Reaction of K-3[Cr(ox)(3)] (ox = oxalate) with nickel(II) and tris(2-aminoe
thyl)amine (tren) in aqueous solution resulted in isolation of the bimetall
ic assembly [Ni-3(tren)(4)(H2O)(2)][Cr(ox)(3)](2). 6H(2)O. The polymeric co
mplex {[Ni-2(tren)(3)][ClO4](4). H2O}(n) has been prepared by reaction of n
ickel(II) perchlorate and tren in aqueous solution. From the same reaction
mixture the complex [Ni-2(tren)(2)(aepd)][ClO4](4). 2H(2)O (aepd = N-(2-ami
noethyl)pyrrolidine-3,4-diamine), in which a bridging tren ligand contains
a carbon-carbon bond between two arms forming a substituted pyrrolidine, ha
s been isolated. The complexes have been characterized by X-ray crystallogr
aphy. The magnetic susceptibility (300-4.2 K) and magnetization data (2, 4
K, H = 0-5 T) for {[Ni-2(tren)(3)][ClO4](4). H2O}(n) (300 K , 4.23 mu(B)) e
xhibit evidence of weak antiferromagnetic coupling and zero field splitting
(2J = -1.8 cm(-1); \ D\ = 2 cm(-1)) at low temperature. For [Ni-3(tren)(4)
(H2O)(2)][Cr(ox)(3)](2). 6H(2)O the susceptibility data at 300 K are indica
tive of uncoupled nickel(II) and chromium(III) sites with zero-field splitt
ing and intramolecular antiferromagnetic coupling predicted at low temperat
ure.