Abstract New heteronuclear noble metal cluster complexes have been discovered and synthesized for the first time. These complexes are (pyridine)2 Pt[Ir6(CO)15], (pyridine)2 Pt[Ir2(CO)7], (pyridine)3 Pt[Ru3(CO)12], ((C6H5)3P)2 Pt[Ir(CO)3P (C6H5)3]2, ((C6H5)3P)2Rh(CO)[Ir(CO)4], and (pyridine)2 Pt[Rh(CO)2(P(C6H5)3)2]2. These new heteronuclear noble metal cluster complexes are useful as supported mixed noble metal catalyst precursors. These new cluster complexes, of known stoichiometry, are deposited on anhydrous refractory inorganic oxide or carbon supports and then reduced resulting in the formation of a supported heteronuclear noble metal catalyst having the same metals stoichiometry as the starting cluster complexes. In this way, precise control can be exercised over the ratio and distribution of multiple metal components in a mixed noble metal catalyst. The usage of preformed heteronuclear noble metal cluster complexes as supported mixed metal catalyst precursors maximizes surface alloy formation and also yields unique mixed-metal cluster structures on the support surface.
A heteronuclear noble metal cluster complex of the formula: (pyridine).sub.2 Pt[Ir.sub.6 (CO).sub.15 ] which exhibits the following characteristic infrared pattern (cm -1 ) in THF solution: 2044 m 2022 sh 2011 vs 1987 sh 1975 vs 1785 m 1733 m.
Claim 2
Dependent Claim
40 words
A heteronuclear noble metal cluster complex of the formula: (pyridine).sub.2 Pt[Ir.sub.6 (CO).sub.15 ] which exhibits the following characteristic infrared pattern (cm -1 ) in THF solution: 2044 m 2022 sh 2011 vs 1987 sh 1975 vs 1785 m 1733 m.
Claim 3
Dependent Claim
39 words
A heteronuclear noble metal carbonyl cluster complex of the formula: (pyridine).sub.2 Pt[IR.sub.2 (CO).sub.7 ] which exhibits the following characteristic infrared pattern (cm -1 ) in THF solution: 2035 sh 2009 sh 1983 vs 1938 sh 1785 sh 1732 m-s.
Claim 4
Dependent Claim
39 words
A heteronuclear noble metal carbonyl cluster complex of the formula: (pyridine).sub.2 Pt[IR.sub.2 (CO).sub.7 ] which exhibits the following characteristic infrared pattern (cm -1 ) in THF solution: 2035 sh 2009 sh 1983 vs 1938 sh 1785 sh 1732 m-s.
Claim 5
Dependent Claim
15 words
A heteronuclear noble metal carbonyl cluster complex of the formula: (pyridine).sub.2 Pt[Rh(CO).sub.2 (P(C.sub.6 H.sub.5).sub.3).sub.2 ].sub.2.
Claim 6
Dependent Claim
15 words
A heteronuclear noble metal carbonyl cluster complex of the formula: (pyridine).sub.2 Pt[Rh(CO).sub.2 (P(C.sub.6 H.sub.5).sub.3).sub.2 ].sub.2.
Claim 7
Dependent Claim
42 words
A heteronuclear noble metal carbonyl cluster complex of the formula: (pyridine).sub.3 Pt[Ru.sub.3 (CO).sub.12 ] which exhibits the following characteristic infrared pattern (cm -1 ) in THF solution: 2050 sh 1999 vs 1977 sh 1962 sh 1945 m 1804 vw, br 1763 w.
Claim 8
Dependent Claim
42 words
A heteronuclear noble metal carbonyl cluster complex of the formula: (pyridine).sub.3 Pt[Ru.sub.3 (CO).sub.12 ] which exhibits the following characteristic infrared pattern (cm -1 ) in THF solution: 2050 sh 1999 vs 1977 sh 1962 sh 1945 m 1804 vw, br 1763 w.