Successive Protonation and Methylation of Bridging Imido and Nitrido Ligands at Titanium Complexes
Authors
Barriopedro Torres, Paula; Caballo González, Jorge; Mena Montoro, Miguel; Pérez Redondo, Adrián; Yélamos Sánchez, CarlosIdentifiers
Permanent link (URI): http://hdl.handle.net/10017/43509DOI: 10.1021/acs.inorgchem.0c00550
ISSN: 0020-1669
Date
2020-06-01Embargo end date
2021-06-02Funders
Ministerio de Ciencia, Innovación y Universidades de España, Ministerio de Educación y Ciencia de España, Universidad de Alcalá
Bibliographic citation
Inorganic Chemistry, 2020, v. 59, n. 11, p. 7631-7643
Project
PGC2018-094007-B-I00, CCG2018/EXP-008
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
© American Chemical Society, 2020
Access rights
info:eu-repo/semantics/openAccess
Abstract
The reactions of nitrido complexes [{Ti(eta5-C5Me5)(mu-NH)}3(mu3-N)] (1) and [{Ti(eta5-C5Me5)}4(mu3-N)4] (2) with electrophilic reagents ROTf (R = H, Me; OTf = OSO2CF3) in different molar ratios have allowed the structural characterization of a series of titanium intermediates en route to the formation of the ammonium salts [NR4]OTf and [NR4][Ti(eta5-C5Me5)(OTf)4]. The treatment of the trinuclear imido-nitrido complex 1 with 5.5 equiv of triflic acid in toluene at room temperature led to the dinuclear complex [Ti2(eta5-C5Me5)2(mu-N)(NH3)(mu-O2SOCF3)2(OTf)] (3) and [NH4]OTf. Compound 3, along with the ammonium salts [NMe4]OTf and [NMe4][Ti(eta5-C5Me5)(OTf)4] (5), was also obtained in the reaction of 1 with 8 equiv of methyl triflate in toluene at 100 °C. The trinuclear complex [Ti3(eta5-C5Me5)3(mu-N)(mu-NH)2(mu-O2SOCF3)(OTf)] (4), an intermediate in the formation of 3, was isolated in the treatment of 1 with 4 equiv of MeOTf, although compound 4 was prepared in better yield by treatment of 1 with Me3SiOTf (2 equiv). Addition of a large excess of MeOTf or HOTf reagents to solutions of 3 resulted in the clean formation of ammonium salts [NR4][Ti(eta5-C5Me5)(OTf)4] (R = Me (5), H (6)). Treatment of the tetranuclear nitrido complex [{Ti(eta5-C5Me5)}4(mu3-N)4] (2) with 1 equiv of ROTf in toluene afforded the precipitation of the ionic compounds [{Ti(eta5-C5Me5)}4(mu3-N)3(mu3-NR)][OTf] (R = H (8), Me (9)), while a large excess of HOTf led to the formation of [{Ti(eta5-C5Me5)}4(mu3-N)3(mu3-NH)][Ti(eta5-C5Me5)(OTf)4(NH3)] (10) by rupture of a fraction of tetranuclear molecules. Complex 2 reacted with 1 equiv of [M(eta5-C5H5)(CO)3H] (M = Mo, Cr) via hydrogenation of one nitrido ligand to give the molecular derivative [{Ti(eta5-C5Me5)}4(mu3-N)3(mu3-NH)] (11) and [{M(eta5-C5H5)(CO)3}2], while a second 1 equiv of [M(eta5-C5H5)(CO)3H] produced the ionic compounds....
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