The mesomerically stabilised anion tris(diphenylphosphinoyl)methanide reacts with yttrium(also scandium, lutetium, and praseodymium ) chloride to from tris[tris(diphenylphosphinoyl)methanido]yttrium in which the ligand is bidentate and kinetically inert on an n.m.r. time-scale at room temperature and from whose 31P n.m.r. spectrum a 89Y–31P nuclear spin coupling constant can be determined.
S. O. Grim and S. A. Sangokoya, J. Chem. Soc., Chem. Commun., 1984, 1599 DOI: 10.1039/C39840001599
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