@article { ISI:000236419800016,
	title = {MCM-41-supported platinum carbonyl cluster-derived catalysts for asymmetric and nonasymmetric hydrogenation reactions},
	journal = {Journal of Catalysis},
	volume = {239},
	number = {1},
	year = {2006},
	month = {APR},
	pages = {154-161},
	publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE},
	type = {Article},
	address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA},
	abstract = {<p>Anionic platinum carbonyl Cluster ([Pt-12(CO)(24)](2-)) was ion-paired with the 3-chloropropyltrimethoxysilyl-ammonium group chemically bound to the surface of MCM-41. The materials undergo quick decarbonylation and have been characterized before decarbonylation by IR and UV-vis spectroscopy and after decarbonylation by XPS and TEM. They have been used as catalysts for the hydrogenations of methyl pyruvate, acetophenone, nitrobenzene, benzonitrile, and ethylacetoacetate. The support and the quaternary ammonium groups have significant effects on surface platinum concentration, crystallite size, and observed activity. In the hydrogenation of the prochiral substrates methyl pyruvate or acetophenone, the cinchonidine-based catalyst gives significant enantioselectivity under optimum conditions. A kinetic model that includes an enantioselective product-formation step and a hydrogen pressure-dependent step for the deactivation of the enantioselective sites gives reasonable agreement between predicted and observed enantioselectivity. The model is also in accordance with the XPS and TEM data. (c) 2006 Elsevier Inc. All rights reserved.</p>},
	keywords = {asymmetric/non-asymmetric catalysis, Enantioselectivity, functionalized MCM-41, hydrogenation catalysts, platinum carbonyl cluster},
	issn = {0021-9517},
	doi = {10.1016/j.jcat.2006.01.032},
	author = {Basu, Susmit and Mapa, Maitri and Gopinath, Chinnakonda S. and Doble, Mukesh and Bhaduri, Sumit and Lahiri, Goutam Kumar}
}
@article { ISI:000257904900015,
	title = {MCM-41-supported ruthenium carbonyl cluster-derived catalysts for asymmetric hydrogenation reactions},
	journal = {Applied Catalysis A-General},
	volume = {344},
	number = {1-2},
	year = {2008},
	month = {JUL},
	pages = {124-130},
	publisher = {ELSEVIER SCIENCE BV},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>{The anionic ruthenium carbonyl cluster [Ru-4(mu-H)(3)(CO)(12)](-) has been ion-paired with (3-chloropropyl)-trimethoxysilyl-cinchonidium or sparteinium groups chemically bound to the surfaces of MCM-41 [(MCM-41-)(-O)(3)SiCH2CH2CH2NR3+Cl-</p>},
	keywords = {asymmetric catalysis, functionalized MCM-41, hydrogenation catalysts, nanocatalyst, ruthenium carbonyl cluster},
	issn = {0926-860X},
	doi = {10.1016/j.apcata.2008.04.009},
	author = {Indra, Arindam and Basu, Susmit and Kulkarni, Dhanashree G. and Gopinath, Chinnakonda S. and Bhaduri, Sumit and Lahiri, Goutam Kumar}
}
