Philip Anthony | SASTRA University (original) (raw)

Papers by Philip Anthony

Materials Advances, 2021

Pyridine appended structural isomers showed a planar or propeller conformation dependent molecula... more Pyridine appended structural isomers showed a planar or propeller conformation dependent molecular self-assembly, fluorescent polymorphs, stimuli-responsive fluorescence switching and halochromism.

Supramolecular chemistry provides a versatile approach to tune organic solid state luminescence b... more Supramolecular chemistry provides a versatile approach to tune organic solid state luminescence by controlling the molecular organization through weak interactions. In this study, we have successfully tuned the solid state luminescence of 2-cyano-3(4-(diphenylamino)phenyl)acrylic acid (CDPA) by co-crystallizing with substituted pyridines. The position of methyl group on the pyridine (4-picoline, 3-picoline, and 2-picoline) has a dramatic effect on the supramolecular interactions formed, from usual carboxylic acid-pyridine interactions to deprotonation of CDPA in the crystal lattice and that allows to tune the CDPA solid state luminescence from 587 to 548 nm gradually.

Nano/microstructure fabrication of 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), an org... more Nano/microstructure fabrication of 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), an organic optoelectronic material, via a simple reprecipitation method produces particles with a different morphology, phase, and structure and a tailored luminescence. Spherical amorphous, diamond, and multifaceted microcrystals of CDPA were obtained by optimizing the fabrication conditions. CDPA with rod-like morphology was produced on the introduction of polymer additives to the growth solution. A polymorph of CDPA, not observed in the usual solution crystallization process, was obtained as 1D nanowires (200-400 nm (width) and 3-20 µm (length)). Powder X-ray diffraction and optical studies demonstrate the polymorphic structure of the nanowires. Scanning electron and confocal fluorescence microscopy, respectively, were used to demonstrate the different morphologies of fabricated nano/microstructures and the luminescence tuning (from 604 to 519 nm).

The direct synthesis of CdSe nanoparticles inside the core of PS-P4VP micellar structures has bee... more The direct synthesis of CdSe nanoparticles inside the core of PS-P4VP micellar structures has been utilized for the easy fabrication of 2-D CdSe nanoparticle arrays with variable sizes on a solid substrate.

In the present study, the syntheses of crystalline silver and gold nanoparticles (NPs) has been d... more In the present study, the syntheses of crystalline silver and gold nanoparticles (NPs) has been demonstrated in a green and environmentally friendly approach using citrus fruit extracts (lemon, Citrus limon (Cl-1) and sweet orange, Citrus limetta (Cl-2)). In addition, potentially hazardous metal ion sensing properties of these NPs in aqueous solution has been explored. Cl-1 and Cl-2 that predominantly contained citric and ascorbic acid, exhibited different reducing abilities towards silver and gold ions into NPs. Cl-1 reduces silver ions into AgNPs only in the presence of sunlight whereas AuNPs from gold ions were formed without exposure to sunlight. In contrast, Cl-2 converts both silver and gold ions into the corresponding NPs in the absence of sunlight. The colorimetric sensor studies of these green synthesized AgNPs (Cl-1-AgNPs) showed selective sensing of the potentially hazardous Hg 2+ ion in water at micromolar concentrations. More importantly, green synthesized Cl-1-AgNPs sensor systems detected Hg 2+ ions in water in a wide pH range (3.2 to 8.5). ; Fax: +91 4362264120; Tel: +91 4362264101 † Electronic supplementary information (ESI) available: Digital images of citric acid and trisodium citrate AgNPs sensor studies and tape water sensor studies of Cl-1-AgNPs. See

Selective colorimetric sensing of toxic metal cations by green synthesized silver nanoparticles o... more Selective colorimetric sensing of toxic metal cations by green synthesized silver nanoparticles over a wide pH range3

Colorimetric sensor Toxic metal ions sensor Cd 2+ sensor Pb 2+ sensor a b s t r a c t N-(2-hydrox... more Colorimetric sensor Toxic metal ions sensor Cd 2+ sensor Pb 2+ sensor a b s t r a c t N-(2-hydroxybenzyl)-valine (VP) and N-(2-hydroxybenzyl)-isoleucine (ILP) organic ligands have been utilized as reducing and surface functionalizing agents in the synthesis of silver nanoparticles (AgNPs) with metal ion interacting functionality. VP and ILP metal interacting ligands functionalized AgNPs exhibited selective colorimetric sensing of toxic Cd 2+ , Hg 2+ and Pb 2+ metal ions in aqueous solution at ppm level. The colorimetric sensitivity and metal ion selectivity of VP-and ILP-AgNPs were modulated by incorporating co-stabilizing agents. Importantly, ILP functionalized AgNPs selectively detected Cd 2+ ions in the polluted ground water samples also.

