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<p>A new tridentate amidine 2-(NC<sub>5</sub>H<sub>4</sub>)NHC(Bu<sup>t</sup>)=N-2,6-Me<sub>2</sub>C<sub>6</sub>H<sub>3</sub> (<b>1</b>) was synthesized by the reaction of 2-aminopyridine with imidoyl chloride 2,6-Me<sub>2</sub>C<sub>6</sub>H<sub>3</sub>[N=C(Cl)Bu<sup>t</sup>] in the presence of triethylamine in toluene. The deprotonation of <b>1</b> with KH in THF affords potassium amidinate {[2-(NC<sub>5</sub>H<sub>4</sub>)NC(Bu<sup>t</sup>)N-2,6-Me<sub>2</sub>C<sub>6</sub>H<sub>3</sub>]K}<sub>n</sub> (<b>2</b>), which, according to the X-ray diffraction data, is a coordination polymer. The exchange reaction of compound <b>2</b> with anhydrous LaCl<sub>3</sub> gives a new homoleptic lanthanum tris(amidinate) complex La[2-(NC<sub>5</sub>H<sub>4</sub>)NC(Bu<sup>t</sup>)=N-2,6-Me<sub>2</sub>C<sub>6</sub>H<sub>3</sub>]<sub>3</sub> (<b>3</b>) despite the molar ratio (1 : 1). The X-ray diffraction study demonstrated that each amidinate ligand in complex <b>3</b> is coordinated to the lanthanum ion in an unusual κ<sup>2</sup>-N<sub>Py</sub>, N mode through the nitrogen atom of the pyridine ring and one nitrogen atom of the amidinate moiety.</p>

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New pyridyl-containing amidine and specific features of its coordination to K+ and La3+ ions

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • N. Yu. Rad’kova,
  • A. V. Cherkasov,
  • D. M. Lyubov,
  • A. A. Trifonov

摘要

A new tridentate amidine 2-(NC5H4)NHC(But)=N-2,6-Me2C6H3 (1) was synthesized by the reaction of 2-aminopyridine with imidoyl chloride 2,6-Me2C6H3[N=C(Cl)But] in the presence of triethylamine in toluene. The deprotonation of 1 with KH in THF affords potassium amidinate {[2-(NC5H4)NC(But)N-2,6-Me2C6H3]K}n (2), which, according to the X-ray diffraction data, is a coordination polymer. The exchange reaction of compound 2 with anhydrous LaCl3 gives a new homoleptic lanthanum tris(amidinate) complex La[2-(NC5H4)NC(But)=N-2,6-Me2C6H3]3 (3) despite the molar ratio (1 : 1). The X-ray diffraction study demonstrated that each amidinate ligand in complex 3 is coordinated to the lanthanum ion in an unusual κ2-NPy, N mode through the nitrogen atom of the pyridine ring and one nitrogen atom of the amidinate moiety.