| Abstract
| - The reaction of the bis(iminophosphorano)methane, CH2(Cy2PNSMe3)2 (1), with methyllithium (even with excess of the latter) gave the monomeric methanide complex [Li{HC(Cy2PNSiMe3)2-κC,κN,κN‘}(OEt2)] (2) in a good yield. The reaction of H2C(Ph2PNSiMe3)2(2) with equimolar equivalents of NaH or KH in THF solvent yielded monomeric [M{HC(Ph2PNSiMe3)2-κN,κN‘}(THF)2] (M = Na, 4; K, 5) with evolution of hydrogen gas. The crystalstructures of each complex show the development of a unique coordination sphere aroundeach alkali metal. In the lithium complex, 3, the central carbon atom of the ligand is boundto the metal, but such interaction does not occur in the case of either the Na, 4, or the K, 5,complexes. However in the potassium complex, one of the phenyl rings of the ligand isπ-coordinated to the metal.
- The monomeric alkali metal bis(iminophosphorano)methanide complexes M{(H)C(R2PNSiMe3)2} (R = Cy, M = Li, 3; R = Ph, M = Na, 4; R = Ph, M = K, 5) each have a unique coordination geometry reflecting the character of the metal as it relates to these ligands. In the lithium complex 3, the central carbon atom of the ligand is bound to the metal, but such interaction is not developed in the case of the Na, 4, and K, 5, complexes. However in the potassium complex, 5, one of the phenyl rings of the ligand is π-coordinated to the metal.
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