ISSN:
1572-8854
Schlagwort(e):
X-ray crystallography
;
1H NMR
;
organotin
;
steric effects
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Geologie und Paläontologie
,
Physik
Notizen:
Abstract The crystal and molecular structure of Ph3SnCH2CH2SC6H4Me-p has been determined by X-ray crystallography. In each of the two independent molecules in the asymmetric unit the tin atom has an irregular tetrahedral geometry, with C−Sn−C valency angles ranging from 104.1(5) to 114.7(5)° in molecule (1) and from 104.6 to 112.7(6)° in molecule (2). The bond lengths, Calkyl−Sn are 2.18(1) and 2.17(2)Å (in molecules (1) and (2), respectively) while the Caryl−Sn bond lengths range from 2.11(1) to 2.13(1)Å in molecule (1) and from 2.09(1) to 2.14(1)Å in molecule (2). The Sn−C−C−S torsion angle, 172(1)° is the same for both molecules. NMR spectral data are presented; the1H NMR spectrum in solution of the central-CH2−CH2-unit suggests that each of the protons on each of the CH2 groups is magnetically distinct and that rotations about the C−C bond are slow on the NMR time scale. Comparisons with similar molecules are made and conformations discussed in terms of steric effects.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01665705
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