Spectroscopic studies of inorganic fluoro-complexes. Part II. 19F nuclear magnetic resonance studies of tin(IV) fluoro-complexes
作者:P. A. W. Dean、D. F. Evans
DOI:10.1039/j19680001154
日期:——
Approximately 100 anions of the general type SnF6–nXn2– have been characterised in solution by 19F n.m.r. spectroscopy, where X is one of a wide range of unidentate ligands or half a bidentate ligand. Complexes containing two different groups X, and mononegative anions containing a neutral ligand, have also been studied. cis/trans ratios have been obtained for many of the geometrical isomers. 19F chemical
通过19 F nmr光谱在溶液中表征了大约100个一般SnF 6– n X n 2–型阴离子,其中X是范围广泛的不明配体之一或二齿配体的一半。还研究了包含两个不同基团X的配合物和包含中性配体的单负阴离子。已获得许多几何异构体的顺/反比。报告了19 F化学位移以及锡-氟和氟-氟偶联常数。在19个˚F化学位移δ(相对于的SnF 6 2-在这些络合物氟原子的离子)被给予,以一个很好的近似,通过δ= PC + qT的,其中Ç和Ť是配体X的特征常数,而且p和q为取代基的数量顺和反式的分别为氟原子。建议配体在顺式位置的作用主要是由于分子内范德华相互作用。已获得氯离子,溴离子和氢氧根离子以及水置换出SnF 6 2–中的氟离子的近似平衡常数。
Spectroscopic studies of inorganic fluoro-complexes. Part I. The 19F nuclear magnetic resonance and vibrational spectra of hexafluorometallates of Groups IVA and IVB
作者:P. A. W. Dean、D. F. Evans
DOI:10.1039/j19670000698
日期:——
The infrared, Raman, and 19F n.m.r. spectra of the hexafluoro-anions of the Group IVA and IVB elements have been measured. We conclude that the predominant species present in aqueous solutions of the ammonium salts are the octahedral AF62– ions (except where A = Pb, when no definite conclusions could be drawn). In solution, the HfF72– ion dissociates into HfF62– and F–. Fluorine exchange is much more