Turn-off fluorescence of organic fluorophore, [1,2,3]triazol-2-yl)phenyl]carboxylic acid (NTPC), ... more Turn-off fluorescence of organic fluorophore, [1,2,3]triazol-2-yl)phenyl]carboxylic acid (NTPC), with metal ions (Fe 3+ , Cu 2+ , Pb 2+ ) was converted into turn-on fluorescent sensor for biologically important Zn 2+ , Cu 2+ and Fe 3+ metal ions in aqueous solution at ppb level by exploiting strong fluorescence quenching phenomena of metal nanoparticles when organic fluorophores assembled in the vicinity of metallic surface. Amino acid attached phenolic ligands (L) were used as reducing as well as functional capping agents in the synthesis of silver nanoparticles (AgNPs). The hydrogen bonding functionality of L facilitated the assembling of NTPC in the vicinity of metallic surfaces that leads to complete quenching of NTPC fluorescence. The strong and selective coordination of L with metal ions (Zn 2+ , Cu 2+ and Fe 3+ ) separates the NTPC from the AgNPs surface that turn-on the NTPC fluorescence. HR-TEM and absorption studies confirm the metal coordination with L and separation of NTPC from the AgNPs surface. Mn 2+ showed selective red shifting of NTPC fluorescence after 12 h with all sample. Effects of different amino acid attached phenolic ligands were explored in the metal ion sensitivity and selectivity. This approach demonstrates the multifunctional utility of metal NPs in the development of turn-on fluorescence sensor for paramagnetic heavy metal ions in aqueous solution.

Materials Advances, 2021

Pyridine appended structural isomers showed a planar or propeller conformation dependent molecula... more Pyridine appended structural isomers showed a planar or propeller conformation dependent molecular self-assembly, fluorescent polymorphs, stimuli-responsive fluorescence switching and halochromism.

Supramolecular chemistry provides a versatile approach to tune organic solid state luminescence b... more Supramolecular chemistry provides a versatile approach to tune organic solid state luminescence by controlling the molecular organization through weak interactions. In this study, we have successfully tuned the solid state luminescence of 2-cyano-3(4-(diphenylamino)phenyl)acrylic acid (CDPA) by co-crystallizing with substituted pyridines. The position of methyl group on the pyridine (4-picoline, 3-picoline, and 2-picoline) has a dramatic effect on the supramolecular interactions formed, from usual carboxylic acid-pyridine interactions to deprotonation of CDPA in the crystal lattice and that allows to tune the CDPA solid state luminescence from 587 to 548 nm gradually.

Nano/microstructure fabrication of 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), an org... more Nano/microstructure fabrication of 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), an organic optoelectronic material, via a simple reprecipitation method produces particles with a different morphology, phase, and structure and a tailored luminescence. Spherical amorphous, diamond, and multifaceted microcrystals of CDPA were obtained by optimizing the fabrication conditions. CDPA with rod-like morphology was produced on the introduction of polymer additives to the growth solution. A polymorph of CDPA, not observed in the usual solution crystallization process, was obtained as 1D nanowires (200-400 nm (width) and 3-20 µm (length)). Powder X-ray diffraction and optical studies demonstrate the polymorphic structure of the nanowires. Scanning electron and confocal fluorescence microscopy, respectively, were used to demonstrate the different morphologies of fabricated nano/microstructures and the luminescence tuning (from 604 to 519 nm).

The direct synthesis of CdSe nanoparticles inside the core of PS-P4VP micellar structures has bee... more The direct synthesis of CdSe nanoparticles inside the core of PS-P4VP micellar structures has been utilized for the easy fabrication of 2-D CdSe nanoparticle arrays with variable sizes on a solid substrate.

