Dynamic tuning of metal–ligand coordination through water molecules to induce multicolor fluorescence variations for humidity monitoring and anti-counterfeiting applications

2021 ◽  
Author(s):  
Juan Wei ◽  
Yun Ma ◽  
Chenyuan Liu ◽  
Jiangang Li ◽  
Jiandong Shen ◽  
...  
Keyword(s):  
Water Molecules ◽  
Effective Strategy ◽  
Color Changes ◽  
Dynamic Tuning ◽  
Fluorescence Color ◽  
Ligand Coordination ◽  
Multicolor Fluorescence ◽  
Humidity Monitoring ◽  
Metal Ligand

We proposed a simple and effective strategy to construct a luminescent ratiometric RH sensor that can exhibit fluorescence color changes from blue to yellow upon increasing the RH.

scholarly journals Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3598
Author(s):  
Nirmal K. Shee ◽  
Hee-Joon Kim
Keyword(s):  
Aqueous Solution ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Self Assembly ◽  
The Self ◽  
Assembly Process ◽  
Absorption Bands ◽  
Ligand Coordination ◽  
Rhodamine B Dye ◽  
Metal Ligand

A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

Template-free multicomponent coordination-driven self-assembly of Pd(ii)/Pt(ii) molecular cages

2014 ◽  
Vol 50 (18) ◽  
pp. 2239-2248 ◽  
Author(s):  
Sandip Mukherjee ◽  
Partha Sarathi Mukherjee
Keyword(s):  
Self Assembly ◽  
Assembly Process ◽  
Molecular Cages ◽  
Recent Developments ◽  
Ligand Coordination ◽  
Template Free ◽  
Metal Ligand

This article summarizes the recent developments in the construction of multicomponent molecular hollowed-out cages through the metal–ligand coordination-driven self-assembly process, with a focus on the decreasing relevance of the use of templates.

scholarly journals Crystal structure of a nickel compound comprising two nickel(II) complexes with different ligand environments: [Ni(tren)(H2O)2][Ni(H2O)6](SO4)2

2020 ◽  
Vol 76 (3) ◽  
pp. 314-317
Author(s):  
Karilys González Nieves ◽  
Dalice M. Piñero Cruz
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Molar Ratio ◽  
Water Molecules ◽  
Nickel Compound ◽  
Counter Anion ◽  
Cationic Complex ◽  
Coordinated Water ◽  
Co Precipitation ◽  
Metal Ligand

The title compound, diaqua[tris(2-aminoethyl)amine]nickel(II) hexaaquanickel(II) bis(sulfate), [Ni(C6H18N4)(H2O)2][Ni(H2O)6](SO4)2 or [Ni(tren)(H2O)2][Ni(H2O)6](SO4)2, consists of two octahedral nickel complexes within the same unit cell. These metal complexes are formed from the reaction of [Ni(H2O)6](SO4) and the ligand tris(2-aminoethyl)amine (tren). The crystals of the title compound are purple, different from those of the starting complex [Ni(H2O)6](SO4), which are turquoise. The reaction was performed both in a 1:1 and 1:2 metal–ligand molar ratio, always yielding the co-precipitation of the two types of crystals. The asymmetric unit of the title compound, which crystallizes in the space group Pnma, consists of two half NiII complexes and a sulfate counter-anion. The mononuclear cationic complex [Ni(tren)(H2O)2]2+ comprises an Ni ion, the tren ligand and two water molecules, while the mononuclear complex [Ni(H2O)6]2+ consists of another Ni ion surrounded by six coordinated water molecules. The [Ni(tren)(H2O)2] and [Ni(H2O)6] subunits are connected to the SO4 2− counter-anions through hydrogen bonding, thus consolidating the crystal structure.

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 The structural diversity of heterocycle-fused potassium cyclopentadienides

RSC Advances ◽  
2019 ◽  
Vol 9 (50) ◽  
pp. 29195-29204 ◽  
Author(s):  
Ilya E. Nifant'ev ◽  
Alexander A. Vinogradov ◽  
Mikhail E. Minyaev ◽  
Pavel D. Komarov ◽  
Konstantin A. Lyssenko ◽  
...  
Keyword(s):  
Crystal Packing ◽  
Structural Diversity ◽  
Ligand Coordination ◽  
Metal Ligand

Heterocycle-fused cyclopentadienides of potassium demonstrate remarkable diversity in metal–ligand coordination and crystal packing.

Newly Synthesized Branch-type Aromatic Oxadiazole Polymer and Binary Fluorescence Patterning on its Film

2007 ◽  
Vol 19 (5-6) ◽  
pp. 531-540 ◽  
Author(s):  
Moon Soo Choi ◽  
Hyung Jun Kim ◽  
Taek Seung Lee ◽  
Won Seok Lyoo
Keyword(s):  
Coupling Reaction ◽  
Side Reaction ◽  
Hydroxyl Group ◽  
Side Chain ◽  
Aromatic Side Chain ◽  
Suzuki Coupling Reaction ◽  
Color Changes ◽  
Fluorescence Color ◽  
Before And After ◽  
Photochemical Cleavage

Aromatic side-chain oxadiazole polymer linked with 9,9'-dioctylfluorene was successfully synthesized via Suzuki coupling reaction. Hydroxyphenyl group was attached in the 2-position of the oxadiazole unit in the polymer side chain to control the optical properties of the polymer. We confirmed the presence of the t-butoxycarbonyl group on the hydroxyl group using thermogravimetric analysis, which was incorporated to avoid side reaction during polymerization. We also performed the simple and easy fabrication method for the dual fluorescence image using photochemical cleavage of the t-butoxycarbonyl group from the polymer to induce fluorescence color changes before and after UV irradiation.

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