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.
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