scholarly journals Solid-State Nanochannel with Multiple Signal Outputs for Furin Detection Based on the Biocompatible Condensation Reaction

2021 ◽  
Author(s):  
Jing-Jing Hu ◽  
Wenlian Jiang ◽  
Qing Chen ◽  
Rui Liu ◽  
Xiaoding Lou ◽  
...  
Keyword(s):  
Solid State ◽  
Condensation Reaction ◽  
Multiple Signal

Squaraine chemistry. A new approach to symmetrical and unsymmetrical photoconductive squaraines. Characterization and solid state properties of these materials

1993 ◽  
Vol 71 (4) ◽  
pp. 494-505 ◽  
Author(s):  
Kock-Yee Law ◽  
F. Court Bailey
Keyword(s):  
Solid State ◽  
Condensation Reaction ◽  
Cost Effective ◽  
Squaric Acid ◽  
Reductive Alkylation ◽  
Reaction Sequence ◽  
New Approach ◽  
Effective Synthesis ◽  
Better Than

A new approach to 1-(p-dimethylaminophenyl)-2-hydroxycyclobutene-3,4-dione (4), a precursor for the synthesis of symmetrical and unsymmetrical photoconductive squaraines, is described. In situ generation of p-nitrophenyl ketene, by the reaction of p-nitrophenylacetyl chloride and triethylamine in the presence of tetraethoxyethylene in anhydrous ether, results in a (2 + 2) cycloaddition between the ketene and the electron-rich olefin. The cycloadduct generated, 6, was hydrolyzed to give 1-(p-nitrophenyl)-2-hydroxycyclobutene-3,4-dione (5) in 51% yield. Reductive alkylation of 5 by hydrogen in the presence of formaldehyde in DMF at 50–60 °C affords 4 in 81% yield. The overall yield of 4 is 41% from tetraethoxyethylene and is significantly better than other preparative procedures of 4 based on a partial Friedel–Crafts reaction or an arylation reaction of a squaric acid derivative with an aniline, where yields ranging from 8.5% to 24% were reported. Condensations of 4 with 2 equivalents of N,N-dimethylaniline and its derivatives in refluxing 2-propanol in the presence of 6 equivalents of tributyl orthoformate yield symmetrical squaraine 1a and unsymmetrical squaraines 1b–1e. The synthesis is accomplished by a (2 + 2) cycloaddition – reductive alkylation – condensation reaction sequence and represents a new, cost-effective synthesis for photoconductive squaraines where the expensive squaric acid reactant is bypassed. The spectroscopic and the solid state properties of 1a–1e have been studied. Results show that the properties exhibited by 1a–1e are essentially identical to those exhibited by other photoconductive, symmetrical squaraines that are synthesized by other known processes. From the resemblance in solid state properties, 1a–1e are expected to be photoconductive. This has indeed been observed in preliminary experiments.

Synthese, Struktur und Reaktivität von Aminomethylpyridin- zinkdihalogeniden / Synthesis, Structure and Reactivity of Aminomethylpyridine Zinc Dihalides

2000 ◽  
Vol 55 (1) ◽  
pp. 51-59 ◽  
Author(s):  
Matthias Westerhausen ◽  
Tobias Bollwein ◽  
Kurt Polborn
Keyword(s):  
Solid State ◽  
Linear Relationship ◽  
Coordination Sphere ◽  
Condensation Reaction ◽  
Quantitative Yield ◽  
Zinc Atom ◽  
Trigonal Bipyramidal ◽  
Distorted Trigonal Bipyramidal Coordination ◽  
Small X ◽  
Distorted Trigonal Bipyramidal

Zinc dichloride reacts with aminomethylpyridine (AMP) to the corresponding 1:1 adduct 1, whereas ZnBr2 forms an ionic 1:2 complex of the type [(AMP)2ZnBr]+ Br- 2, which loses one neutral coligand upon heating in Me-C (O)OEt to yield nearly insoluble (AM P)ZnBr2 3. The condensation reaction of these compounds with acetone yields propylideneaminomethylpyridine zinc dichloride (4) and dibromide (5), respectively. The reaction of ZnI2 with AMP and acetone gives propylideneaminomethylpyridine zinc dichloride (6) in quantitative yield. The structures of 3, 4, and 6 confirm the linear relationship between the Zn-N distance and the X-Zn-X angle in compounds of the type (L2)ZnX2 with L2 being a bidentate amino base, whereas short Zn-N bonds enforce small X-Zn-X angles. Compound 2 consists of separated ions in the solid state with a five coordinate zinc atom in a distorted trigonal bipyramidal coordination sphere

