Abstract
The reaction of the metal–metal bonded complex Re2(CO)10 with Cp2Zr(PPh2)2 results in formation of the diphosphido bridged heterobimetallic species, Cp2Zr(μ-PPh2)2ReH(CO)3, 1. Complex 1 crystallizes in the space group P21/c with a = 17.393(3) Å, b = 14.348(7) Å, c = 13.036(3) Å, β = 92.35(2)°, Z = 4, and V = 3250(2) Å3. The crystallographic study confirmed that complex 1 contains two phosphido bridges between the Zr and Re centres. The Zr—P bond distances are 2.629(3) and 2.615(3) Å, while the Re—P bonds are 2.498(3) and 2.474(3) Å. The Zr—Re separation is 3.274(1) Å. The details of the geometry of the ZrP2Re core are discussed in relation to that of other diphosphido bridged early/late heterobimetallics. The possibility of dative bonding between the electron-rich, late metal and the electron-deficient early metal centre is discussed. The data indicate that if such dative bond is present in the d0–d6 complex 1, it is very weak. Keywords: rhenium, zirconium, heterobimetallic, crystal structure.
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