scholarly journals Solvent Controlled Colorimetric And Fluorometric Detection of Fe2+ and Cu2+ Ions By Naphthaldimine-Glucofuranose Conjugate

2021 ◽  
Author(s):  
Mini Loya ◽  
Bholanath Dolai ◽  
Ananta Kumar Atta
Keyword(s):  
High Resolution Mass Spectrometry ◽  
Binding Mode ◽  
Fluorometric Detection ◽  
Nmr Titration ◽  
Fluorescence Studies ◽  
Color Changes ◽  
H Nmr ◽  
Absorption And Emission Spectroscopy ◽  
Absorbance Data ◽  
Metal Ligand

Abstract The sensing properties of naphthaldimine-glucofuranose conjugates 1 and 2 towards metal ions were investigated by 1H NMR titration, FTIR, absorbance, and fluorescence spectroscopic methods. The absorbance and fluorescence studies indicated that compound 1 formed coordination with Fe2+ and Cu2+ ions in DMSO through color changes yellow to brown and colorless, respectively. The Job's plots using absorbance data showed metal-ligand binding ratio is 1:1 for both cases. The formation of 1-Fe2+ and 1-Cu2+ complexes have been analyzed by absorption and emission spectroscopy, high-resolution mass spectrometry (HRMS) data, FTIR, 1H NMR titration experiment, and DFT calculations. The detection limits of naphthaldimine sugar conjugate 1 towards Fe2+/Cu2+ were calculated from UV-vis and fluorescence data according to the standard method. The sugar-naphthaldimine conjugate 2 has been used to establish the binding mode of 1 with Fe2+ or Cu2+ ions in DMSO.

scholarly journals Synthesis, Characterization, and Electrochemical Behaviour of Cobalt(II) and Nickel(II) Complexes with N2O2 Chelating Ligand 4,4′-(Biphenyl-4,4′-diyldinitrilo)dipentan-2-one

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Lakhdar Sibous ◽  
Embarek Bentouhami ◽  
Mustayeen Ahmed Khan
Keyword(s):  
Schiff Base ◽  
Mass Spectroscopy ◽  
Elemental Analysis ◽  
Electrochemical Behaviour ◽  
Absolute Ethanol ◽  
Molar Ratio ◽  
H Nmr ◽  
Chelating Ligand ◽  
Metal Ligand

4,4′-Diaminobiphenyl reacts with 2,4-pentanedione in absolute ethanol in a molar ratio 1 : 2 to form mainly the product of [1 + 2] condensation, 4,4′-(biphenyl-4,4′-diyldinitrilo)dipentan-2-one (H2L). The Schiff base was used as tetradentate chelating ligand to coordinate CoII and NiII chlorides leading to complexes where the ratio of metal ligand was found to be 2 : 1 or 2 : 2. All the synthesized products were characterized by elemental analysis, infrared, electronic, and mass spectroscopy, 1H NMR, and DSC. The electrochemical behaviour of the ligand and its complexes in DMF is also investigated.

Synthesis and characterization of meso-to-meso directly linked porphyrin-diazaporphyrin triads

2018 ◽  
Vol 22 (09n10) ◽  
pp. 814-820
Author(s):  
Yingying Jia ◽  
Ling Xu ◽  
Bangshao Yin ◽  
Mingbo Zhou ◽  
Jianxin Song
Keyword(s):  
Nickel Complex ◽  
High Resolution Mass Spectrometry ◽  
Dihedral Angles ◽  
X Ray Diffraction ◽  
Extinction Coefficients ◽  
X Ray ◽  
H Nmr ◽  
First Time ◽  
Molar Extinction Coefficients

Beginning with 5,10,15-triarylporphyrin-nickel complex, five meso-to-meso directly linked porphyrin-diazaporphyrin triads were successfully prepared for the first time through a series of reactions including formylation via Vilsmeier–Haack reaction, condensation with pyrrole, bromination with [Formula: see text]-Bromosuccinimide (NBS), oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), metal-templated cyclization of dibromodipyrrin-metal complexes with NaN[Formula: see text] and demetalization. All these triads were comprehensively characterized by [Formula: see text]H NMR, high-resolution mass spectrometry and UV-vis absorption. In addition, the structure of compound 6Ni was unambiguously determined by X-ray diffraction analysis, which showed that the two dihedral angles are both 86.65 (4)[Formula: see text] between each mean plane of porphyrin and that of central diazaporphyrin The UV-vis absorption spectra disclosed that the longest wavelengths of Soret bands and Q bands for these triads were observed at 429 and 642 nm, respectively. In contrast to diazaporphyrin-porphyrin dyads, diazaporphyrin dimers and diazaporphyrin monomers reported previously the molar extinction coefficients, particularly for triad 8Ni are much higher.

scholarly journals Design and synthesis of C-ring quinoxaline-substituted sinomenine 1,2,3-triazole derivatives via click reactions

