A newly designed mixed-ligand coordination
polymer [Zn4(bdc)4(ppmh)2(H2O)]n (1) (H2bdc =
1,4-benzene dicarboxylic acid, ppmh = N-pyridin-2-yl-N′-pyridin-4-ylmethylene-hydrazine)
has been characterized using different physicochemical techniques.
The structure has been confirmed by single crystal X-ray diffraction
measurements. There are two pyridyl-N and one hydrazino-imine-N donor
centers in ppmh, where two pyridyl-Ns bind simultaneously
to two Zn(II) to serve as a bridging agent to form a coordination
polymer. The 1,4-benzene dicarboxylato (bdc) is ligated
via the aromatic dicarboxylato-O to form a one-dimensional (1D) chain.
These two 1D chains about Zn(II) constitute a two-dimensional structure,
which undergoes noncovalent interactions (C–H···π
and π···π) to generate a three-dimensional
supramolecular assembly. Electrical conductivity of 1 is higher by 1 order (1.37 × 10–6 S/cm) than
that of the free ligand, ppmh (6.2 × 10–7 S/cm). Especially, the responsivity of the compound 1 was 56.21 mA/W, which is 11 times higher than that of the ligand ppmh (5.12 mA/W). The specific detectivity of the compound
was 2.17 × 1010 Jones, which is also almost 10 times
higher with respect to the specific detectivity of the ligand-based
device (4.53 × 109 Jones). The results show that the
compound can be valuable for optoelectronic fields. The biological
studies suggest that compound 1 is antibacterial as well
as a promising anticancer agent (LD50, 42.2 μg/mL
against HepG2 cells), while ligands remain silent. Investigation of
the mechanism of the cell killing activity of compound 1 accounts the generation of intracellular reactive oxygen species.
This study presents the fabrication of a novel Zn(ii)-based 1D zigzag coordination polymer, which shows remarkably high photosensitivity and has the potential to be used in photoswitching devices and solar cells.
A one-dimensional Cu(II) coordination polymer with encapsulated
antiferromagnetically coupled binuclear Cu(II) has been synthesized
by using 5-nitroisophthalic acid (5-N-IPA) and 4-aminopyridine (4-APY)
[Cu2(5-N-IPA)2(4-APY)4]
n
(1). Electrical properties are examined
by complex impedance (Z*), dielectric permittivity
(ε*), and ac conductivity studies at different frequencies (10
kHz–5 MHz) and temperatures (253–333 K). The contribution
of grain and grain boundary has been explained by a different theoretical
model. The variable temperature magnetic susceptibility data for compound 1 were recorded between 300 and 2 K. The shape of the curve
(χM
T vs T) indicates
dominant antiferromagnetic coupling, which results from the interaction
between the copper(II) atoms.
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