Rishukumar Panday

Potassium dihydrogen phosphate is well‐known to exhibit ferroelectricity, while ammonium dihydrogen phosphate is an antiferroelectric material, with both of them exhibiting a phase transition to paraelectric phase below room temperature. In this work, we report the synthesis and room‐temperature ferroelectric behavior of an aminophosphonium dihydrogen phosphate of formula, [{P(NHPh) ₄ (H ₂ PO ₄ )·(CH ₃ OH) _0.5 ] ( TAPDP·(CH ₃ OH) _0.5 ) that exhibits a three‐dimensional pillared‐layered hydrogen bonding network. (TAPDP·(CH ₃ OH) _0.5 crystallizes in the polar monoclinic P 2 ₁ space group, and its non‐centrosymmetric structure was confirmed by second‐harmonic generation (SHG) measurements. The ferroelectric behavior was further verified through polarization–electric field ( P–E ) loop measurements, with a saturation polarization of 21.40 µC cm ⁻² . Structural analysis combined with preliminary density functional theory calculations indicates a ferrielectric‐type ordering in which the adjacent layers exhibit different polarization directions but with unequal dipole moments. Furthermore, the electromechanical energy‐harvesting properties of TAPDP·(CH ₃ OH) ₀ . ₅ were explored in its composites with the polydimethylsiloxane (PDMS) polymer. The 10 wt% TAPDP·(CH ₃ OH) ₀ . ₅ – PDMS device exhibited a maximum peak‐to‐peak open‐circuit voltage (𝑉 _oc ) of 10.69 ± 0.04 V and the output work efficiency parameter (OWE) of 9.63%. Owing to the superior signal sensitivity of this device, a contact‐type sensor was developed to measure a motor's revolutions per minute (RPM) at both low and high speeds.

Potassium dihydrogen phosphate is well‐known to exhibit ferroelectricity, while ammonium dihydrogen phosphate is an antiferroelectric material, with both of them exhibiting a phase transition to paraelectric phase below room temperature. In this work, we report the synthesis and room‐temperature ferroelectric behavior of an aminophosphonium dihydrogen phosphate of formula, [{P(NHPh) ₄ (H ₂ PO ₄ )·(CH ₃ OH) _0.5 ] ( TAPDP·(CH ₃ OH) _0.5 ) that exhibits a three‐dimensional pillared‐layered hydrogen bonding network. (TAPDP·(CH ₃ OH) _0.5 crystallizes in the polar monoclinic P 2 ₁ space group, and its non‐centrosymmetric structure was confirmed by second‐harmonic generation (SHG) measurements. The ferroelectric behavior was further verified through polarization–electric field ( P–E ) loop measurements, with a saturation polarization of 21.40 µC cm ⁻² . Structural analysis combined with preliminary density functional theory calculations indicates a ferrielectric‐type ordering in which the adjacent layers exhibit different polarization directions but with unequal dipole moments. Furthermore, the electromechanical energy‐harvesting properties of TAPDP·(CH ₃ OH) ₀ . ₅ were explored in its composites with the polydimethylsiloxane (PDMS) polymer. The 10 wt% TAPDP·(CH ₃ OH) ₀ . ₅ – PDMS device exhibited a maximum peak‐to‐peak open‐circuit voltage (𝑉 _oc ) of 10.69 ± 0.04 V and the output work efficiency parameter (OWE) of 9.63%. Owing to the superior signal sensitivity of this device, a contact‐type sensor was developed to measure a motor's revolutions per minute (RPM) at both low and high speeds.

Herein, we report a MeCAAO-stabilized vinyl(silyl)disilene (3) that is stable below 263 K and reacts with BrSi(TMS) ₃ at room temperature to afford the reactivity product 4.

The catecholase-like activity of a mononuclear Cu( ii ) complex, CuCIP, was investigated in aqueous medium using di- tert -butyl-catechol (DTBC) as a substrate, and the mechanism was established by UV-visible spectroscopy, EPR, and cyclic voltammetry.

Metal‐oxide‐based resistive switching (RS) memristors have been extensively investigated, but their practical application is often hindered by complex fabrication processes and high‐power consumption. Metal halide perovskites have emerged as promising alternatives due to their low‐cost fabrication, high defect tolerance, and large I–V hysteresis. Their intrinsic ion migration makes them suitable for resistive switching and artificial synaptic devices. In particular, low‐dimensional hybrid‐halide perovskites (LHPs) have attracted considerable attention because their electronic properties can be tuned by engineering the organic spacer cations. Compared with their three‐dimensional counterparts, they offer improved stability and design flexibility. Moreover, ferroelectric LHPs provide intrinsic nonvolatility beneficial for neuromorphic computing applications. In this perspective, we examine the molecular engineering, synthetic strategies, and operating mechanisms of memristors based on LHPs and their applications in neuromorphic computing. We comparatively analyze the ferroelectric and nonferroelectric variants, highlighting the superior stability and nonvolatility of ferroelectric types versus the faster switching and simpler fabrication of nonferroelectric ones. We provide a systematic four‐stage experimental protocol for unambiguously identifying ferroelectric RS (FeRS) in LHPs, benchmarking key performance parameters and variability challenges for device engineering. We finally conclude with a forward‐looking outlook on materials design, multimodal stimulus response, multiterminal architectures, and hardware security applications.

We present the design, synthesis, and photophysical characterization of a new class of chiral N-heterocyclic carbene (NHC)-copper(I)-amide (CMA) complexes with enantiomerically pure phenylethylamine motifs within the amide framework. These chiral CMA complexes represent a new class of mononuclear molecular Cu(I) complexes exhibiting pronounced chiral nonlinear optical (NLO) activity, which are actively being researched for advanced optoelectronic applications such as advanced photonics, biosensing, and security. The intrinsic molecular chirality and noncentrosymmetric crystal packing collectively enable strong second-harmonic generation (SHG) responses in the presence of circularly polarized (CP) light. Notably, these complexes display impressive SHG circular dichroism factors (g_SHG-CD) as high as ±0.40 at 1000 nm, equaling or surpassing state-of-the-art chiral perovskites in this domain. Beyond their exceptional NLO response, the complexes exhibit dual emissive behavior, originating from both singlet and triplet excited states, with absolute quantum yields reaching 30%, and validated by TD-DFT calculations. The air-sensitive phosphorescence (∼550 nm) efficiently generates singlet oxygen (¹O₂), confirmed by PPh₃ photooxidation and TEMPO radical generation. Remarkably, the emission can be reversibly switched between pure singlet and mixed singlet-triplet states by external modulation of O₂, maintaining photostability over multiple oxic-anoxic cycles up to 5 days. These findings establish chiral CMA complexes as a new class of NHC-ligated molecular Cu(I) systems to display circularly polarized NLO activity with reversible photoluminescent switching, opening new avenues for exploring main-group organometallic compounds in next-generation polarization-sensitive photonic devices.

Herein, we report NHSi–Cu( i )-mesityl-catalyzed regioselective protoboration of terminal alkynes under mild conditions, featuring broad functional-group tolerance and gram-scale applicability.