NEW HYDRIDE-CONTAINING MIXED-METAL GOLD PHOSPHINE CLUSTERS - CRYSTAL-STRUCTURES OF [PT(H)(CUCL)(AUPPH(3))(8)](NO3) AND [PT(H)(CUCL)(2)(AUPPH(3))(8)](NO3)
Tgmm. Kappen et al., NEW HYDRIDE-CONTAINING MIXED-METAL GOLD PHOSPHINE CLUSTERS - CRYSTAL-STRUCTURES OF [PT(H)(CUCL)(AUPPH(3))(8)](NO3) AND [PT(H)(CUCL)(2)(AUPPH(3))(8)](NO3), Inorganic chemistry, 34(8), 1995, pp. 2133-2142
Reactions of [Pt(AuPPh(3))(8)](NO3)(2) with M(I) species (M = Cu, Au)
under H-2-atmosphere yield several new hydride-containing mixed-metal-
gold phosphine cluster compounds. Two new hydride-containing PtAuCu cl
usters are obtained in this way; [Pt(H)(CuCl)(AuPPh(3))(8)](NO3) (1) a
nd [Pt(H)(CuCl)(2)(AuPPh(3))(8)](NO3) (2). Considerations on the solve
nt dependency show that the Bronsted acidity of the solvent used is cr
ucial in controlling the formation of 1 or 2. Clusters 1 and 2 were ch
aracterized by elemental analyses, ICP analyses, and IR and NMR (P-31
and Pt-195) Spectroscopy; their crystal and molecular structures have
been determined by single-crystal X-ray analyses. Compound crystallize
s in the monoclinic space group P2(1), with Z = 2, a = 15.284(8) Angst
rom, b = 26.004(2) Angstrom, c = 16.558(2) Angstrom, beta = 95.27(5)de
grees, and V = 6636 Angstrom(3); MO K alpha radiation was used. The re
siduals are R = 0.083 and wR(2) = 0.18 for 10 495 observed reflections
and 372 variables. 2 crystallizes in the triclinic space group P (1)
over bar, with Z = 2, a 15.349(4) Angstrom, b = 16.949(2) Angstrom, c
= 29.037(7) Angstrom, alpha = 78.95(1)0, beta = 74.87(2)degrees, gamma
= 84.74(2)degrees, and gamma = 7150 Angstrom 3; MO K alpha radiation
was used. The residuals are R = 0.085 and wR(2) = 0.22 for 15308 obser
ved reflections and 773 variables. Both clusters have a central platin
um atom surrounded by eight gold atoms and one (for 1) or two (for 2)
copper atoms; the gold atoms are attached to triphenylphosphine ligand
s, whereas the copper atoms are attached to chloride ligands. The crys
tal structures of 1 and 2 show that the copper atoms in these clusters
are located ''trans'' to the hydride ligand. [Pt(H)(PPh(3))(CuCl)(AuP
Ph(3))(6)](+) (5) is obtained from the reaction of the cluster [Pt(H)(
PPh(3))(AuPPh(3))(7)](NO3)2 with [PPh(3)CuCl](4). 5 was characterized
by IR, H-1 NMR, 319 NMR and Pt-195 NMR spectroscopy and by FAB-MS. In
addition to these PtAuCu clusters this paper also reports several new
PtHAu9 cluster compounds: [Pt(H)(AuPy)(AuPPh(3))(8)](NO3)(2) (3) (in w
hich Py = C5H4N), [Pt(H)(AuCl)(AuPPh(3))(8)](NO3) (4a), [Pt(H)(AuBr)(A
uPPh(3))(8)](Br) (4b), and [Pt(H)(AuSCN)(AuPPh(3))(8)](SCN) (4c). The
pyridine ligand of 3 can be substituted easily by Cl-, Br- or SCN- to
give 4a, 4b, or 4c, respectively. The thiocyanate ligand of 4c is show
n to be sulfur-coordinated to a gold atom.