trans-Chelating ligating ability of 1,1′-bis(diphenylselenophosphoryl)ferrocene (dpspf) towards silver(I). Crystal structure of [Ag(dpspf)]ClO4

The ligand 1,1′-bis(diphenylselenophosphoryl)ferrocene, Fe[η5-C5H4P(Se)Ph2]2 (dpspf), reacted readily with [Ag(MeCN)4]ClO4 in CH2Cl2 to quantitatively give the monomeric two-coordinated complex [Ag(dpspf)]ClO4. The solution behavior of the complex has been probed by variable-concentration and/or -temperature multinuclear NMR spectroscopy (1H, 13C, 31P and 77Se), which revealed extreme lability. Single-crystal X-ray structural analysis shows that the complex (orthorhombic, Pna21, a=26.34(1), b=12.363(6), c=11.209(6) Å, Z=4) exists as mononuclear species in an almost linear two-coordination environment around the silver atom with an Se(1)AgSe(2) angle of 176.5(1)°. The AgSe bond distances (2.456(4) and 2.449(3) Å) and the AgSeP angles (98.1(2) and 102.6(2)°) point towards a substantially sp3 hybridization of the selenium donor atoms.