Mössbauer, multinuclear magnetic resonance and mass spectrometric studies of organotin carboxylates of m-methyltrans-cinnamic acid

Redistribution reactions of diorganotin dicarboxylates and diorganotin dihalides: A convenient method for the preparation of halo-diorganotin carboxylates

“…The cumulative effect of these two highly electronegative groups on tin increases its Lewis acidity, which facilitates chelation through the carbonyl oxygen and results in a change in the geometry from tetrahedral to trigonal bipyramidal. Thus, an increase in the [2,3]. This is observed in the derivatives where R‫ס‬Me or Et (Tables 1 and 3), in agreement with the trigonal bipyramidal geometry due to the bidentate chelate carboxylate group.…”

“…119/117 Sn-13 C]| spin-spin coupling for R 3 SnL derivatives is usually less than 400 Hz and about 650 Hz for alkyl and aryl R groups, respectively [2,3]. In the present series, these values are in the range of 500-576 Hz for alkyl groups, while, for aryl groups, these coupling constants could not be observed.…”

“…In the present series, these values are in the range of 500-576 Hz for alkyl groups, while, for aryl groups, these coupling constants could not be observed. It has been re- (Tables 2 and 5), in comparison with their triorganotin analogues [2,3], also proves the increase in the coordination number of the tin atom [11,12]. However, the 119 Sn NMR resonance signals of these compounds are rather broad as compared to those of triorganotin carboxylates, in agreement with the dynamic process involving the carboxylate oxygens. ]…”

“…There is an increase in IS values (1.45-1.55 mm s ‫1מ‬ ) of these compounds as compared to those of R 3 SnL derivatives of these ligands [1,2]. This shows that the extent of s electron participation is considerably reduced.…”

“…Previously, we have synthesized and characterized organotin carboxylates of the general formulas R 3 SnL, R 2 SnL 2 , and [(R 2 SnL) 2 O] 2 using either an organotin chloride or an organotin oxide as one of the starting materials [2][3][4][5]. In this article, we report the *Author to whom correspondence should be addressed.…”