Synthesis and crystal structure of a 1D disulfoxide-lanthanide(III) complex {[La(L) 2 (DMF) 4 ](ClO 4 ) 3 } n [L  =  1,6-bis(ethylsulfinyl)hexane].

A new disulfoxide-La(III) complex {[La(L) 2 (DMF) 4 ](ClO 4 ) 3 } n (1) has been prepared by the reaction of La(ClO 4 ) 3   ·   n H 2 O and a flexible disulfoxide ligand, 1,6-bis(ethylsulfinyl)hexane (L), and characterized by elemental analysis, IR and single-crystal X-ray diffraction analysis (monoclinic system, space group C 2/ c , with a   =  24.94(2), b   =  12.012(8), c   =  20.81(1)  Å, β  =  117.57(1)°, V   =  5527(6)  Å 3 and Z   =  4). The crystal structure consists of polymeric chains of {[La(L) 2 (DMF) 4 ] 3+ } n cations and anions. In the cation of 1, each La(III) center is coordinated to eight O atoms from four distinct L ligands and four DMF molecules to give a square antiprism coordination geometry. The adjacent two La(III) ions are linked by two L ligands, which adopt bis-monodentate O-coordination bridging mode to form a double-bridging zigzag chain containing 22-membered macrocycles. [ABSTRACT FROM AUTHOR]