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13C Nuclear magnetic resonance studies of the oriented molecules in the liquid crystal solvent. Anisotropy of 13C shielding constants in 13CH3I and 13CH3CN

✍ Scribed by I. Morishima; A. Mizuno; T. Yonezawa

Publisher: Elsevier Science
Year: 1970
Tongue: English
Weight: 262 KB
Volume: 7
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(70)87026-9

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✦ Synopsis

Rcccivcd 14 Scptcmbcr 1970 Anisotropies 01 the 13C shielding constant @UC) for CIinI and Cll+!X arc obtained from 'k SMi1 studies of these molcculcs in the ncmatic solvents. The results arc compnrcd with the Lhcorctkal vnlues obtained by the molccuklr orhitnl cnlculxtions using thz current theory. Tk :~giccmenL is f:lirl> satisfactory for CI!,CB. but not for CI131. The obscrvctl ixrgc ncgativc value o: 4oC for CII:II (the thcorcticnlp_rcdictxm is positive) is discussed in terms of the possible swrccs of the heavy atom cf-Sect on the 13C chemical shift.

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