The rhenacarborane salt Cs[Re(CO)(3)(eta (5)-7,8-C2B9H11)] (1) has been used to synthesize the tetranuclear metal complex [{ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3)}(2){mu -Ph2P(CH)(2))(2)PPh2}] (3) where two [ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3)] fragments have been shown by X-ray crystallography to be bridged by a single 1,2-bis-(diphenylphosphino)ethane ligand. Reaction of 1 with Ag[BF4] in the presence of the ligands bis- or tris(pyrazol-l-yl)methane yields the complexes [ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3){kappa (2)-CH2(C3H3N2-1)(2)}] (4) or [{ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3)}(2){mu-kappa (1), kappa (2)-CH(C3H3N2-1)(3)}] (5), respectively. From X-ray studies, the former comprises a Re-Ag bond bridged by the carborane cage and with the bis(pyrazol-l-yl)methane coordinating the silver(I) center in an asymmetric K? mode. Complex 5 was unexpectedly found to contain a tris(pyrazol-1-yl)methane bridging two [ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3)] fragments in a kappa (1),kappa (2) manner. Treatment of 1 with Ag[BF4] in the presence of 2,2 ' -dipyridyl and 2,2 ': 6 ' ,2 " -terpyridyl yields [ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3){kappa (2)-(C5H4N-2)(2)}] (6) and [ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3){kappa (3)-C5H3N(C5H4N-2)(2)-2}] (7). The X-ray structure determination of 7 revealed an unusual pentacoordinated silver(I) center, asymmetrically ligated by a kappa (3)-2,2 ' :6 '2 " -terpyridyl molecule. The same synthetic procedure using N,N,N ' ,N ' -tetramethylethylenediamine gave a tetranuclear metal complex [(ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3)}(2){mu -Me2N(CH2)(2)NMe2}(2)] (8) which is believed, in the solid state, to be bridged between the silver atoms by two of the diamine molecules. The salt 1 with Ag[BF4] in the absence of any added ligand gave the tetrameric cluster [ReAg{mu -5,6,10-(H)(3)-eta (5)-7,8-C2B9H8](CO)(3)](4) (9) where, in the solid state, four [ReAg(mu -10-H-eta (5)-7,8-C2B9H10)(CO)(3)] units are held together by long interunit B-H --> Ag bonds.