Solid-state structure and condensation reaction of (triphenylmethyl)silanetriol

2005 ◽  
Vol 690 (5) ◽  
pp. 1372-1378 ◽  
Author(s):  
Jeong Hyun Kim ◽  
Joon Soo Han ◽  
Myong Euy Lee ◽  
Do Hyun Moon ◽  
Myoung Soo Lah ◽  
...  
Keyword(s):  
Solid State ◽  
Condensation Reaction ◽  
State Structure ◽  
Solid State Structure

Aggregation-Induced Emission Properties of Triphenylamine Chalcone Compounds

2021 ◽  
Author(s):  
ying-peng zhang ◽  
Qi Teng ◽  
Yun-Shang Yang ◽  
Jing-Qi Cao ◽  
Ji-Jun Xue
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
Fluorescence Intensity ◽  
Condensation Reaction ◽  
Stokes Shift ◽  
Fluorescence Emission ◽  
Linear Change ◽  
Aggregation Induced Emission ◽  
Chalcone Derivatives ◽  
Thermal Stability Of

Abstract Two triphenylamine chalcone derivatives 1 and 2 were synthesized through the Vilsmeier-Haack reaction and Claisen-Schmidt condensation reaction. Through ultraviolet absorption spectroscopy and fluorescence emission spectroscopy experiments, it was confirmed that these two compounds exhibited good aggregation-induced emission (AIE) behavior in ethanol/water mixtures. The solvent effect test showed with the increase of the orientation polarizability of the solvent, the Stokes shift in the solvent of compound 1 and compound 2 shows a linear change trend. Through solid state fluorescence test and universal density function theory (DFT), the existence of π-π stacking interaction in the solid state of the compound has been studied, resulting in weak fluorescence emission. pH has no effect on the fluorescence intensity of the aggregate state of excited state intramolecular proton transfer (ESIPT) molecules in an acidic environment, but greatly weakens its fluorescence intensity in an alkaline environment. Cyclic voltammetry (CV) test shows that compound 1 was more prone to oxidation reaction than compound 2. The results of thermal stability test show that the thermal stability of compound 1 was better than that of compound 2, indicating that triphenylamine chalcone derivatives can improve the thermal stability of compounds by increasing the number of branches.

Synthesis and Solid-State Structure of the Unsymmetrical Squaraine Dye 2-[4-(Dibutylamino)-2-hydroxyphenyl]-4-[4-(dibutylamino)phenyl]-cyclobutenebis(ylium)-1,3-diolate

1996 ◽  
Vol 49 (12) ◽  
pp. 1339 ◽  
Author(s):  
DG Hamilton ◽  
DE Lynch ◽  
G Smith
Keyword(s):  
Solid State ◽  
Hydroxy Group ◽  
Phenyl Ring ◽  
Condensation Reaction ◽  
State Structure ◽  
Solid State Structure ◽  
Squaraine Dye

The synthesis of an unsymmetrical squaraine dye, 2-[4-( dibutylamino )-2-hydroxyphenyl]-4-[4-( dibutylamino )phenyl] cyclobutenebis ( ylium )-1,3-diolate, has been achieved via a cross condensation reaction. In the solid state the compound is isomorphous with the known symmetrical dye bis [4-( dibutylamino )phenyl] squaraine. The single hydroxy group is found to be disordered equally over the centrosymmetrically trans-related ortho and ortho' phenyl ring sites.

