Preparation and properties of molybdenum and tungsten dinitrogen complexes. 39. Alkenyldiazenido complexes of molybdenum and tungsten derived from dinitrogen complexes: their synthesis, characterization, and novel reactivities

Organic–inorganic hybrid matrix doped with alkenyldiazenido complexes of molybdenum

“…31 P-{ 1 H} NMR spectroscopy shows a single resonance which demonstrates that the complex retains the square-planar array of P atoms about the molybdenum [20]. 1 H NMR spectrum revealed the presence of all the H of the diazoalkene ligand in similar positions for other analogous complexes of literature [21].…”

Molybdenum Complexes Bearing (Bi)thienyl‐ or Arylthienyl‐Substituted π‐Conjugated Spacers: Synthesis, Electrochemical, Spectroscopic and Nonlinear Optical Properties

“…[23,34,37] The shifts observed on ν(C=N) stretching has been attributed to π-backdonation, due to π bonding between the d orbitals of the metal and the π* orbital of the heterocyclic imide group, which leads to a variation in C=N bond order. [38] Accordingly, the highest shift of 14 cm -1 was found for 5b compared to 5a which corresponds to the complex having the arylthienyl moiety functionalized with the methoxy group.…”

“…[36,37] This complex is susceptible to electrophilic attack at the terminal nitrogen atom therefore they can serve as key intermediate in the preparation of organo-nitrogen complexes by subsequent reactions with organic carbonyl compounds. [23,38] Thus, the condensation reaction of trans-[MF(NNH 2 )(dppe) 2 ][BF 4 ] with a slight excess of the formyl-(bi)thiophenes 1, and formyl-arylthiophenes 2-3, gave the molybdenum complexes 4a-b, 5a-b and 6, respectively (Scheme 1).…”

Synthesis and Electrochemical and Spectroscopic Properties of Molybdenum Complexes Bearing 5‐Alkoxythiophene or ‐bithiophene Groups

“…[11,12] In this paper we wish to report the synthesis and the electrochemical, spectroscopic and solvatochromic properties of the new electron-donor-π-acceptor systems trans-[MoF{NN=CH(thienyl-5Ј-alkoxy)}(dppe) 2 ][BF 4 ] 6 and 8 (alkoxy = OMe and OEt, respectively) and trans-[MoF{NN=CH(bithienyl-5Ј-alkoxy)}(dppe) 2 ][BF 4 ] 7, 9 and 10 (alkoxy = OMe, OEt and OiPr, respectively). As far as we know, the synthesis and the characterisation of molybdenum complexes bearing 2-alkoxythienyl groups and 2-alkoxybithienyl groups has not been reported previously.…”