Charge-transfer salts with mononuclear and dinuclear ylide gold(I) complexes: X-ray structure of [Au(CH(2)PPh(3))(2)](TCNQ) (TCNQ=7,7',8,8'-tetracyanoquinodimethane)

The reaction of [Au-2(CH(2)PPh(2)CH(2))(2)] with 7,7',8,8'-tetracyanoquinodimethane (TCNQ) or 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) led to the charge-transfer complexes [Au-2(CH(2)PPh(2)CH(2))(2)](2)(TCNQ) (1) and [Au-2(CH(2)PPh(2)CH(2))(2) [(DDQ) (2). In a similar way [Au-2(NC5H4S)(2)] reacts with TCNQ forming [Au2NC5H4S)(2)][(TCNQ) (3). All these complexes show conductivities of about 10(-5) S cm(-1) in pressed pellet samples. The reaction of [Au(CH(2)PR(3))(2)]ClO4(PR(3) = PPh(3), PPh(2)Me or PPhMe(2)) with LiTCNQ led to cationic complexes [Au(CH(2)PR(3))(2)](TCNQ) which react further with TCNQ to give [Au(CH(2)PR(3))(2)](TCNQ)(2). The structure of [Au(CH(2)PPh(3))(2)](TCNQ) has been established by X-ray crystallography. The cation shows a linear coordination of gold. Two independent TCNQ molecules are related by a crystallographic inversion symmetry.