Molybdenum and tungsten complexes of the neutral tripod ligands HC(pz)3 and MeC(CH2PPh2)3

Molybdenum Complexes Bearing the Tris(1‐pyrazolyl)methanesulfonate Ligand: Synthesis, Characterization and Electrochemical Behaviour

“…They are shifted to higher frequencies than those of the starting Mo 0 tricarbonyl complex, thus reflecting the decrease in electron density at the central metal atom as a result of the oxidation. This pattern is consistent with either a 4:3 "piano stool" structure [38,41] or a 3:3:1 structure with axial CO [39] (Scheme 2a and b, respectively). Both these possibilities have already been reported for related complexes, such as [Mo(Tp)Br(CO) 3 ] [41] and [Mo(Tpm)Br-…”

“…The fluxionality of seven-coordinate molybdenum(II) and tungsten(II) complexes is well known. [38,[41][42][43] Slow diffusion of Et 2 O into a saturated solution of complex 3 in CH 3 CN afforded reddish-brown crystals suitable for X-ray diffraction study. The data revealed the tetraoxo 2+ bridging structure found in many compounds.…”

“…[ [41] which is consistent with the weaker electron-donor ability of Tpms in comparison with Tp (see above). [38] and analogous Tp compounds. [41,[52][53][54] By slow evaporation of a solution of 5 in chloroform, reddish-brown crystals were obtained.…”

“…[37] In addition, oxidation of [Mo(Tpm)(CO) 3 4 ]. [38] In contrast to the above-described Tpm Mo derivatives, the reactivity with Mo of the related anionic sulfonate-functionalized species [i.e., the tris(1-pyrazolyl)methanesulfonate (Tpms)], had not yet been investigated, to the best of our knowledge. This has encouraged us, within the above goals of the present study, to prepare the first Mo-Tpms compounds, to examine their properties and, when appropriate, to compare them with those of the neutral Tpm analogues.…”

The preparation of multimetallic complexes using sterically bulky N-centred tripodal dialkyl phosphino ligands

“…The tripodal phosphine 1,1,1-tris(diphenylphosphinomethyl)ethane (CH 3 (CH 2 PPh 2 ) 3 , triphos, 1) is one of the most widely studied triphosphine ligands and has been shown to form an extensive range of metal complexes [4][5][6][7][8][9][10][11][12] and a number of active catalytic species [13][14][15][16][17][18]. New triphos-type ligands continue to attract interest for the preparation of coordination complexes [19][20][21][22][23][24], however, their synthesis is not always trivial.…”