• MANGALAMPALLI RAVIKANTH

      Articles written in Journal of Chemical Sciences

    • Synthesis and properties of Oxasmaragdyrins containing one Five-membered Heterocycle at Meso-position

      BOORUGA UMASEKHAR PALLAB SAMANTA TAMAL CHATTERJEE MANGALAMPALLI RAVIKANTH

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      The oxasmaragdyrins containing one five membered heterocycle such as pyrrole, thiophene and furan in place of one of the meso-phenyl group were synthesized by acid-catalyzed oxidative coupling reaction of meso-heterocycle substituted dipyrromethane with 16-oxatripyrrane in the presence of catalytic amountof trifluoroacetic acid followed by oxidation with DDQ. The smaragdyrin macrocycles containing one fivemembered heterocycle at meso-position were characterized by HR-MS and detailed 1D and 2D NMR studies. The absorption and fluorescence studies revealed that the presence of five membered heterocycle at mesoposition of smaragdyrin resulted in bathochromic shifts in absorption and emission bands with slight reduction in quantum yields compared to smraragdyrin macrocycle containing six membered meso-phenyl groups. Theelectrochemical studies revealed that the meso-heterocycle smaragdyrins are electron deficient compared to meso-phenyl smaragdyrins.

    • 3-Pyrrolyl BODIPY Based Selective Cu2+ Ion ‘‘Off-On’’ Fluorescent Sensor

      PANCHAVARNAM SABARI MANGALAMPALLI RAVIKANTH

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      3-Pyrrolyl BODIPY-Schiff base conjugate was synthesized by treating α-formyl 3-pyrrolylBODIPY with o-hydroxy aniline in ethanol at reflux followed by recrystallization. The conjugate wasthoroughly characterized by HR-MS, 1D & 2D NMR and X-ray crystallography. The X-ray analysisrevealed that the BODIPY core was in planar arrangement, with the central boron atom coordinated withtwo pyrrole nitrogens of dipyrrin moieties and two axial fluoride ions in a tetrahedral geometry. The3-pyrrolyl BODIPY-Schiff base conjugate exhibited a strong absorption band at 616 nm and broad weakfluorescence band at 660 nm. The absorption and fluorescence titration studies with various metal ionsrevealed that 3-pyrrolyl BODIPY can act as colorimetric optical sensor and specific ‘‘off-on’’ fluorescentsensor for Cu2+ ion.

      SYNOPSIS: 3-Pyrrolyl BODIPY-Schiff base conjugate was synthesized starting from α-formyl 3-pyrrolyl BODIPY. The conjugate was thoroughly characterized by HR-MS, NMR and X-ray crystallography. The absorption and fluorescence titration studies with various metal ions revealed that 3-pyrrolyl BODIPY can act as specific “off-on” fluorescent sensor for Cu2+ion.

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