Nonequivalent tin coupling to anisochronous protons

Holloway, Clive Ε.; Kandil, S. A.; Walker, I.

doi:10.1021/ja00766a071

Cited by 21 publications

(3 citation statements)

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“…On the other hand, it was shown recently that diastereotopic methyl groups31 and anisochronic methylene protons32, bonded with tin atoms in several types of the molecules, have different spin-spin coupling constants with '°Sn nuclei. These facts were considered to be direct evidence for the angle dependence of J(' '9Sn--C-1H) 32.…”

Section: +638mentioning

confidence: 99%

Study of the Structure and Complexation of Organic and Inorganic Derivatives of Metals by Means of N.M.R. Spectroscopy of Heavy Nuclei

PETROSYAN

REUTOV

1974

Molecular Spectroscopy–XI

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Data are considered about the structure and complexation of many compounds of tin and mercury, obtained by the present authors and other investigators by means of n.m.r. spectroscopy of "9Sn and '99Hg. In the case of tin compounds important information can bc derived from thc values of chemical shifts ö(' '9Sn) and spin-spin coupling constants J("9SnC-'H), J("9Sn-C-'9F) and 3(1 '9Sn-' 3C). Conclusions about the structure and complexation of mcrcury compounds arc dcrived mainly from the spin-spin coupling constantsThe application of n.m.r. spectroscopy to the study of organic and inorganic derivatives of metals, the isotopes of which have necessary magnetic properties, was shown to be very productive from the viewpoint of information about the behaviour of these compounds in solution. This information is very important for solving the many problems of inorganic and organometallic chemistry. One such problem is the question about the effect of solvents upon the rates and mechanisms of inorganic and organometallic compounds'.A review about the p.m.r. spectra of different compounds of metals was published recently2. In the present work we are illustrating the possibilities of applying n.m.r. spectroscopy of heavy nuclei to the study of the structure and complexation of organic and inorganic derivatives of metals, using the data about the chemical shifts of "9Sn and '99Hg nuclei and their spinspin coupling constants with 'H, '3C and '9F for different compounds of tin and mercury. TIN COMPOUNDSIn 1961 Burke and Lauterbur3 studied ''9Sn n.m.r. spectra of eighteen organic and inorganic derivatives of tin and showed that ö( "9Sn) varied by 1850 ppm depending upon the structure of the molecules. It was assumed that such a large range of 5( '9Sn) values cannot be rationalized by changes in the diamagnetic term of the ''9Sn screening constant, but that it merely reflects 147

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Section: +638mentioning

confidence: 99%

Study of the Structure and Complexation of Organic and Inorganic Derivatives of Metals by Means of N.M.R. Spectroscopy of Heavy Nuclei

PETROSYAN

REUTOV

1974

Molecular Spectroscopy–XI

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“…14, NO. 3,1980 223 Normalized N T , values for a cross-section of the organotin derivatives are given in Table 3. Tetraphenyltin has spherical symmetry about the tin and can be taken as an example of an isotropically reorienting molecule in which all protonated carbons should relax at the same rate in the absence of internal or segmental motion.…”

Section: Spin Lattice Relaxation and Molecular Motionmentioning

confidence: 99%

A carbon‐13 NMR study of sterically hindered organotin derivatives

1980

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Proton and 13C NMR has been used to examine a series of organotin derivatives. Anisochronous shifts are reported for chiral derivatives of tin, and 'H and 13C spin coupling constants to ll'Sn and '19Sn are discussed. Spin lattice relaxation of I3C in these derivatives has been measured, and is used to indicate the effects of steric crowding on the ligands in terms of their freedom to undergo conformational rearrangements.

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“…The parameter thus has no direct relevance to the presence or absence of the tin atom but is effectively an upfield correction for the positional constraint associated with the neophyl group, for which there is other n.m.r. evidence (9).…”

Section: Introductionmentioning

confidence: 98%