Constrained ferromagnetic coupling in dinuclear μ1,3-azido nickel(II) cryptate compounds. Crystal structure and magnetic behaviour of [Ni2(L1)(N3)(H2O)][CF3SO3]3·2H2O·EtOH {L1 = N[(CH2)2NHCH2(C6H4-m)CH2NH(CH2)2]3N} †

The new dinuclear compounds [Ni2(L1)(N3)(H2O)][CF3SO3]3·4H2O 1, [Ni2(L1)(N3)][ClO4]3·MeCN· 2H2O 2, [Co2(L1)(N3)][ClO4]3·H2O 3, and [Mn2(L2)(N3)][CF3SO3]3 4 have been prepared {L1 = N[(CH2)2NHCH2(C6H4-m)CH2NH(CH2)2]3N; L2 = N[(CH2)2NHCH2(C6H4-p)CH2NH(CH2)2]3N}. The crystal structure of [Ni2(L1)(N3)(H2O)][CF3SO3]3·2H2O·EtOH: has been determined. From magnetic measurements 1 and 2 show ferromagnetic coupling, whereas 3 and 4 show antiferromagnetic coupling. The best fit parameters are: 2J = 11.82 cm–1, g = 2.13, D = 0.096 cm–1 and 2z′J′ = –0.72 cm–1 for 1, 2J = 7.72 cm–1, g = 2.12, D = –2.38 cm–1 and 2z′J′ = –0.95 cm–1 for 2, 2J = –4.1 cm–1, g = 2.11 for 3, and 2J = –12.1 cm–1, g = 1.98 for 4. The magnetic results can be correlated with those predicted on the basis of an earlier model.