In the present study, the syntheses of crystalline silver and gold nanoparticles (NPs) has been d... more In the present study, the syntheses of crystalline silver and gold nanoparticles (NPs) has been demonstrated in a green and environmentally friendly approach using citrus fruit extracts (lemon, Citrus limon (Cl-1) and sweet orange, Citrus limetta (Cl-2)). In addition, potentially hazardous metal ion sensing properties of these NPs in aqueous solution has been explored. Cl-1 and Cl-2 that predominantly contained citric and ascorbic acid, exhibited different reducing abilities towards silver and gold ions into NPs. Cl-1 reduces silver ions into AgNPs only in the presence of sunlight whereas AuNPs from gold ions were formed without exposure to sunlight. In contrast, Cl-2 converts both silver and gold ions into the corresponding NPs in the absence of sunlight. The colorimetric sensor studies of these green synthesized AgNPs (Cl-1-AgNPs) showed selective sensing of the potentially hazardous Hg 2+ ion in water at micromolar concentrations. More importantly, green synthesized Cl-1-AgNPs sensor systems detected Hg 2+ ions in water in a wide pH range (3.2 to 8.5). ; Fax: +91 4362264120; Tel: +91 4362264101 † Electronic supplementary information (ESI) available: Digital images of citric acid and trisodium citrate AgNPs sensor studies and tape water sensor studies of Cl-1-AgNPs. See

Selective colorimetric sensing of toxic metal cations by green synthesized silver nanoparticles o... more Selective colorimetric sensing of toxic metal cations by green synthesized silver nanoparticles over a wide pH range3

Colorimetric sensor Toxic metal ions sensor Cd 2+ sensor Pb 2+ sensor a b s t r a c t N-(2-hydrox... more Colorimetric sensor Toxic metal ions sensor Cd 2+ sensor Pb 2+ sensor a b s t r a c t N-(2-hydroxybenzyl)-valine (VP) and N-(2-hydroxybenzyl)-isoleucine (ILP) organic ligands have been utilized as reducing and surface functionalizing agents in the synthesis of silver nanoparticles (AgNPs) with metal ion interacting functionality. VP and ILP metal interacting ligands functionalized AgNPs exhibited selective colorimetric sensing of toxic Cd 2+ , Hg 2+ and Pb 2+ metal ions in aqueous solution at ppm level. The colorimetric sensitivity and metal ion selectivity of VP-and ILP-AgNPs were modulated by incorporating co-stabilizing agents. Importantly, ILP functionalized AgNPs selectively detected Cd 2+ ions in the polluted ground water samples also.

Turn-off fluorescence of organic fluorophore, [1,2,3]triazol-2-yl)phenyl]carboxylic acid (NTPC), ... more Turn-off fluorescence of organic fluorophore, [1,2,3]triazol-2-yl)phenyl]carboxylic acid (NTPC), with metal ions (Fe 3+ , Cu 2+ , Pb 2+ ) was converted into turn-on fluorescent sensor for biologically important Zn 2+ , Cu 2+ and Fe 3+ metal ions in aqueous solution at ppb level by exploiting strong fluorescence quenching phenomena of metal nanoparticles when organic fluorophores assembled in the vicinity of metallic surface. Amino acid attached phenolic ligands (L) were used as reducing as well as functional capping agents in the synthesis of silver nanoparticles (AgNPs). The hydrogen bonding functionality of L facilitated the assembling of NTPC in the vicinity of metallic surfaces that leads to complete quenching of NTPC fluorescence. The strong and selective coordination of L with metal ions (Zn 2+ , Cu 2+ and Fe 3+ ) separates the NTPC from the AgNPs surface that turn-on the NTPC fluorescence. HR-TEM and absorption studies confirm the metal coordination with L and separation of NTPC from the AgNPs surface. Mn 2+ showed selective red shifting of NTPC fluorescence after 12 h with all sample. Effects of different amino acid attached phenolic ligands were explored in the metal ion sensitivity and selectivity. This approach demonstrates the multifunctional utility of metal NPs in the development of turn-on fluorescence sensor for paramagnetic heavy metal ions in aqueous solution.