Crystal Structure and Magnetic Behaviour of the New Gadolinium Complex Compound Gd 2 (ClH 2 CCOO) 6 (bipy) 2

Single crystals of the title compound have been obtained by reaction of Gd 3 (ClH 2 CCOO) 9 (H 2 O) 5 with 2,2′‐bipyridyl (bipy) in a solution of ethanol and water. Gd 2 (ClH 2 CCOO) 6 (bipy) 2 crystallises in the triclinic space group P $\bar {1}$ ( Z = 2) with a = 959.5(3) pm, b = 980.9(3) pm, c = 1163.9(4) pm, α = 68.67(3) °, β = 84.82(4)° and γ = 82.47(4)°. The crystal structure is built up of discrete molecules of dinuclear Gd 3+ –Gd 3+ units. The corresponding residual (all data) for the refined structure is 4.46 %. The magnetic behaviour of the compound was investigated in the temperature range of 1.76–300 K. The magnetic data were interpreted considering exchange interactions within the dimeric unit ( J ex = –0.020 cm –1 ). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)