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Catalytic Dinitrogen Reduction to Ammonia at a Triamidoamine-Titanium Complex.


ABSTRACT: Catalytic reduction of N2 to NH3 by a Ti complex has been achieved, thus now adding an early d-block metal to the small group of mid- and late-d-block metals (Mo, Fe, Ru, Os, Co) that catalytically produce NH3 by N2 reduction and protonolysis under homogeneous, abiological conditions. Reduction of [TiIV (TrenTMS )X] (X=Cl, 1A; I, 1B; TrenTMS =N(CH2 CH2 NSiMe3 )3 ) with KC8 affords [TiIII (TrenTMS )] (2). Addition of N2 affords [{(TrenTMS )TiIII }2 (?-?1 :?1 -N2 )] (3); further reduction with KC8 gives [{(TrenTMS )TiIV }2 (?-?1 :?1 :?2 :?2 -N2 K2 )] (4). Addition of benzo-15-crown-5 ether (B15C5) to 4 affords [{(TrenTMS )TiIV }2 (?-?1 :?1 -N2 )][K(B15C5)2 ]2 (5). Complexes 3-5 treated under N2 with KC8 and [R3 PH][I], (the weakest H+ source yet used in N2 reduction) produce up to 18?equiv of NH3 with only trace N2 H4 . When only acid is present, N2 H4 is the dominant product, suggesting successive protonation produces [{(TrenTMS )TiIV }2 (?-?1 :?1 -N2 H4 )][I]2 , and that extruded N2 H4 reacts further with [R3 PH][I]/KC8 to form NH3 .

SUBMITTER: Doyle LR 

PROVIDER: S-EPMC6003280 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Catalytic Dinitrogen Reduction to Ammonia at a Triamidoamine-Titanium Complex.

Doyle Laurence R LR   Wooles Ashley J AJ   Jenkins Lucy C LC   Tuna Floriana F   McInnes Eric J L EJL   Liddle Stephen T ST  

Angewandte Chemie (International ed. in English) 20180423 21


Catalytic reduction of N<sub>2</sub> to NH<sub>3</sub> by a Ti complex has been achieved, thus now adding an early d-block metal to the small group of mid- and late-d-block metals (Mo, Fe, Ru, Os, Co) that catalytically produce NH<sub>3</sub> by N<sub>2</sub> reduction and protonolysis under homogeneous, abiological conditions. Reduction of [Ti<sup>IV</sup> (Tren<sup>TMS</sup> )X] (X=Cl, 1A; I, 1B; Tren<sup>TMS</sup> =N(CH<sub>2</sub> CH<sub>2</sub> NSiMe<sub>3</sub> )<sub>3</sub> ) with KC<sub>  ...[more]

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