Abstract
A terminal Mo phosphide was prepared through the group transfer of both P and Cl atoms from chloro-substituted dibenzo-7λ3 -phosphanorbornadiene. This compound represents the first structurally characterized terminal transition-metal phosphide with valence d electrons. In the tetragonal ligand field, these electrons populate an orbital of dxy parentage, an electronic configuration that accommodates both metal d electrons and a formal M≡P triple bond. Single-electron oxidation affords a transient open-shell terminal phosphide cation with significant spin density on P, as corroborated by continuous wave (CW) and pulse electron paramagnetic resonance (EPR) characterization. Facile P-P bond formation occurs from this species through intermolecular phosphide coupling.
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