constants in 1-substituted bicycloalkanes. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0022-2364(84)90173-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Galasso V. Theoretical study of electron affinities, ionization potentials and photoionization cross-sections of chalcogen heterocyclopentadienes. ACTA ACUST UNITED AC 1982. [DOI: 10.1016/0166-1280(82)80196-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Theoretical study of the chalcogen—Carbon coupling constants in the chalcogen heterocyclopentadienes. J Mol Struct 1982. [DOI: 10.1016/0022-2860(82)90203-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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INDO characterization of α-halogen interaction in planar radicals from irradiated 5-halouracils. ACTA ACUST UNITED AC 1980. [DOI: 10.1016/0022-2364(80)90001-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Giezendamner D, Sengupta S, Litzistorf G. Automation of a pulsed FT NQR spectrometer with increased s/n ratio and resolution for zeeman studies of single crystals. J Mol Struct 1980. [DOI: 10.1016/0022-2860(80)85053-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Scharfenberg P. Invariance criteria and symmetry conservation rules for geometry optimizations. Theor Chem Acc 1979. [DOI: 10.1007/bf00550282] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Galasso V, Pellizer G, Lisini A, Bigotto A. The proton magnetic resonance of heterocyclic diketones. ACTA ACUST UNITED AC 1975. [DOI: 10.1002/mrc.1270071206] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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A theoretical investigation into σ and π contributions to JHH couplings in chalcogen heterocyclics. Chem Phys Lett 1975. [DOI: 10.1016/0009-2614(75)85179-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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