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Tale of Three Molecular Nitrides: Mononuclear Vanadium (V) and (IV) Nitrides As Well As a Mixed-Valence Trivanadium Nitride Having a V3N4 Double-Diamond Core

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.2c00276· OSTI ID:1923254
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [4];  [3];  [4];  [5];  [6];  [2];  [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Friedrich-Alexander-University Erlangen-Nürnberg (FAU) (Germany)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  5. Roosevelt University, Chicago, IL (United States)
  6. Argonne National Lab. (ANL), Lemont, IL (United States)
Here, transmetallation of [VCl3(THF)3] and [TlTptBu,Me] afforded [(TptBu,Me)VCl2] (1, TptBu,Me = hydro-tris(3-tert-butyl-5-methylpyrazol-1-yl)borate), which was reduced with KC8 to form a $$C_{3v}$$ symmetric VII complex, [(TptBu,Me)VCl] (2). Complex 1 has a high-spin ($$\textit{S}$$ = 1) ground state and displays rhombic high-frequency and -field electron paramagnetic resonance (HFEPR) spectra, while complex 2 has an $$\textit{S}$$ = 3/2 4A2 ground state observable by conventional EPR spectroscopy. Complex 1 reacts with NaN3 to form the VV nitride-azide complex [(TptBu,Me)V≡N(N3)] (3). A likely VIII azide intermediate en route to 3, [(TptBu,Me)VCl(N3)] (4), was isolated by reacting 1 with N3SiMe3. Complex 4 is thermally stable but reacts with NaN3 to form 3, implying a bis-azide intermediate, [(TptBu,Me)V(N3)2] (A), leading to 3. Reduction of 3 with KC8 furnishes a trinuclear and mixed-valent nitride, [{(TptBu,Me)V}2($$μ_{4-}$$VN4)] (5), conforming to a Robin–Day class I description. Complex 5 features a central vanadium ion supported only by bridging nitride ligands. Contrary to 1, complex 2 reacts with NaN3 to produce an azide-bridged dimer, [{(TptBu,Me)V}2(1,3-$$μ_2$$-N3)2] (6), with two antiferromagnetically coupled high-spin VII ions. Complex 5 could be independently produced along with [($$κ_2$$-TptBu,Me)2V] upon photolysis of 6 in arene solvents. The putative {VIV≡N} intermediate, [(TptBu,Me)V≡N] (B), was intercepted by photolyzing 6 in a coordinating solvent, such as tetrahydrofuran (THF), yielding [(TptBu,Me)V≡N(THF)] (B-THF). In arene solvents, B-THF expels THF to afford 5 and [($$κ_2$$-TptBu,Me)2V]. A more stable adduct (B-OPPh3) was prepared by reacting B-THF with OPPh3. These adducts of B are the first neutral and mononuclear VIV nitride complexes to be isolated.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Laboratory Computing Resource Center (LCRC)
Sponsoring Organization:
Carlsberg Foundation; Independent Research Fund Denmark; National Institutes of Health (NIH); National Science Foundation (NSF); State of Florida; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; University of Pennsylvania
Grant/Contract Number:
AC02-06CH11357; SC0019342
OSTI ID:
1923254
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 23 Vol. 144; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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