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N2 activation on a molybdenum-titanium-sulfur cluster.

Yasuhiro Ohki1, Keisuke Uchida2, Mizuki Tada2,3

  • 1Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan. ohki@chem.nagoya-u.ac.jp.

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|August 12, 2018
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Researchers activated nitrogen gas (N2) using a novel molybdenum-titanium metal-sulfur cluster. This cluster converts N2 into ammonia (NH3) and hydrazine (N2H4) with acids and a reducing agent.

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Area of Science:

  • Bioinorganic Chemistry
  • Materials Science
  • Catalysis

Background:

  • Nitrogenase's iron-molybdenum cofactor (FeMo-cofactor) facilitates dinitrogen (N2) to ammonia (NH3) conversion.
  • Synthesizing metal-sulfur clusters for N2 activation remains a significant challenge.
  • Even extracted FeMo-cofactors show limited N2 reduction capabilities.

Purpose of the Study:

  • To report the activation of N2 using a novel metal-sulfur cluster.
  • To investigate the catalytic conversion of N2 into valuable nitrogenous compounds.

Main Methods:

  • Synthesis of a novel metal-sulfur cluster containing molybdenum and titanium.
  • Utilizing a bridging N2 moiety within two [Mo3S4Ti] cubes.
  • Treatment with Brønsted acids and a reducing agent to induce N2 conversion.

Main Results:

  • Successful activation of a bridging N2 moiety.
  • Conversion of the activated N2 into ammonia (NH3) and hydrazine (N2H4).
  • Demonstration of N2 reduction under specific chemical conditions.

Conclusions:

  • A molybdenum-titanium metal-sulfur cluster can activate N2.
  • This cluster facilitates the reduction of N2 to NH3 and N2H4.
  • Offers a new avenue for artificial nitrogen fixation research.