2020 ◽  
Vol 44 (11-12) ◽  
pp. 699-704
Author(s):  
Tong Lu ◽  
Ling Dong ◽  
Hongmei Pan ◽  
Xuedan Wu ◽  
Xia Chen ◽  
...  
Keyword(s):  
High Resolution Mass Spectrometry ◽  
Infrared Spectrometry ◽  
Fourier Transform Infrared Spectrometry ◽  
Click Reactions ◽  
Triazole Derivatives ◽  
Design And Synthesis ◽  
H Nmr ◽  
Benzyl Chlorides ◽  
Heterocyclic Derivatives ◽  
C Nmr

The synthesis of C-ring quinoxaline-substituted sinomenine 1,2,3-triazole derivatives at the 4-OH via click reactions is accomplished, and a total of 16 novel sinomenine double N-heterocyclic derivatives are obtained in 74%–95% yields. The C-ring is first transformed into a 1,2-diketone structure under the action of hydrochloric acid, and then reacted with o-phenylenediamine to obtain a C-ring quinoxaline-substituted structure. The 4-OH of sinomenine reacts with chloropropyne to give an alkynyl sinomenine, and then reacts with sodium azide and various benzyl chlorides to give the target compounds. All the synthesized derivatives are characterized by Fourier-transform infrared spectrometry, high resolution mass spectrometry, 1H NMR, and 13C NMR spectroscopy.

scholarly journals Chloro- and BF2bdk-substituted dithienylethene: Synthesis, photophysical properties, and optical switching behavior

2020 ◽  
pp. 174751982095141
Author(s):  
Zhiqiang Lu ◽  
Wenbo Yang ◽  
Yanhui Bai ◽  
Mo Wang ◽  
Zixu Li ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Optical Switching ◽  
High Resolution Mass Spectrometry ◽  
Photophysical Properties ◽  
Red Light ◽  
Switching Behavior ◽  
Polar Solvents ◽  
H Nmr ◽  
Resolution Mass ◽  
C Nmr

A novel chloro- and BF2bdk-substituted dithienylethene derivative, in which a chlorine atom and a difluoroboron β-diketonate (BF2bdk) group are appended at the termini of the dithienylethene core, is developed. The structure was confirmed by 1H NMR, 13C NMR, and high-resolution mass spectrometry (electrospray ionization). It displayed solvent-dependent photophysical properties, and blue/red light-triggered optical switching behavior in nonpolar or less polar solvents.

scholarly journals Experimental and Theoretical Studies of Novel Azo Benzene Functionalized Conjugated Polymers: In-vitro Antileishmanial Activity and Bioimaging

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Neetika Singh ◽  
Mohd. Arish ◽  
Prabhat Kumar ◽  
Abdur Rub ◽  
Ufana Riaz
Keyword(s):  
Atomic Orbital ◽  
Uv Spectra ◽  
Basis Set ◽  
Fluorescence Studies ◽  
H Nmr ◽  
Transmission Electron ◽  
B3lyp Method ◽  
Vis Spectroscopy ◽  
Experimental Findings

AbstractTo study the effect of insertion of azobenzene moiety on the spectral, morphological and fluorescence properties of conventional conducting polymers, the present work reports ultrasound-assisted polymerization of azobenzene with aniline, 1-naphthylamine, luminol and o-phenylenediamine. The chemical structure and polymerization was established via Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (1H-NMR) spectroscopy, while the electronic properties were explored via ultraviolet-visible (UV-vis) spectroscopy. Theoretical IR and UV spectra were computed using DFT/B3LYP method with 6–311G basis set while theoretical 1H-NMR spectra was obtained by gauge independent atomic orbital (GIAO) method. The theoretically computed spectra were found to be in close agreement with the experimental findings confirming the chemical as well as electronic structure of the synthesized polymers. Morphology was investigated by X-ray diffraction and transmission electron microscopy studies. Fluorescence studies revealed emission ranging between 530–570 nm. The polymers also revealed high singlet oxygen (1O2) generation characteristics. In-vitro antileishmanial efficacy as well as live cell imaging investigations reflected the potential application of these polymers in the treatment of leishmaniasis and its diagnosis.

Factors governing when a metal-bound water is deprotonated in proteins

2018 ◽  
Vol 20 (47) ◽  
pp. 29625-29636 ◽  
Author(s):  
Cédric Grauffel ◽  
Carmay Lim
Keyword(s):  
Metal Binding ◽  
Bound Water ◽  
Binding Mode ◽  
Type Number ◽  
Protein Environment ◽  
Metal Ligand ◽  
Ligand Bond

We evaluate the extent to which the pKw depends on the type, number, and metal-binding mode of the first-shell ligands, the metal–ligand bond distances, first-shell⋯second-shell H-bonding interactions, and the protein environment.

