Synthesis and X-ray Molecular Structure Analysis of Some Au-Co, Au-Mn, and Hg-Co Bonded Compounds

A new 19-metal-atom cluster [(Me2PhP)10Au12Ag7(NO3)9] with a nearly staggered–staggered M5 ring configuration

“…To this was added an ethanol solution (20 mL) of NaBH 4 (12 mg, 0.3 mmol) and the mixture was stirred at room temperature for 2 h. The dark red solution was subjected to filtration and the solvent was stripped under reduced pressure from the filtrate. Recrystallization of the residue from dichloromethane-ethanol-hexane (1 : 1 : 1) gave dark green needle crystals of 1 (110 mg, 36% 24 IR Absorptios. t max /cm −1 (Nujol) 1338 (vs), 843(w), 692(m) cm −1 for free NO 3 ; 1435(vs), 1271(vs), 1025(m), 999(w) cm −1 for monodentate and chelating NO 3 .…”

“…XPS spectra were obtained on an ULVAC-PHI ESCA-5700MC spectrometer with Mg-K a exciting radiation (1253.6 eV) as was described previously. 24 Finely ground powders of products and BN standard were pressed into a disk and the disk was mounted on a stub. The 4f 7/2 and 4f 5/2 binding energies of Au(I) and 4d 5/2 and 4d 3/2 binding energies of Ag(I) were calibrated vs. the B 1s or N 1s lines of a sample base.…”

σ-Coordination of metal–boryl bonds to gold(i)

“…The Mn-Au distances of 2.553(1) (2), 2.574(1) (3) and 2.562(1) (4) Å lie in the range of the rather rare complexes containing a Z 1 -(Mn-Au) single bond (2.545-2.572 Å). [37][38][39] All Au-B distances in the three structures (2.303(9) Å, 2; 2.301(4) Å, 3 and 2.225(3) Å, 4) lie in the range expected for Au-B dative bonds, thus indicating significant Au-B interactions. Despite this, the boron centres of all three compounds retain a trigonal planar coordination with respect to the Mn, Cl and C atoms as indicated by the corresponding angular sums of +Mn-B-Cl, +Cl-B-C and +C-B-Mn (SB a ) being 357.41 (2), 357.31 (3) and 357.31 (4).…”

Gold–Heterometal Interactions and Bonds

“…Most dinuclear Au/Co species whose structure has been reported so far [172,173,423,424] contain an unsupported Au-Co bond, for example (Ph 3 P) AuCo 437]. Supported Au-Co bonds might be considered for the tetranuclear species (m-dppm) 2 Au 2 Co 2 (CO) 6 298 [Au-Co 2.55(2)/2.45(2) Å], which contains a Co-AuÁ Á ÁAu-Co skeleton as part of a dicyclic system with a common Au-Au bond (Figure 4.40a) [425,426].…”

“…Gold-Manganese and Gold-Rhenium Compounds Few dinuclear compounds with Au-Mn[171][172][173][174] and Au-Re[175][176][177] bonds are known. Typical examples for unsupported Au-metal bonds are (m-dppf)176], with either an additional Au-B interaction or a bridging hydrido ligand, can be considered.…”