Nuclear quadrupole coupling in bis(tetracarbonylcobalt)tin compounds

Graybeal, Jack D.; Ing, Shen D.; Hsu, Martha W.

doi:10.1021/ic50085a051

Cited by 14 publications

(2 citation statements)

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“…Narrow series I–XXXVI of various complexes taken from the literature are given in Tables . The interpreting of NQR spectra on occasion involves difficulties.…”

Section: Resultsmentioning

confidence: 99%

NQR parameters of complexes and polarizability effect

Egorochkin

Кузнецова

Хамалетдинова

et al. 2012

Magnetic Reson in Chemistry

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The literature data on substituent influence on the nuclear quadrupole resonance frequencies (ν), quadrupole coupling constants (e(2) Qq ⋅ h(- 1) ), and asymmetry parameters (η) for 36 series of the H-complexes, charge-transfer complexes, transition metal complexes and other donor-acceptor complexes have been considered, using the correlation analysis. Generally the ν, e(2) Qq ⋅ h(- 1) , and η values were first established to depend on the inductive, resonance, polarizability, and steric effects of substituents. The presence or otherwise of certain effects as well as relation between their contributions are determined by the type of series. The polarizability effect owes its existence to the appearance of an excess charge on the indicator centre as a result of the complexation. The contribution of this effect ranges up to 75%.

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“…Narrow series I–XXXVI of various complexes taken from the literature are given in Tables . The interpreting of NQR spectra on occasion involves difficulties.…”

Section: Resultsmentioning

confidence: 99%

NQR parameters of complexes and polarizability effect

Egorochkin

Кузнецова

Хамалетдинова

et al. 2012

Magnetic Reson in Chemistry

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“…The nuclear quadrupole coupling constant, e2Qqzz/h, in MHz, and the electric field gradient asymmetry parameter, g = (qxxqyy)/+, can be redundantly computed by fitting the frequencies to the secular equations for Z = 9/2.18 Q is the nuclear quadrupole moment and qzz is the largest component of the EFG tensor. An g variation of 0 -1 causes only about a 15% increase in the (7) 20.85 (7) 20.44 (6) 23.50 (12) 22.94 (6) 21.78 (6) Compd v (~~B~) u("Br) 4 frequency. Cobalt-59 is an Z = 7 / 2 nucleus giving three NQR frequencies per inequivalent nucleus.…”

Section: Nqr Spectra and Structural Informationmentioning

confidence: 99%

A cobalt-59, indium-115, gallium-69, gallium-71, bromine-79, bromine-81, and chlorine-35 nuclear quadrupole resonance study of structure and bonding in four-coordinate gallium and indium compounds containing metal-metal bonds

Brill¹,

Miller²

1976

Inorg. Chem.

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Pure nuclear quadrupole resonance spectra are reported for a series of four-coordinate gallium and indium compounds having a s ligands cO(c0)4, Br, C1, THF, acac, and (CsHs)3PO. The 59C0, l151n, 69Ga, 71Ga, 79Br, 81Br, and 35Cl N Q R parameters when taken together and separately lead to qualitative structural inferences and a coherent picture of the ground-state electron distribution in these molecules. The 59C0 and 'lsIn coupling constants and the llsIn asymmetry parameters suggest that ligand angle changes in the In(II1) coordination sphere account for some of the trends. 59C0 asymmetry parameters suggest cobalt-indium (gallium) a bonding is not a major factor in these compounds. The presence of bridging and terminal halogens can be determined using '9Br, 81Br, and 35Cl NQR frequencies. The halogen frequency shifts are consistent with orbital population changes on indium a s evidenced by the 1151n coupling constants. The number of examples is limited but partial quadrupole splitting values for ligands derived from Sn(1V) Mossbauer spectra appear to predict the trends in In(II1) coupling constants. The EFG trends and carbonyl ir frequency shifts in Co(C0)4-In(Ga) bonds compared to (C0)4Co-Sn(Ge) bonds are entirely consistent but show vco to be much less sensitive than the electric field gradient to substitutions.

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