A highly selective fluorescent chemosensor for Al(III) ions based on 2-hydroxy-1-naphthaldehyde derivative

2019 ◽  
Vol 97 (5) ◽  
pp. 387-391 ◽  
Author(s):  
Jiayi Sun ◽  
Min Zhang ◽  
Changyan Sun
Keyword(s):  
Mass Spectrometry ◽  
Schiff Base ◽  
Excited State ◽  
Intramolecular Proton Transfer ◽  
Fluorescent Chemosensor ◽  
Hydroxyl Groups ◽  
Ionization Mass ◽  
Nmr Titration ◽  
H Nmr ◽  
Base Derivative

This manuscript reports the synthesis and fluorescent chemosensor property of a Schiff base derivative, 4-[(2-hydroxy-1-naphthyl) methylideneamino]benzoic acid (H2L). The fluorescence spectrum shows that H2L exhibits a highly selective and sensitive recognition for Al3+ ions in N,N′-dimethylformamide/water (DMF/H2O, 1/1, v/v). The fluorescence titration experiments and electrospray ionization mass spectrometry (ESI–MS) show that H2L and Al3+ ions form a 1:1 complex. 1H NMR titration results show that H2L coordinates to Al3+ ions with carboxylate, hydroxyl groups, and imine groups and the probable sensing mechanism may be the excited-state intramolecular proton transfer (ESIPT) process.

scholarly journals DNA Interaction Studies of a New Platinum(II) Complex Containing Different Aromatic Dinitrogen Ligands

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Nahid Shahabadi ◽  
Somaye Mohammadi ◽  
Robabeh Alizadeh
Keyword(s):  
Absorption Band ◽  
Bathochromic Shift ◽  
Binding Mode ◽  
Dna Interaction ◽  
Quenching Mechanism ◽  
Binding Interaction ◽  
Fluorescence Studies ◽  
Cyclic Voltametry ◽  
Calf Thymus ◽  
Ct Dna

A new mononuclear Pt(II) complex, [Pt(DMP)(DIP)]Cl2.H2O, in which DMP is 4,4-dimethyl-2,2-bipyridine and DIP is 4,7-diphenyl-1,10-phenantroline, has been synthesized and characterized by physicochemical and spectroscopic methods. The binding interaction of this complex with calf thymus DNA (CT-DNA) was investigated using fluorimetry, spectrophotometry, circular dichroism, viscosimetry and cyclic voltametry (CV). UV-VIS spectrum showed 4 nm bathochromic shift of the absorption band at 280 nm along with significant hypochromicity for the absorption band of the complex. The intrnisic binding constant is more in keeping with intercalators and suggests this binding mode. The viscosity measurements showed that the complex-DNA interaction can be hydrophobic and confirm intercalation. Moreover, the complex induced detectable changes in the CD spectrum of CT-DNA. The fluorescence studies revealed that the probable quenching mechanism of fluorescence of the complex by CT-DNA is static quenching. The thermodynamic parameters ( and ) showed that main interaction with hydrogenic forces occurred that is intercalation mode. Also, CV results confirm this mode because, with increasing the CT-DNA concentration, shift to higher potential was observed.

scholarly journals A ferrocene redox-active triazolium macrocycle that binds and senses chloride

2012 ◽  
Vol 8 ◽  
pp. 246-252 ◽  
Author(s):  
Nicholas G White ◽  
Paul D Beer
Keyword(s):  
Solid State ◽  
Good Yield ◽  
Electrochemical Studies ◽  
Nmr Titration ◽  
X Ray ◽  
X Ray Crystallography ◽  
H Nmr ◽  
Redox Active

A ferrocene bis(triazole) macrocycle was synthesised in good yield by the Eglinton coupling of an acyclic bis(alkyne) precursor and characterised in the solid state by X-ray crystallography. Alkylation gives the corresponding triazolium macrocycle, which binds chloride and benzoate strongly in CD3CN solution through favourable charge-assisted C–H···anion interactions, as evidenced by 1H NMR titration experiments. Preliminary electrochemical studies reveal that the redox-active macrocycle is capable of sensing chloride in CH3CN solution.

scholarly journals Intermolecular Interactions between Eosin Y and Caffeine Using 1H-NMR Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Macduff O. Okuom ◽  
Mark V. Wilson ◽  
Abby Jackson ◽  
Andrea E. Holmes
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr Spectroscopy ◽  
Date Rape ◽  
Proton Exchange ◽  
Eosin Y ◽  
Club Drugs ◽  
Hydroxybutyric Acid ◽  
Color Changes ◽  
H Nmr ◽  
Nmr Methods

DETECHIP has been used in testing analytes including caffeine, cocaine, and tetrahydrocannabinol (THC) from marijuana, as well as date rape and club drugs such as flunitrazepam, gamma-hydroxybutyric acid (GHB), and methamphetamine. This study investigates the intermolecular interaction between DETECHIP sensor eosin Y (DC1) and the analyte (caffeine) that is responsible for the fluorescence and color changes observed in the actual array. Using 1H-NMR, 1H-COSY, and 1H-DOSY NMR methods, a proton exchange from C-8 of caffeine to eosin Y is proposed.

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