PREPARATION AND CRYSTAL-STRUCTURES OF LACL3(15-CROWN-5) AND 2)(MU-CL)](2)CENTER-DOT(15-CROWN-5)CENTER-DOT-MECN

LaCl3(15-crown-5), I was prepared by the reaction of LaCl(3)nH(2)O wit h 15-crown-5 and bipy (2,2'-bipyridyl). [LaCl2(phen)(H2O)(2)(mu-Cl)](2 ) .(15-crown-5). MeCN, II, was crystallized from a mixture of LaC1(3) . nH(2)O, phen (1,10-phenanthroline) and 15-crown-5 in MeOH/MeCN, Crys tal structures of these two complexes have been determined by X-ray me thods. The La(III) ion in I is coordinated by three Cl anions and five oxygen atoms of a crown ether. The two metal ions in II are bridged b y two Cl anions and the crown ligand is hydrogen-bonded to the coordin ated water molecules to form polymeric... crown/cation/cation/crown... chains.