Syntheses and Crystal Structures of Di-, Tri- and Tetra-nuclear Cobalt(II)-Lanthanide(III)Carboxylate Complexes

摘要

Reaction of Co(NO3)2.6H2O, Ln(NO3)3.6H2O, pivalic acid andquinoline in different stoichiometric molar ratios in EtOH produced three structural types of carboxylate-bridged cobalt(II)-lanthanide(III) compounds, [CoDy(O2CCMe3)5(C9H7N)(H2O)].0.5C9H7N 1, [Co2Ce(O2CCMe3)6(C9H7N)2(NO3)] 2 and [Co2Y2(O2CCMe3)8(C9H7N)2(NO3)2] 3. Complex 1 crystallizes in triclinic space group P, with a=12.2457(5), b = 13.3210(5), c=15.0938(6) Å, α=111.574(1), β=93.486(1), γ=102.398(4)°, V=2209.60(15) Å3 and Z=2. Complex 2 crystallizes in triclinic space group P, with a=11.895(3), b=12.6941(4), c=22.1633(7)Å, α=98.52(1), β=98.01(2), γ=117.07(2)°, V=2864.7(7) Å3 and Z=2. Finally, complex 3 crystallizes in triclinic space group P, with a=10.9407(6), b=12.4501(6), c = 13.7881(7) Å, α=85.772(1), β=84.510(2), γ=73.180(1)°, V=1787.4(2)Å3 and Z=1. In the three above cases, the neighboring cobalt(II) and lanthanide(III) ions are bridged by three pivalate ligands in the syn-syn modes with the intermetallic～ distances of 3.977(1), 4.097(1) and 3.922(8) Å for 1-3, respectively.