7-COORDINATE MANGANESE(II) COMPLEXES OF 2,6-BIS[1-(2-HYDROXYETHYLIMINO)ETHYL]PYRIDINE

Diaqua{2,6-bis[1-(2-hydroxyethylimino)-ethyl]pyridine-N,N',N'',O,O'}manganese(II) diper-chlorate, [Mn(L)(H2O)2](ClO4)2 (L = C13H19N3O2) (I), M(r) = 539.2, monoclinic, C2/c, a = 16.142 (3), b = 12.222 (3), c = 11.047 (3) angstrom, beta = 94.41(2)-degrees, V = 2173 (1) angstrom3, Z = 4, D(x) = 1.648 Mg m-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 0.893 mm-1, F(000) = 1108, T = 293 K, final R = 0.064 for 1684 [F > 6sigma(F)] independent observed reflections. {2,6-Bis[1-(2-hydroxyethyl-imino)ethyl]pyridine-N,N',N'',O,O'}bis(thiocyanato-N)manganese(II), [Mn(L)(NCS)2] (II), M(r) = 420, monoclinic, I2/a, a = 9.902 (2), b = 12.581 (2), c = 15.203 (3) angstrom, beta = 101.46 (2)-degrees, V = 1856.2 (6) angstrom3, z = 4, D(x) = 1.504 Mg m-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 0.917 mm-1, F(000) = 868, T = 293 K, final R = 0.043 for 1505 [F>6sigma(F)] independent observed reflections. Bisazido{2,6-bis[1-(2-hydroxyethyl-imino)ethyl]pyridine-N,N',N'',O,O'}manganese(II), [Mn(L)(N3)2] (III), M(r) = 388, orthorhombic, Pbcn, a = 18.643 (7), b = 12.616 (3), c = 7.127 (3) angstrom, V = 1676 (1) angstrom3, Z = 4, D(x) = 1.539 Mg m-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 0.783 mm-1, F(000) = 804, T = 173 K, final R = 0.041 for 818 [F > 6sigma(F)] independent observed reflections. In each structure the Mn coordination geometry is approximately pentagonal bipyramidal with the five donors from the ligand L occupying the pentagonal plane. There is extensive hydrogen bonding in each structure.