Influence of gold nanoparticles applied to catalytic hydrogenation of acetophenone with cationic complexes containing ruthenium.
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2016
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Abstract
Herein the catalytic activity of cationic ruthenium(II) complexes [Ru]+ is described in the presence of gold
nanoparticles (AuNPsn ) in the transfer hydrogenation of acetophenone, to produce phenylethanol. The
catalytic activity of the complexes, with a general formula cis-[RuCl(CH3OH)(P–P)(N–N)]+ or cis-
[RuCl(CH3OH)(P)2(N–N)]+ {where: P ¼ triphenylphosphine (PPh3); P–P ¼ 1,1-bis(diphenylphosphino)
methane (dppm); 1,2-bis(diphenylphosphino)ethane (dppe); 1,3-bis(diphenylphosphino)propane (dppp),
1,4-bis(diphenylphosphino)butane (dppb); N–N ¼ 2,20-bipyridine; 4,40-dimethyl-2,20-bipyridine} was
investigated in the presence of AuNPsn . The interaction between [Ru]+ and AuNPsn citrate capped is
an electrostatic interaction, by a self-assembly processes, to produce a supramolecular species, labeled
as [Ru]+/AuNPsn . This non-covalent interaction has no effect over the chemical and physical chemical
parameters of the complexes, which provides a good point of comparison in the presence and absence
of AuNPsn . The AuNPsn alone have no catalytic activity in the transfer hydrogenation of acetophenone
within 24 h of reaction. However, the AuNPsn have improved the catalytic activity of the complexes
that have biphosphines with tensioned or large bite angle, while for the complexes that have
biphosphines with a strong chelate effect a decrease in the catalytic activity was observed. The evidence
is supported by experimental values of the yields of the hydrogenated product and DFT calculations of
the “RuP–P” intermediates. Suitable crystals of cis-[RuCl2(dppe)(bipy)], cis-[RuCl2(dppp)(bipy)] and cis-
[RuCl(CH3OH)(dppb)(bipy)](PF6) were obtained and the X-ray structures are presented here.
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SOUZA, L. C. M. et al. Influence of gold nanoparticles applied to catalytic hydrogenation of acetophenone with cationic complexes containing ruthenium. RSC Advances: an international journal to further the chemical sciences, v. 6, p. 53130-53139, 2016. Disponível em: <https://pubs.rsc.org/en/Content/ArticleLanding/RA/2016/C6RA05616D#!divAbstract>. Acesso em: 05 ago. 2017.