Polynuclear complexes with hydrogen-bonded bridges. 4. Structure and magnetic properties of dinuclear copper(II) complexes of amino alcohols

J. A. Bertrand, Etsuko Fujita, D. G. VanDerveer

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Abstract

The structures and magnetic properties of the copper(II) complexes of 2-aminoethanol (EtaH), [Cu(EtaH)(Eta)]2(NO3)2, and 2-amino-2-methylpropanol (MepH), [Cu(MepH)(Mep)(H2O)]2(NO3)2, have been investigated. The compound [Cu(EtaH)(Eta)]2(NO3)2 crystallizes in space group P1 (a = 9.990 (2) Å, b = 11.454(1) Å, c = 9.977 (2) Å, α = 111.10 (1)°, β = 90.02 (1)°, and γ = 119.92 (1)° at 25°C with Mo Kα radiation) with 2 formula units per unit cell (ρcalcd = 1.816 g cm-3, ρobsd 1.823 g cm-3), and the structure was refined to a conventional R value of 0.049 by full-matrix least-squares refinement. The structure consists of two independent dinuclear cations and uncoordinated nitrate anions; each dinuclear cation is made up of two cis-bis(2-aminoethanolato)copper(II) complexes related by inversion symmetry and joined by two hydrogen bonds (oxygen-oxygen distances of 2.43-2.45 Å). The compound [Cu(MepH)(Mep)(H2O)]2(NO3)2 crystallizes in space group P21/c (a = 6.232 (1) Å, b = 14.036 (4) Å, c = 17.097 (4) Å, β = 105.79 (2)°) with 2 formula units per unit cell (ρcalcd = 1.481 g cm-3, ρobsd = 1.476 g cm-3), and the structure was refined to a conventional R value of 0.041 by full-matrix least-squares refinement. The structure contains a dinuclear cation made up of two square-pyramidal copper(II) complexes related by inversion symmetry and joined by two hydrogen bonds (oxygen-oxygen distance of 2.516 (3) Å). Both compounds show antiferromagnetic coupling (2J values of -56 cm-1 and -70 cm-1 for the EtaH and MepH compounds, respectively) that is weaker than that observed for the hydrogen-bonded (oxygen-oxygen distance of 2.31 Å) complex of copper(II) and the diimine of 2,4-pentanedione and 2-aminoethanol (2J = -94 cm-1). There is no direct correlation of coupling constants with either oxygen-oxygen distances or copper-copper distances for these compounds.

Original languageEnglish
Pages (from-to)2022-2028
Number of pages7
JournalInorganic Chemistry
Volume19
Issue number7
Publication statusPublished - 1980

ASJC Scopus subject areas

  • Inorganic Chemistry

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