Isolation and Structure of a Hydrogen-bonded 2,2′:6′,2′′-Terpyridin-4′-one Acetic Acid Adduct

2014 ◽  
Vol 67 (4) ◽  
pp. 651 ◽  
Author(s):  
Pas Florio ◽  
Campbell J. Coghlan ◽  
Chih-Pei Lin ◽  
Kei Saito ◽  
Eva M. Campi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Acetic Acid ◽  
Solid State ◽  
Ammonium Acetate ◽  
Condensation Reaction ◽  
Acetate Salt ◽  
Pyridine Nitrogen ◽  
Acid Adduct ◽  
Hydrogen Bonded

Herein, we report the crystal structure of a key intermediate in the synthesis of 4′-substituted-terpyridines. Our findings confirm that the terpyridin-4′-one intermediate as generated from the condensation reaction of the corresponding triketone precursor with ammonium acetate is isolated as a hydrogen-bonded adduct with acetic acid, and not, as previously reported, as the acetate salt of a protonated pyridine nitrogen. This finding provides a rationale for the behaviour and structure of substituted terpyridin-4′-ones and pyridones in both the solid state and in solution.

Some Novel Amino Acid-Schiff Bases and their Complexes Synthesis, Characterization, Solid State Conductivity Behaviors and Potentiometric Studies

2004 ◽  
Vol 59 (6) ◽  
pp. 692-698 ◽  
Author(s):  
Nurşen Sarı ◽  
Perihan Gürkan
Keyword(s):  
Amino Acid ◽  
Ionic Strength ◽  
Solid State ◽  
Aqueous Medium ◽  
Spectral Data ◽  
Schiff Bases ◽  
Stability Constants ◽  
Room Temperature ◽  
Condensation Reaction ◽  
Potentiometric Studies

Three new Schiff bases derived from the condensation reaction of thiophene-2-carbaldehyde and DL-alanine, DL-valine and DL-phenylalanine have been synthesized and their Co(II), Ni(II) and Cu(II) complexes have been prepared. The Schiff bases and the complexes have been characterized by their analytical and spectral data. The protonation constants of the Schiff bases and stability constants of the complexes have been determined potentiometrically in aqueous medium at 25 °C and 0.1 M KCl ionic strength. Solid state conductivities of the synthesized substances were using the four-probe technique on a compressed pellet at room temperature.

scholarly journals Synthesis and anion binding properties of phthalimide-containing corona[6]arenes

2019 ◽  
Vol 15 ◽  
pp. 1976-1983 ◽  
Author(s):  
Meng-Di Gu ◽  
Yao Lu ◽  
Mei-Xiang Wang
Keyword(s):  
Solid State ◽  
Gas Phase ◽  
Noncovalent Interactions ◽  
Condensation Reaction ◽  
Anion Binding ◽  
The Novel ◽  
Binding Properties ◽  
One Pot ◽  
Mild Conditions ◽  
Complex Anions

Functionalized O6-corona[3]arene[3]tetrazines were synthesized efficiently and conveniently by means of a macrocyclic condensation reaction between N-functionalized 3,6-dihydroxyphthalimides and 3,6-dichlorotetrazine under mild conditions in a one-pot reaction manner. The novel macrocycles exist as a mixture of rapidly interconvertible conformers in solution while in the solid state they adopt the conformation in which three phthalimide units are cis,trans-orientated. Acting as electron-deficient macrocyclic hosts, the synthesized O6-corona[3]arene[3]tetrazines self-regulated conformational structures to complex anions in the gas phase and in the solid state owing to the anion–π noncovalent interactions between anions and the tetrazine rings.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

The Collagenic Molecular Structural Unit of Solid State Complexes

1971 ◽  
Vol 29 ◽  
pp. 478-479
Author(s):  
Kenneth M. Richter ◽  
John A. Schilling
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Structural Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naoh Treatment

The structural unit of solid state collagen complexes has been reported by Porter and Vanamee via EM and by Cowan, North and Randall via x-ray diffraction to be an ellipsoidal unit of 210-270 A. length by 50-100 A. diameter. It subsequently was independently demonstrated by us in dog tendon, dermis, and induced complexes. Its detailed morphologic, dimensional and molecular weight (MW) aspects have now been determined. It is pear-shaped in long profile with m diameters of 57 and 108 A. and m length of 263 A. (Fig. 1, tendon, KMnO4 fixation, Na-tungstate; Fig. 2a, schematic of unit in long, C, and x-sectional profiles of its thin, xB, and bulbous, xA portions; Fig. 2b, tendon essentially unmodified by ether and 0.4 N NaOH treatment, Na-tungstate). The unit consists of a uniquely coild cable, c, of ṁ 22.9 A. diameter and length of 2580-3316 A. The cable consists of three 2nd-strands, s, each of m 10.6 A.

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