GOLD COMPLEXES WITH SELENIUM LIGANDS .4. PREPARATION, CRYSTAL-STRUCTURES AND REACTIONS OF PHOSPHINE(SELENOUREA)GOLD(I) COMPLEXES

(Triphenylphosphine)(selenourea)gold(I) chloride [Ph3PAuSeC(NH2)2]+ Cl- (1) and the corresponding dppm derivative dppm[AuSeC(NH2)2]2(2+) 2 Cl- (2) are prepared from SeC(NH2)2 and the appropriate chloro(phosphine)gold(I) complex. The reaction between 1 and aqueous Na2CO3 leads to the neutral complex mu-selenido{bis[(triphenylphosphine)gold(I)]} (Ph3PAu)2Se (3). An analogous reaction with 2 leads to a dark red oil, which has not yet been characterized. The reaction between 3, Ph3PAuCl, and AgSbF6 leads to the ionic complex [(Ph3PAu)3Se]+SbF6- (4) in good yield. X-ray structure analyses of 1, 2, and 3 confirm the expected linear geometry at the gold atom and reveal short intramolecular Au - Au contacts for 2 and 3. Short nonbonding distances between the nitrogen atoms of the amino groups and the chloride ions in the crystal structures of 1 and 2 probably indicate hydrogen bonds.