8 research outputs found
Multifunctional behavior of bis-acylhydrazone: Real-time detection of moisture in organic solvents, halochromism and aggregation induced emission
No full textA versatile novel indenopyrazine/indenoquinoxaline appended acylhydrazones (1 and 2) have been designed and synthesized successfully. Compounds 1 and 2 are designed such that, it comprises of acylhydrazone, which is responsible for moisture detection via deprotonation of the original molecule, pyrazine, pyridine and hydrazone unit which is responsible for halochromism via protonation and deprotonation, further the integrated twisted molecular structure results in the aggregation-induced emission features. Successive treatment of Fˉ and moisture to compound 1 and 2 produce reversible colorimetric responses that are easily visualized by the naked eye. Further, the corresponding mechanism was effectively confirmed by 1H NMR spectral analysis. The inherent halochromic features of appended unique pyrazine and pyridine core in compounds 1 and 2 were studied by the sequential addition of trifluoroacetic acid (TFA) and triethylamine (TEA) which is authenticated by reversible colorimetric changes as well as absorption spectral studies. Compound 1 adopts a twisted scissor-like structure and due to multiple weak interactions results in an interesting supramolecular network. Furthermore, both compound 1 and 2 exhibits the aggregation-induced emission features in DMF/water mixture, which was expansively confirmed through DLS particle analysis and TEM images. The integration of three distinct features into a single molecule are scarce
dAJC: A 2.02mW 50Mbps Direct Analog to MJPEG Converter for Video Sensor Node using Low-Noise Switched Capacitor MAC-Quantizer with Auto-Calibration and Sparsity-Aware ADC
No full textWith the advancement in the field of the Internet of Things(IoT) and Internet of Bodies(IoB), video camera applications using Video Sensor Nodes(VSNs) have gained importance in the field of autonomous driving, health monitoring, robot control, and security camera applications. However, these applications typically involve high data rates due to the transmission of high-resolution video signals, resulting from high data volume generated from the analog-to-digital converters (ADCs). This significant data deluge poses processing and storage overheads, exacerbating the problem. To address this challenge, we propose a low-power solution aimed at reducing the power consumption in Video Sensor Nodes (VSNs) by shifting the computation from the digital domain to the inherently energy-efficient analog domain. Unlike standard architectures where computation and processing are typically performed in digital signal processing (DSP) blocks after the ADCs, our approach eliminates the need for such blocks. Instead, we leverage a switched capacitor-based computation unit in the analog domain, resulting in a reduction in power consumption. We achieve a reduction in power consumption compared to digital implementations. Furthermore, we employ a sparsity-aware ADC, which is enabled only for significant compressed samples that contribute to a small fraction () of the total captured analog samples, we achieve a lower ADC conversion energy without any considerable degradation, contributing to the overall energy savings in the system.15 pages, 25 Figures, First publication: Custom Integrated Circuits Conference 2023, 6 author
D–A–D Structured Bis-acylhydrazone Exhibiting Aggregation-Induced Emission, Mechanochromic Luminescence, and Al(III) Detection
No full textA readily
accessible D–A–D triad molecule 1 was synthesized
through acylhydrazone bond formation using carefully
chosen building blocks. The molecule 1 exhibits emission
through charge-coupled proton transfer and enhanced emission induced
through aggregation and mechanochromic luminescence. Further, it detects
Al(III) selectively among other cations in an efficient manner
D–A–D Structured Bis-acylhydrazone Exhibiting Aggregation-Induced Emission, Mechanochromic Luminescence, and Al(III) Detection
No full textA readily
accessible D–A–D triad molecule 1 was synthesized
through acylhydrazone bond formation using carefully
chosen building blocks. The molecule 1 exhibits emission
through charge-coupled proton transfer and enhanced emission induced
through aggregation and mechanochromic luminescence. Further, it detects
Al(III) selectively among other cations in an efficient manner
A 65nm Resonant Electro-Quasistatic 5-240uW Human Whole-Body Powering and 2.19uW Communication SoC with Automatic Maximum Resonant Power Tracking
No full textBinuclear Double-Stranded Helicates and Their Catalytic Applications in Desymmetrization of Mesodiols
No full textThe
ligand L1 of 4-methyl-2,6-diformylphenol and L2 of 4-tert-butyl-2,6-diformylphenol are synthesized
through Schiff base condensation with rac-, (R)-(+), or (S)-(−)-1,1′-binaphthyl-2,2′-diamine
(BNDA). As a result, the racemic L1rac, L2rac, and enantiopure L1RR, L1SS, L2RR, and L2SS ligands are obtained incorporating Cu(II) and
Zn(II) salts by a simple one-pot metal template method. The series
of dinuclear complexes of [M2LX2] (here, M =
Cu2+, Zn2+; X = acetate ion, chloride ion; L
= L1RR, L1SS, L1rac, L2RR, L2SS, L2rac) formulas are obtained in common. Among
them, the single crystal X-ray structures for [Zn2L1rac(OAc)2] and [Zn2L1SSCl2] complexes are obtained. The detailed
crystal structure and the chiroptical studies performed on these complexes
dictates a self-sorting behavior in their self-assembly process and
illustrate a chirality transfer from the ligand to the metal center
on the complexes. The enantiopure dinuclear complexes [M2LRRX2] and [M2LSSX2] generate enantiopure ΛΛ and ΔΔ isomers,
respectively, but the racemic complexes produce only homochiral ΛΛ
and ΔΔ assemblies. The detailed studies based on UFLC
(Ultra Fast Liquid Chromatography), CD, and single crystal X-ray structure
together show the absence of heterochiral ΛΔ mesocate.
All these complexes are adapted as catalysts for desymmetrization
of various mesodiols, and the enantiopure complexes are found to give
efficient enantioselectivity in desymmetrization of mesodiols with
benzoyl chloride to monobenzoylated ester providing 98% yield and
92% ee
Enantiomeric Resolution of Asymmetric-Carbon-Free Binuclear Double-Stranded Cobalt(III) Helicates and Their Application as Catalysts in Asymmetric Reactions
No full textA series of double-stranded binuclear
helicates [Co2(H1)2]4+, [Co2(H2)2]4+, and [Co2(H3)2]4+, derived from monodeprotonated bis-pyridyl hydrazine-based ligands
of H21, H22, and H23 with one, two, and three −CH2 spacers, were obtained. These asymmetric-carbon-free racemic helicates
were separated into their ΔΔ and ΛΛ enantiomers.
The resolved helicates were examined for the first time as enantioselective
catalysts in asymmetric benzoylation and nitroaldol reactions
