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Molybdocene

B = molybdocene(IV) dithiol (70b). The solitaire porphyrazines exhibited rich redox chemistry, and could be oxidized with ferrocenium hexafluorophosphate to yield the paramagnetic Mo(V) species H2[pz(A3B)], A = di -ferf-butyl phenyl, B = molybdocene(V) dithiol (72a) and H2[pz(A3B)], A = dipropyl, B = molybdocene(V) dithiol (72b), which were studied by EPR (Scheme 13). Additionally, 70a was centrally metalated with Cu(II), to form Cun[pz(A3B)], A = di-ferf-butyl phenyl, B = molybdocene(IV) dithiol (71), which was then oxidized to Cun[pz(A3B)], A = di-terf-butyl phenyl, B = molybdocene(V) dithiol (73) and its magnetic properties investigated. [Pg.515]

Scheme 13. Preparation of solitaire molybdocene porphyrazines. [Adapted from (6).]... Scheme 13. Preparation of solitaire molybdocene porphyrazines. [Adapted from (6).]...
Optical Spectra. The optical spectra of 69a and 69b, 70a and 70b, 72a, 71, and 73 are given in Table XIX. Compounds 69a and 69b exhibit a Soret band between 340 and 375 nm and a split Q band, due to reduced symmetry of the solitaire, between 590 and 680 nm. The Q band collapses when the pz is peripherally metalated with molybdocene (70a and 70b) due to the extension of the pz n system into the five-membered chelate ring mediated by the bridging dithiolene. [Pg.516]

Electrochemistry-EPR. The redox potentials of the porphyrazines, 69a, 69b, 70a, and 70b were measured using cyclic voltammetry (Table XX). The redox potentials of the molybdocene appended porphyrazines 70a and 70b showed marked changes from that observed for the parent ligands 69a or 69b suggesting that the peripheral metalation by molybdocene profoundly alters the physiochemical properties of the macrocycle by more than just the sum of the two parts (6). [Pg.517]

The crystal structure of [(7i-Cp)2Mo(Br)SnBr3] has been determined and the Mo—Sn bond length found to be 269.1(4) pm. The reduction of [(7t-Cp)2-M0CI2] by Na-Hg in THF appears to give rise to molybdocene which, although... [Pg.143]

Coordinated olefins are also readily displaced by thioketones, e.g., stil-bene, in the molybdocene complex 14 by thiobenzophenone to form the complex 15 [Eq. (6)].138 Similarly, thiobenzophenone is substituted for ethene in [Rh(C2H4)(PMe3)(7/5-C5H5)] to yield [Rh(PMe3)(V-S = CPh2) ( -C5H5)]. m... [Pg.146]

Molybdocene C.Mo-Bis-[pentafluo-rophenylj-hvdrido- XIII/7, 471 ( R,MoCI2 + Li - Ar)... [Pg.729]

Molybdenum trioxide, intercalation into, 12, 823 Molybdocenes, as anticancer agents, 1, 892 MOMNs, see Metal-organometallic coordination networks Monisocyanides, with silver(I) complexes, 2, 223 Monitoring methods, kinetic studies, 1, 513 Mono(acetylacetonate) complexes, with Ru and Os halfsandwich rf-arenes, 6, 523 tj2-Monoalkene monodentate ligands, with platinum divalent derivatives, 8, 617 tetravalent derivatives, 8, 625 theoretical studies, 8, 625 zerovalent derivatives, 8, 612... [Pg.147]

The synthesis of molybdocene compounds containing a Mo-Si bond commonly proceeds via the oxidative addition of Si-H bonds to the 16 VE molybdocene fragment (vide infra). We present a new and very convenient synthetic approach to complexes of this type [6],... [Pg.276]

Many metal silyl complexes, especially those with early transition metals, have weak metal-silicon bonds. The molybdocene silyl hydride complexes seem to have molybdenum-silicon bonds of sufficient strength to withstand nucleophilic attack by strong hydride reagents (Eq. 4)... [Pg.278]

The reactions of molybdocene and tungstocene with N2 have been further investigated and the conclusion reached that, whilst molybdocene is a reactive species which co-ordinates N2, it does not provide an easy route to the reduction of this molecule. "... [Pg.129]


See other pages where Molybdocene is mentioned: [Pg.218]    [Pg.474]    [Pg.514]    [Pg.514]    [Pg.516]    [Pg.517]    [Pg.517]    [Pg.518]    [Pg.210]    [Pg.19]    [Pg.20]    [Pg.580]    [Pg.39]    [Pg.750]    [Pg.1032]    [Pg.1120]    [Pg.38]    [Pg.276]    [Pg.276]    [Pg.63]    [Pg.325]    [Pg.204]    [Pg.204]    [Pg.199]    [Pg.127]   
See also in sourсe #XX -- [ Pg.1038 ]

See also in sourсe #XX -- [ Pg.1038 ]

See also in sourсe #XX -- [ Pg.57 ]




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Molybdocene dichloride

Molybdocene-appended porphyrazines

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