Details

Autor(en) / Beteiligte

• Luz, Christian
• Glok, Eduard
• Horrer, Günther
• Radius, Udo

Titel

N-heterocyclic carbene and cyclic (alkyl)(amino)carbene complexes of molybdenum() and tungsten()

Ist Teil von

• Dalton transactions : an international journal of inorganic chemistry, 2022-12, Vol.51 (47), p.18337-18352

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The synthesis and characterization of N-heterocyclic carbene (NHC) and cyclic (alkyl)(amino)carbene (cAAC) complexes of molybdenum( iv ) and tungsten( iv ) chloride is reported. Reaction of two equivalents of the NHCs IMes (1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene), IDipp (1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) and IiPr Me (1,3-diisopropyl-4,5-dimethylimidazolin-2-ylidene) with [MCl 4 (SEt) 2 ] (M = Mo, W) in toluene afforded the bis-NHC complexes [MCl 4 (NHC) 2 ] (M = Mo: NHC = IMes 1 , NHC = IMes 2 ; M = W: NHC = IMes 3 , NHC = IDipp 4 , NHC = IiPr Me 5 ). Mono-carbene complexes [MCl 4 (NHC)(SEt 2 )] 6-9 (M = Mo: NHC = IMes 6 , NHC = IMes 7 ; M = W: NHC = IMes 8 , NHC = IDipp 9 ) are available via ligand dismutation of 1-4 with [MCl 4 (SEt) 2 ]. Complexes 1-9 were characterized by using elemental analysis, IR- and multinuclear NMR spectroscopy and X-ray diffraction for 1-8 . The reactivity of the mono-NHC complexes 6-9 towards the cyclic (alkyl)(amino)carbene cAAC Me as well as the two electron donor ligands trimethylphosphine, triphenylphosphine, pyridine (py) and N , N -dimethylpyridin-4-amine (DMAP) was studied, which led to the synthesis of the mixed substituted complexes [MCl 4 (NHC)(cAAC Me )] (M = Mo: NHC = IMes 10 , NHC = IDipp 11 ; M = W: NHC = IMes 12 , NHC = IDipp 13 ), [MCl 4 (NHC)(PR 3 )] (M = W: NHC = IMes, R = Me 14 , NHC = IMes, R = Ph 15 , NHC = IDipp, R = Me 16 , NHC = IDipp, R = Ph 17 ), [MCl 4 (NHC)(py)] (M = Mo: NHC = IMes 18 , NHC = IDipp 20 ; M = W: NHC = IMes 22 , NHC = IDipp 24 ) and [MCl 4 (NHC)(DMAP)] (M = Mo: NHC = IMes 19 , NHC = IDipp 21 ; M = W: NHC = IMes 23 , NHC = IDipp 25 ). The synthesis, characterization, and molecular structures of NHC and cAAC Me stabilized Mo( iv ) and W( iv ) complexes are presented.