A Dinuclear Dysprosium-2-quinolinecarboxylate-1,10-Phenanthroline Compound:Crystal Structure and Magnetism

A dinuclear dysprosium（III） compound,[Dy;（μ;-OH）;（QLC）;（1,10-phen）;]·4H;O（1）(QLC-= 2-quinolinecarboxylate and 1,10-phen = 1,10-phenanthroline),was synthesized and structurally and magnetically characterized.Compound 1 crystallizes in triclinic system,space group P1 with a = 10.9439（3）,b = 11.2823（3）,c = 12.2323（4） ?,α = 107.446（3）,β = 91.700（3）,γ = 91.511（2）°,V = 1439.25（8） ?;,Z = 1,C;H;N;O;Dy;,Mr = 1480.12,Dc = 1.708 g/cm3,μ = 2.653 mm-1 and F（000） = 734.The final R = 0.0366 and w R = 0.0736 for 5816 observed reflections with I > 2σ（I）.Compound 1 contains the mononuclear [Dy（QLC）;（1,10-phen）] subunit formed from one 1,10-phen and two QLC-ligands chelating Dy（III） ion.Two mononuclear [Dy（QLC）;（1,10-phen）] subunits are bridged by a pair of μ;-OH groups to give a centrosymmetric dinuclear [Dy;（μ2-OH）;（QLC）4（1,10-phen）;] with each Dy（III） ion being eight-coordinated.Detailed susceptibility measurements revealed that compound 1 does not show slow magnetic relaxation under zero direct-current field but exhibits field-induced slow magnetic relaxation under 2 kOe applied field.