Syntheses, molecular and supramolecular structures, and magnetic properties of a mononuclear manganese(II) compound [Mn
II(LH)
2](ClO
4)
2 (
1) and a dicyanamide-bridged one-dimensional copper(II) compound [Cu
II(LH)(μ
1,5-dca)]
n(NO
3)
n (
2) derived from enolic 4-terpyridone (LH) have been described. The compounds
1 and
2 crystallize in monoclinic
P2(1)/n and triclinic
666055e6f30b3ae56c82412c51396""> space groups, respectively, with the following unit cell parameters –
1:
a = 8.8281(4) Å,
b = 8.7736(4) Å,
c = 39.7838(16) Å,
β = 95.719(1)°, and
Z = 4;
2:
a = 7.5342(3) Å,
b = 8.9307(4) Å,
c = 15.0189(8) Å,
α = 73.0032(15)°,
β = 81.3
701(16)°,
γ = 65.461(2)°, and
Z = 2. In
1, the metal center is hexacoordinated by three pyridine nitrogens of each of the two enolic 4-terpyridones. In
2, the metal center is pentacoordinated by three pyridine nitrogens of 4-terpyridone and two nitrogens of two end-to-end (EE; μ
1,5-) dicyanamide. The coordination geometries of
1 and
2 are distorted octahedral and distorted square pyramidal, respectively. Eight hydrogen bonds, six of C–H
O types and two of O–H
O types, link the complex cation [Mn
II(LH)
2]
2+ and two perchlorate anions into a three-dimensional network in
1. In the case of
2, seven hydrogen bonds, six of C–H
O types and one of O–H
O type, link the dicyanamide-bridged one-dimensional chains into a two-dimensional sheet consisting of interlinked one-dimensional double-chains. It may be noted that O–H group of enolic 4-terpyridone participates in hydrogen bonding interactions and in developing extended structures in both
1 and
2. Variable-temperature (2–300 K) magnetic susceptibility measurements of both the compounds have been performed to understand the possibility of spin transition in
1 and exchange interaction in
2. However, the susceptibility data of
1 indicate the existence of high-spin manganese(II) throughout the temperature range. In the case of
2, copper(II) centers are noninteracting which is related to the highly distorted coordination geometry of the metal ion.