The First (Trisulfoxide)metal Complexes: Synthesis and Crystal Structures of the 1D Lanthanide Coordination Polymers [Ln(L)(MeOH)(NO 3 ) 3 ] n and {[La(L)(DMF) 5 ](ClO 4 ) 3 } n [L = 1,3,5‐Tris(ethylsulfinyl)‐2,4,6‐trimethylbenzene, Ln = La III and Nd III ]

A new trisulfoxide ligand, 1,3,5‐tris(ethylsulfinyl)‐2,4,6‐trimethylbenzene (L), was designed and synthesized, and treated with Ln(NO 3 ) 3 or Ln(ClO 4 ) 3 to produce three coordination polymers: [Ln(L)(MeOH)(NO 3 ) 3 ] n [where Ln = La III ( 1 ); Nd III ( 2 )] and {[La(L)(DMF) 5 ](ClO 4 ) 3 } n ( 3 ). Solid‐state structures of all three complexes were determined by single‐crystal X‐ray diffraction. The three complexes have 1D helical‐chain structures and complexes 1 and 2 are isostructural. To the best of our knowledge, these coordination polymers are the first examples of (trisulfoxide)metal complexes. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)