Synthesis, characterization and crystal structures of mono-, di- and trinuclear rhenium(I) tricarbonyl complexes with 2,3,5,6-tetra(2-pyridyl)pyrazine

Xiaoyuan Chen, Frank J. Femia, John W. Babich, Jon A Zubieta

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Abstract

A series of rhenium(I) tricarbonyl complexes with the ligand 2,3,5,6-tetra(2-pyridyl)pyrazine (tppz) were synthesized and characterized crystallographically. Two different coordination modes were found when tppz functions as a monobidentate ligand. Rhenium(I) may be bound to tppz through pyrazine and pyridyl nitrogens completing a 5-membered coordination ring when the reaction was carried out in toluene. However, the same reaction in methanol produced a yellow complex in which rhenium(I) was bound to tppz through two adjacent pyridyl nitrogens with a 7-membered coordination ring. In the presence of an excess amount of [ReBr(CO)5], the dinuclear complex [{ReBr(CO)3}2(μ-tppz)] (3) was isolated, while the trinuclear complex [{ReCl(CO)3}3(μ-tppz)] (4) was obtained in the case of [ReCl(CO)5]. Crystal data for 1, C27H16ClN6O3Re·MeOH: monoclinic, P21/n, a = 9.2217(7), b = 10.7628(8), c = 26.932(2) Å, β = 94.130(1)°, V = 2666.1(3) Å3, Z = 4. 2, C27H16BrN6O3Re: monoclinic, P21/n, a = 9.2931(6), b = 10.2387(7), c = 27.993(2) Å, β = 94.615(1)°, V = 2654.8(3) Å3, Z = 4. 1′, C27H16ClN6O3Re· 2H2O: monoclinic, C2/c, a = 18.584(4), b = 21.693(5), c = 15.392(4) Å, β = 122.328(3)°, V = 5243(2) Å3, Z = 8. 3, C30H16Br2N6O6 Re2: triclinic, P1̄, a = 7.4668(6), b = 11.4902(10), c = 19.3736(16) Å, α = 73.659(2), β = 85.183(2), γ = 77.097(1)°, V = 1554.3(2) Å3, Z = 2. 4, C33H16Cl3N6O9 Re3·1/2C6H6: orthorhombic, Pbca, a = 18.828(1), b = 16.715(1), c = 25.366(2) Å, V = 7983.2(10) Å3, Z = 8.

Original languageEnglish (US)
Pages (from-to)66-72
Number of pages7
JournalInorganica Chimica Acta
Volume315
Issue number1
DOIs
StatePublished - Apr 16 2001

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Keywords

  • Bidentate complexes
  • Carbonyl complexes
  • Crystal structures
  • Rhenium complexes

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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