Inorganic Chemistry, Vol.44, No.9, 2995-2997, 2005
An unprecedented coordination mode of the tris(pyrazolyl)methane donor set in {[Ph-2(O)POCH2C(PZ)(3)Ag](2)(THF)(2)}(BF4)(2): k(2)-k(1) bimetallic, N-sigma/N-pi chelating
The structure of the compound {[Ph-2(O)POCH2C(pz)(3)Ag](2)(THF)(2)}(BF4)(2) (pz = pyrazolyl ring) revealed a new coordination mode for the tris(pyrazolyl)methane donor set: two pyrazolyl rings bridging the same two silvers atoms using normal sigma-type orbitals on the nitrogen donor atoms while the third pyrazolyl ring coordinates side-on to one of the silver atoms with a nitrogen-based pi-type orbital. The dimeric arrangement is also supported by a weak silver-silver interaction. This bonding description is supported by Fenske-Hall molecular orbital calculations.