Dimolybdenum oxo-imido complexes: crystal structures of [(MeC5H4)2Mo2O2(μ-O)(μ-NPh)] and [(MeC5H4)MoO(μ-NPh)]2

Preparation and characterisation of dimolybdenum complexes containing fluorophenylimide ligands

“…20 The IR spectra of 1-5 show absorptions characteristic of (arylimido) dimolybdenum complexes. [14][15][16][17][18][19][20] In the cyclopentadienyl region of the 1 H NMR spectra (250 MHz) of complexes 1 and 2 a pair of virtual triplets of equal intensity are observed, and the 19 F NMR spectrum of each complex shows a singlet, confirming that 1 and 2 are single isomers with equivalent by the terminal ligands. The 19 F NMR spectrum comprises a singlet at room temperature, indicating rapid rotation within the CF 3 group.…”

“…6-8 Furthermore, additional stabilisation of metal centres by long-range metal-fluorine interactions has been established crystallographically in a number of complexes. [13][14][15][16][17][18][19] which exists in one of two geometries depending upon the nature of the bridging Y, YЈ groups, is ideal to study the electronic and steric effects of fluorine substitution in arylimide ligands. Where X, XЈ = Y, YЈ = O a puckered Mo 2 -(µ-O) 2 core with a cis arrangement of the C 5 H 4 R rings is adopted.…”

“…13 In contrast, replacement of one or both of the bridging oxide ligands by an arylimido group results in a planar metallacyclic Mo 2 (µ-Y)(µ-YЈ) core and a trans arrangement of the cyclopentadienyl rings. [14][15][16][17] This has been attributed both to the greater steric bulk and the stronger π-donor ability of the imide ligand.…”

High oxidation state organomolybdenum and organotungsten chemistry in protic environments

“…Exchange processes at the terminal Mo = NAr positions for other NAr (from Ar NCO) have been reported, whereas the bridging positions are inert [159]. Related mixed oxido-imido derivatives of type [Cp 2 Mo 2 O 2 (-O)(-NAr)], containing only one bridging imido ligand, have been obtained by another strategy, Scheme 17. namely oxidation of triply bonded [Cp 2 Mo 2 (CO) 4 ] with ArNO 2 [160,161].…”

Transformation of C2 units on a bimetallic tetranuclear cluster.

“…The geometries about C(1) and C(2) are outlined in Table 3 with both slightly distorted away from ideal sp 2 geometry, presumably due in some degree by coordination to the two bimetallic fragments. Although the Ru(1)-Ru (2) [41][42][43][44]. The unsymmetrical coordination of the bridging oxo group to the Mo(4)-Ru (3) (2.056(8), 2.049(8), 2.058(7) Å ) but is significantly shorter than those found for [Mo 2 Ru 3 (l 3 -O)(l 3 -CPh)(l-C 3 Ph 3 -(CO) 8 (g-C 5 H 5 ) 2 ] (2.098(6), 2.115(7), 2.001(7) Å ) [46].…”