iScience - Article Browse Page

Articles

Ashokkumar

Browse Articles

Showing articles posted by user Ashokkumar (x)

Photoinduced Electron Transfer (PET) Based Zn2+ Fluorescent Probe: Transformation of Turn-On Sensors into Ratiometric Ones with
- Posted by Ashokkumar
- February 11, 2012
- 0 comments
- 0 likes
- 140 views
Ratiometric sensors for the detection of metal ionshave gained increasing attention due to its self-calibrationtendency for the environmental effects. In this context, we havesynthesized and characterized a dual emitting ratiometric Zn2+probe (1) havin...
Highly selective, sensitive and quantitative detection of Hg2+ in aqueous medium under broad pH range
- Posted by Ashokkumar
- February 11, 2012
- 0 comments
- 0 likes
- 156 views
Amidothiourea linked acridinedione derivatives selectively detectHg2+ in unbuffered aqueous solution under broad pH range withboth single- and two-photon excitation. The observed linearfluorescence intensity change allows the quantitative detectionof H...
Head-to-Tail Intermolecular Hydrogen Bonding of OH and NH Groups with Fluoride
- Posted by Ashokkumar
- February 9, 2011
- 0 comments
- 0 likes
- 747 views
To explore the anion-recognition ability of the phenolic hydroxyl group and the amino hydrogen, we synthesized three different acridinedione (ADD) based anion receptors, 1, 2 and 3, having OH, NH, and combination of OH and NH groups, respectively. Abso...
Solvent-Controlled Metal Ion Binding Selectivity and Anion Interaction of the Acridinedione-Based Heteroditopic Host
- Posted by Ashokkumar
- February 9, 2011
- 0 comments
- 0 likes
- 687 views
Acridinedione-based heteroditopic hosts 1a-c, which contain a flexible oxyethylene moiety as a metal ion binding site and amino hydrogen as an anion receptor unit, were synthesized and characterized. Metal ion and anion binding studies were carried out...
Molecular folding induced nanogold aggregation
- Posted by Ashokkumar
- November 20, 2010
- 0 comments
- 0 likes
- 585 views
Bisacridinedione-functionalized gold nanoparticles (bisADD-GNPs) were prepared and characterized. Bis- ADD is a flexible acyclic moiety and a specific Ca2+ sensor. Signaling of the binding events is achieved by the cation-induced folding of the bisADD-...
Triple fluorescence of acridinedione: Locally excited, photoinduced electron transfer promoted charge transfer and anion induced charge transfer states
- Posted by Ashokkumar
- November 20, 2010
- 0 comments
- 0 likes
- 500 views
A dual emitting acridinedione fluorophore, 9-(4-(dimethylamino)phenyl)-3,4,6,7,9,10-hexahydroacridine-1,8(2H,5H)-dione (DMAADR-1), was synthesized and its dual fluorescence behavior was found to be greatly affected to the presence of both transition me...
Specific Ca2+ Fluorescent Sensor: Signaling by Conformationally Induced PET Suppression in a Bichromophoric Acridinedione
- Posted by Ashokkumar
- November 20, 2010
- 0 comments
- 0 likes
- 504 views
A series of acridinedione based bichromophoric podand systems 1a-c, were synthesized and characterized. Among these, the bichromophore 1c shows specific binding of Ca2+ in the presence of other biologically important metal ions like Na+, K+, Mg2+ & Zn2...
Unprecedented formation of an N-benzamidobisthiourea derivative and its role in the formation of a new CT state specific towards fluoride ion
- Posted by Ashokkumar
- November 20, 2010
- 0 comments
- 0 likes
- 425 views
A novel N-benzamidobisthiourea derivative (1) was synthesized. Tuning of its emission from the locally excited (LE) state to the charge transfer (CT) state was observed specifically for fluoride ion.
Fluorescence Spectroscopic Evidence for Hydrogen Bonding and Deprotonation Equilibrium between Fluoride and a Thiourea Derivative
- Posted by Ashokkumar
- November 20, 2010
- 0 comments
- 0 likes
- 458 views
Abstract: Interaction of anions with thiourea linked acridinedione fluorophore was studied by absorption, 1H NMR, steady state and time-resolved fluorescence techniques. Addition of AcO- and H2PO4- shows a genuine H-bonded complex with thio...