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[eta(5)-C5H4P(Se)P h-2](2) (dpspf), reacted readily with [Ag(MeCN)(4)]ClO4 in CH2Cl2 to quanti tatively give the monomeric two-coordinated complex [Ag(dpspf)]ClO4. The so lution behavior of the complex has been probed by variable-concentration an d/or -temperature multinuclear NMR spectroscopy (H-1, C-13, P-31 and Se-77) , which revealed extreme lability. Single-crystal X-ray structural analysis shows that the complex (orthorhombic, Pna2(1), a = 26.34(1), b = 12.363(6) , c = 11.209(6) Angstrom, Z = 4) exists as mononuclear species in an almost linear two-coordination environment around the silver atom with an Se(1)-A g-Se(2) angle of 176.5(1)degrees. The Ag-Se bond distances (2.456(4) and 2. 449(3) Angstrom) and the Ag-Se-P angles (98.1(2) and 102.6(2)degrees) point towards a substantially sp(3) hybridization of the selenium donor atoms. ( C) 2000 Elsevier Science S.A. All rights reserved.