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Carbon-13 NMR studies of some paramagnetic transition-metal acetylacetonates some linewidth considerations

✍ Scribed by David M. Doddrell; Anthony K. Gregson

Publisher: Elsevier Science
Year: 1974
Tongue: English
Weight: 462 KB
Volume: 29
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(74)85080-3

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✦ Synopsis

CarborSi3 isotropic shifts and linewidths have been measurej far a series'of paramagktic trarisition-metal ,acctyla&tonates.

Tne resclts.hsve been cornpared with the corresponding NMR parameters of the contiguous prctons The relzktion pathw;ly of the % spins is c&rolled hi hypertine interactions with the unpaired electron s$ns and, in Mses where the proton lkewidth is also domtiated by.the hyperfine mechakn, good agreement is obtained between the experimental '.3_C/1H linewidth ratio and tha-: calculated on the basis of the &tact shifts Pseudocontact interactions czn be important In deterkiting thk, total i&tropic shift for both the 13C and 'H nuclei and con+ary to previous studies. it is suggested that such effects are also important for V(III) and hfn(II1) acetyl-

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