The reaction of triosmium and -ruthenium clusters with bifunctional ligands

Reactions of Os3(CO)12 with carboxylic acids in a microwave reactor; synthesis of Os2(benzoate)2(CO)6, a dinuclear osmium(I) compound with aromatic carboxylate ligands

“…Several recent publications have focused on microwave-promoted reactions of Os 3 (CO) 12 , including its conversion to Os 3 (m-H) 2 (CO) 10 , [Os 10 C(CO) 24 ] 2À , Os 3 (CO) 11 (NCMe), Os 3 (m-H)(m-OH)(CO) 10 , and Os 6 (CO) 18 [21e24]. We chose to use a microwave reactor to carry out reactions between Os 3 (CO) 12 and various carboxylic acids with the intent of improving the yield of known Os 2 (m-O 2 CR) 2 (CO) 6 compounds as well as synthesizing new complexes including one with bridging aromatic carboxylate ligands.…”

A Rapid and Label‐free SERS Detection Method for Biomarkers in Clinical Biofluids

“…The metal carbonyl which we have chosen as the SERS reporter is an osmium carbonyl cluster; it is oxygen‐ and moisture‐stable, and very robust insofar as organometallic compounds go . The mode of interaction with metallic nanomaterials has also been well‐characterized by spectroscopic techniques . Successful deposition of the osmium carbonyl cluster (Os 3 (CO) 10 (μ‐H))(μ‐SCH 2 CH 2 COOH)) onto BMFON was confirmed by the presence of signals in the 1800–2200 cm −1 region (Figure B); the vibrational bands at 1960, 2030 and 2109 cm −1 suggest that the osmium carbonyl cluster was covalently bonded onto the gold surface as an Os 3 (CO) 10 (μ‐Ag)(μ‐SCH 2 CH 2 COOH) species …”

Catalytic rate enhancement observed for alkyne hydrocarboxylation using ruthenium carbonyl-capped nanostructures

“…The synthesis of [Ru 2 (MPA) 4 (CO) 4 ] n oligomer was modified from the reaction of triruthenium clusters with bifunctional ligands previously reported by Leong and co-workers [20]. Briefly, toluene (15 ml) containing 3-mercaptopropionic acid (MPA, 10 À3 M) and triruthenium dodecacarbonyl (Ru 3 (CO) 12 , 2 Â 10 À4 M) was purged with nitrogen gas for 10 min.…”

“…MPA molecules are known to utilize only the thiol (SH) groups for reaction with Ru 3 (CO) 12 to form Ru carbonyl oligomers of formula [Ru 2 (MPA) 4 (CO) 4 ] n (Fig. 3a) [20,25,26]. Hence the oligomers still possess free carboxyl groups which can readily bind to Ag or Au surfaces during nanoparticle formation.…”

“…We chose 3-mercaptopropionic acid (MPA) as the ligand of choice because it is known that MPA preferentially reacts with Ru 3 (CO) 12 via its thiol (SH) group [20], thus rendering its carboxylate (COOH) group on the other end of the molecule free for binding to Ag surfaces. Hence MPA molecules serve as effective linkages between the ruthenium carbonyl oligomers and the nanoparticles.…”