Complexes with Hg(II) and macrocyclic ligands

The crystal structures of 1,4,7,10,13,16-hexaoxa-cyclooctadecane dicyano me rcury(II) monohydrate, C14H24HgN2O6. H2O, 1, and 2,5,8,11,18,21,24,27-octao xa-tricyclo[26.4.0.0(12,17)]-dotri- conta-1(28),12,14,16,29,31-hexaene dicy ano mercury(II) monohydrate, C26H32HgN2O8. H2O, 2, were determined: 1 cryst allizes in the trigonal space group <R(3)over bar> with cell dimensions a = 11.7842(1) and c = 12.0316(1) Angstrom. 2 crystallizes in the monoclinic s pace group P2(1)/c with cell dimensions a = 11.156(3) Angstrom, b = 8.417(2 ), c = 30.901(8) Angstrom, and beta = 93.279 degrees. In spite of the diffe rent cyclic systems, similar complexes are formed where the Hg atom is coor dinated by two CN groups and six oxygen atoms of the crown ether. The struc ture of 1 is isostructural with the crystal structures of 18C6-HgCl2, 18C6- CdBr2, 18C6--Sr(BH4)(2), and 18C6-Ba(BH4)(2). Furthermore, 1 is very simila r to other 18C6-HgX2 complexes.