CLUSTER CHEMISTRY .87. SOME HOMO-NUCLEAR AND HETERO-NUCLEAR COMPLEXES DERIVED FROM C2(PPH2)2 - CRYSTAL-STRUCTURES OF RE3(MU-H)3(MU-DPPA)(CO)10 (DPPA=C2(PPH2)2), RE3(MU-H)3(CO)11(PPH2[MU-C2RU2(MU-PPH2)(CO)6]) AND OS3RU2(MU-5-C2PPH2)(MU-PPH2)(CO)13

Reaction of two equivalents of Re3(mu-H)3(CO)11(NCMe) with dppa produces the complex {Re3(mu-H)3(CO)11}2(mu-dppa) (2). When an excess of dppa is used, mono-substituted Re3(mu-H)3(CO)11(dppa) (3) and Re3(mu-H)3(mu-dppa)(CO)10 (4) were produced. When 3 is treated with Ru3(CO)12, the complex (Re3(mu-H)3(CO)11}(mu-dppa)(Ru3(CO)11) (5) is produced in high yield. When 5 is heated, the complex Re3(mu-H)3(CO)11(PPh2[mu-C2RU2(mu-PPh2)(CO)6]} (6) is produced. Using the same methodology, {Os3(CO)11}(mu-dppa){Ru3(CO)11} (8} and {Os3(CO)11}(mu-dppa){Re3(mu-H)3(CO)11) (11) were prepared. When 8 is heated, the heteronuclear M5 cluster Os3Ru2(mu5-C2PPh2)(mu-PPh2)(CO)13 (10) is produced. Complexes 4, 6 and 10 were identified by single crystal X-ray studies.