Details

Autor(en) / Beteiligte

• Saha, Sandip
• Koner, Subratanath
• Tuchagues, Jean-Pierre
• Boudalis, Athanassios K
• Okamoto, Ken-Ichi
• Banerjee, Surajit
• Mal, Dasarath

Titel

Cation-Dependent Nuclearity of the Copper−Azido Moiety:  Synthesis, Structure, and Magnetic Study

Ist Teil von

• Inorganic chemistry, 2005-09, Vol.44 (18), p.6379-6385

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2005

Quelle

MEDLINE

Beschreibungen/Notizen

• Mono-, di-, and trinuclear copper−azido moieties have been synthesized by varying the size of the countercations. [Bu4N]+ yielded a [Cu2(N3)6]2- copper−azido moiety in [Bu4N]2[Cu2(μ1,1-N3)2(N3)4], 1, and [Pr4N]+ yielded a [Cu3(N3)8]2- moiety in {[Pr4N]2[Cu3(μ1,1-N3)4(N3)4]} n , 2, in which symmetry-related [Cu3(N3)8]2- moieties are doubly μ1,1-azido bridged to form unprecedented infinite zigzag chains parallel to the crystallographic a-axis. In the case of [Et4N]+, the mononuclear species [Et4N]2[Cu(N3)4], 3, has been formed. All complexes have been characterized structurally by single-crystal X-ray analysis:  1, C32H72N20Cu2, triclinic, space group P1̄, a = 10.671(9) Å, b = 12.239(9) Å, c = 10.591(5) Å, α = 110.01(4)°, β = 93.91(5)°, γ = 113.28(5)°, V = 1160.0(1) Å3; 2, C24H56N26Cu3, monoclinic, space group P21/n, a = 8.811(2) Å, b = 37.266(3) Å, c = 13.796(1) Å, β = 107.05(1)°, V = 4330.8(10) Å3; 3, C16H40N14Cu, tetragonal, space group I4/m, a = b = 10.487(1) Å, c = 12.084(2) Å, V = 1328.9(3) Å3. The variable-temperature magnetic susceptibility measurements showed that although the magnetic interaction in [Bu4N]2[Cu2(μ1,1-N3)2(N3)4], 1, is antiferromagnetic (J = −36 cm-1), it is ferromagnetic in {[Pr4N]2[Cu3(μ1,1-N3)4(N3)4]} n , 2 (J = 7 cm-1). As expected, the [Et4N]2[Cu(N3)4] complex, 3, is paramagnetic.