A novel
mixed ligand one-dimensional coordination polymer (1D CP), {[Cd2(adc)2(4-nvp)6]·(MeOH)·(H2O)}
n
(1; H2adc = 9,10-anthracenedicarboxylic acid, and 4-nvp = 4-(1-naphthylvinyl)pyridine),
has been synthesized and structurally characterized by single crystal
X-ray crystallography. The 1D polymer undergoes supramolecular aggregation
via hydrogen bonding, C–H···π, and π···π
interactions. Interestingly, compound 1 shows increasing
conductivity upon irradiation of light. Therefore, it has the potential
to be used in optoelectronic devices. Moreover, the supramolecular
assembly of 1 specifically detects Cr3+ cation
in the presence of other competitive analytes. Most importantly, compound 1 exhibits fascinating turn-on Cr3+ sensing, which
seems to be an ornament in the field of sensing application.
A 1D coordination polymer exhibits photosalient effect due to photochemical [2+2] cycloaddition reaction by UV as well as sunlight irradiation accompanied by the release of free cyclobutane ligand.
A pair of 4-(1-naphthylvinyl)pyridine (4-nvp) ligands has been successfully aligned in head-to-tail fashion in a one-dimensional (1D) double chain ladder polymer [Cd(adc)(4-nvp)(HO)] (1; Hadc = acetylenedicarboxylic acid) that undergoes a photochemical [2 + 2] cycloaddition reaction accompanied by single-crystal to single-crystal (SCSC) structural transformation from a 1D chain to a 2D layer structure. These structural changes have a significant impact on the conductivity and Schottky nature of the compound.
Three new coordination polymers (CPs) of coordinated isoniazid (INH) to Zn(II) with succinic acid (H 2 succ), fumaric acid (H 2 fum), and terephthalic acid (H 2 bdc) as organic linker, [Zn(INH)(succ)] n (1), [Zn(INH)(fum)] n (2), and [Zn(INH)(bdc)] n (3), respectively, have been characterized. The structure determination by the single crystal X-ray diffraction technique shows a ZnN 2 O 4 distorted octahedral geometry, and the 1D chain is constituted via the INH and carboxylate coordination along with the hydrogen bonding (N−H•••O) which comprises a 2D structure. The CPs, 1 and 2, are isostructural and fabricate supramolecular networks by inclined intercatenation of two 2D layers, while 3 shows parallel intercatenation. The electrical conductivity and Schottky barrier diode behavior have been established by the charge transport mechanism of the compounds at the quasi-Fermi level state. The analysis indicates that the compound 1 has the highest mobility (2.53 × 10 −10 m 2 V −1 s −1 ) than 2 (1.86 × 10 −10 m 2 V −1 s −1 ) and 3 (1.89 × 10 −10 m 2 V −1 s −1 ) and the highest electrical conductivity (2.26 × 10 −4 S m −1 ) than the others (1.12 × 10 −4 S m −1 (2) and 1.25 × 10 −4 S m −1 (3)). DFT computation of the structural motif of CPs has calculated the band gap (ΔE: 3.93 eV (1), 4.45 eV (2), 4.26 eV (3)), which supports the progression of conductivity.
The
real-time application of piezoelectric nanogenerators (PNGs)
under a harsh environment remains a challenge due to lower output
performance and poor durability. Thus, the development of flexible,
sensitive, and stable PNGs became a topic of interest to capture different
human motions including gesture monitoring to speech recognition.
Herein, a scalable approach is adapted where naphthylamine bridging
a [Cd(II)-μ-I4] two-dimensional (2D) metal–organic
framework (MOF)-reinforced poly(vinylidene fluoride) (PVDF) composite
nanofibers mat is prepared to fabricate a flexible and sensitive composite
piezoelectric nanogenerator (C-PNG). The needle-shaped MOF was successfully
synthesized by the layering and diffusion of two different solutions.
The incorporation of single-crystalline 2D MOF ensures a large content
of electroactive phases (98%) with a resultant high-magnitude piezoelectric
coefficient of 41 pC/N in a composite nanofibers mat due to the interfacial
specific interaction with −CH2–/–CF2– dipoles of PVDF. As an outcome, C-PNG generates high
electrical output (open-circuit voltage of 22 V and maximum power
density of 24 μW/cm2) with a very fast response time
(t
r ≈ 5 ms) under periodic pressure
imparting stimuli. Benefiting from bending and twisting functionality,
C-PNG is capable of scavenging biomechanical energy by mimicking complex
musculoskeletal motions that broaden its application in wearable electronics
and fabric integrated medical devices. In addition, C-PNG also demonstrates
an efficient acoustic vibration to electric energy conversion capability
with an improved power density and acoustic sensitivity of 6.25 μW
and 0.95 V/Pa, respectively. The overall energy conversion efficiency
is sufficient to operate several consumer electronics without any
energy storage unit. This acoustic observation is further validated
by the finite element method-based theoretical simulation. Overall,
the 2D MOF-based device design strategy opens up a new possibility
to develop a human-motion compatible energy generator and a self-powered
acoustic sensor to power up electronic gadgets as well as low-frequency
noise detection.
On account of the easy functionality and structural diversity, coupled with superior thermal stability of coordination polymers (CPs), many researchers prompted to explore the opportunity of introducing these hybrid materials...
Three Cd(II) based coordination polymers
(CPs) (1–3) are designed using 3-aminoquinoline
and 5-aminoquinoline
based Schiff base ligands and thiocyanate and dicyanamide as bridging
ligands. Pseudohalide linkers play a crucial role in the architecture
of the CPs. These compounds are prepared under an ambient condition
with high yield. The I–V characteristics
of the 1–3 based thin film devices
(Al/complex interface) under dark and illumination conditions are
nonlinear rectifying nature, which is the signature of a Schottky
barrier diode (SBD). The rectification ratio (I
on/I
off) of the SBDs under dark
condition at ±2 V has been obtained as 16.41, 15.48, and 14.73
and under illumination conditions; the same has been evaluated as
67.18, 46.23, and 37.69 for 1, 2, and 3, respectively. The photoresponsivity of the device is found
to be 5.52, 2.89, and 2.54 for 1, 2, and 3 based SBDs, respectively. The enhancement of conductivity
under photoilluminated conditions depends on π-electron donor
capacity of Schiff base ligands and the length of pseudohalide linkers
of 1–3. Again, depending on the binding
fashion of the coordinating ligands, three CPs (1–3) exhibit different selectivity toward nitroaromatic sensing.
In 2,4,6-trinitrophenol (TNP) sensing, CPs follow the order 3 > 2 > 1. CP 3 has
the highest quenching constant among the other two CPs along with
a prominent selectivity and lowest detection limit in response to
TNP.
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