Copper(II) and V
IVO complexes of an open chain(1:2) Schiff-base ligand (H
2L1), derived by thetemplatecondensation of diaminomaleonitrile (DMN) and salicy
laldehyde, anddicopper(II) complexes of (2:2) macrocyclicSchiff-base ligands derived by template condensation of diformylphenolsand diaminomaleonitrile, have beensynthesized and studied. Structures have been established for thefirst time for mononuclear Cu(II) andV
IVOderivatives of the open chain ligand H
2L1 (1:2), adinuclear macrocyclic Cu(II) complex derived from a2:2macrocyclic ligand (H
2M1), and the half-condensed 1:1salicy
laldehyde ligand (H
2L2). [Cu(L1)](
1) (L1 =C
18H
10N
4O
2)crystallized in the monoclinic system, space group
P2
1/
n (No. 14), with
a =11.753(6) Å,
b =7.708(5) Å,
c = 16.820(1) Å, and
Z= 4. [VO(L1)(DMSO] (
2) crystallized inthe orthorhombic system, spacegroup
Pbca (No. 61), with
a = 22.534(9)Å,
b = 23.31(1) Å,
c = 7.694(5)Å, and
Z = 8. H
2L2(C
18H
8N
4O)(
3)crystallized in the monoclinic system, space group
P2
1/
c (No. 14), with
a =13.004(6) Å,
b = 11.441(7) Å,
c=7.030(4) Å, and
Z = 4.[Cu
2(M3)](CH
3COCH
3)(
4) (M3 =C
32H
24N
8O
4)crystallized in the monoclinic system,space group
C2/
c (No. 15), with
a =38.33(2) Å,
b = 8.059(4) Å,
c =22.67(2) Å, and
Z = 8.[Cu(L3)(DMSO)](
5) (L3 =C
20H
14N
2O
4)crystallized in the triclinic system, space group
P(No. 2), with
a = 10.236(4) Å,
b=13.514(4) Å,
c = 9.655(4) Å, and
Z= 2.
4 results from the unique addition of twoacetone molecules to twoimine sites in[Cu
2(M1)](ClO
4)
2 (M1= 2:2 macrocyclic ligand derived from template condensation of DM
Nand2,6-diformyl-4-methylphenol).
4 has extremely smallCu-OPh-Cu bridge angles (92.0, 92.8
), well belowtheexpected lower limit for antiferromagnetic behavior, but is stillantiferromagnetically coupled (-2
J = 25.2cm
-1).This behavior is associated with a possible antiferromagneticexchange term that involves the conjugated frameworkof the macrocyclic ligand itself. The ligand L3 in
5results from hydrolysis of M1 on recrystallization of[Cu
2(M1)](ClO
4)
2 from undrieddimethyl sulfoxide.