BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Molybdenum(II) Complexes with -Diimines: Catalytic Activity in Organic and Ionic Liquid Solvents

Participants in the publication
Marta S. Saraiva (Author)
Dep. Química e Bioquímica
CQB
Carla D. Nunes (Author)
CQB
CQE
Vítor Félix (Author)
UNIVERSIDADE DE AVEIRO
Ana P. C. Ribeiro (Author)
INSTITUTO SUPERIOR TÉCNICO
Carlos Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE
Maria José Calhorda (Author)
Dep. Química e Bioquímica
CQB
BioISI

Summary
\\\\nThe new [MoX(η3?C3H5)(CO)2(α?diimine)] complexes with: (i) X = Br or triflate and α?diimine = 1,10?phenanthroline (phen) and dipyridophenazine (dppz); and (ii) X = Br and α?diimine = phen and dppz, with several substituents, are synthesized and characterized. The structures of [MoBr(η3?C3H5)(CO)2(Cl?phen)] and [Mo(CF3SO3)(η3?C3H5)(CO)2(dppz)] are determined by using single?crystal X?ray diffraction. These and three complexes of 2,2′?bipyridyl (bpy), and its two derivatives with Me and tBu substituents, are tested in the homogeneous catalytic epoxidation of several olefins in dichloromethane, exhibiting, in general, a good selectivity towards the respective epoxide and relatively low TOFs. For the first time, the oxidation of cis?cyclooctene with some of these catalysts is also conducted in a variety of room?temperature ionic liquids (RTILs). In the presence of [MoBr(η3?C3H5)(CO)2(phen)], the conversions, in general, increase, compared with the reactions in organic solvents. Interestingly, different chemoselectivity is found when [C6mim][Ntf2] and [C2mim][FAP] are used with diol (24–26 %). On the other hand, [MoBr(η3?C3H5)(CO)2(L)] (L = Me?phen or dppz) exhibits much lower conversions in the RTILs tested than in common organic solvents.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
European Journal of Inorganic Chemistry

Publication Identifiers
ISSN - 1434-1948

Publisher
Wiley



Document Identifiers
URL - http://dx.doi.org/10.1002/ejic.201800700
DOI - https://doi.org/10.1002/ejic.201800700

Rankings
SCIMAGO Q2 (2018) - 0.736 - Inorganic Chemistry
Web Of Science Q2 (2018) - 2.578 - CHEMISTRY, INORGANIC & NUCLEAR - SCIE
SCOPUS Q2 (2017) - 0.828 - Inorganic Chemistry

Keywords
Catalysis Molybdenum ?-diimine epoxidation ionic liquids