A 4-(naphthalen-1-ylethynyl) aniline appended rhodamine based fluorescent chemosensor 'NAP-RD' is synthesized which undergoes through bond energy transfer in the presence of Sn2+ ions in mixed aqueous media. NAP-RD is an excellent colorimetric and fluorescence ratiometric probe which recognizes traces of Sn2+ in real samples and a fluorescence indicator in living RAW264.7 cells. The new sensing probe NAP-RD shows higher sensitivity as well as faster response compared to the reported systems. The detection limit of NAP-RD is 5 × 10-9 M. DFT studies strongly support the experimental results. © The Royal Society of Chemistry 2016.

SUSANTA ADHIKARI

Chemistry

ASHUTOSH GHOSH

S GURIA

A SAHANA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

RSC Advances

4-Hydroxy-5-isopropyl-2-methylisophthalaldehyde anchored rhodamine B derivative, RDDFT experiences Fe3+ assisted inhibition of photoinduced electron transfer (PET), chelation-enhanced fluorescence (CHEF) and fluorescence resonance energy transfer (FRET) process in aqueous buffered acetonitrile media. RDDFT is an excellent colorimetric Fe3+ probe that undergoes ratiometric fluorescence change to recognize and determine traces of Fe3+ in presence of Fe2+ in real sample, thus allowing speciation studies of iron. It detects as low as 2 × 10−8 M Fe3+ with an association constant, 3.7025 × 106 M−1. Common ions do not show any significant interference in the detection of Fe3+ ion. RDDFT efficiently images intracellular Fe3+ in HeLa cells under fluorescence microscope. DFT studies strongly support experimental findings. © 2017 Elsevier B.V.

Sensors and Actuators, B: Chemical

Ratiometric sensing of Fe3+ through PET-CHEF-FRET processes: Live cell imaging, speciation and DFT studies

A through bond energy transfer based ratiometric probe for fluorescent imaging of Sn2+ ions in living cells

A systematic journey from O-donor through S-donor to N-donor chelator led to the development of a highly selective Au3+ chemosensor that operates via a CHEF-induced FRET mechanism. This sensing protocol avoids unwanted possible side reactions observed in alkyne-based gold sensors. DFT studies strongly support the experimental facts. The probe RT-2 detects Au3+ in the presence of the masking agent KI to minimize Hg2+ interference; however, RQ-2 selectively detects Au3+ without any interference and shows reversibility in the sensing in the presence of tetrabutylammonium cyanide. The probe efficiently images Au3+ in living HeLa cells under a fluorescence microscope. © 2015 American Chemical Society.

Journal of Organic Chemistry

Strategically Modified Rhodamine-Quinoline Conjugate as a CHEF-Assisted FRET Probe for Au3+: DFT and Living Cell Imaging Studies

An acridone based highly Zn2+ selective, cell-permeable turn-on fluorescence probe (AAS) shows yellow fluorescence at 560 nm (λex, 445 nm) in dry methanol/DMSO up to 100 μM Zn2+. At higher Zn2+ concentration (&gt;100 μM in dry methanol) AAS yields a red solid polymeric complex having strong emission at 605 nm. Interestingly, the red solid polymer also appears at relatively lower Zn2+ concentration (&gt;50 μM) in water. The lowest detection limit of AAS is 0.1 nM Zn2+. AAS is employed for fluorescence bio-imaging of Zn2+ in human MCF 7 breast cancer cells and HeLa cells. Moreover, AAS develops an orange colour detectable by the naked eye in the presence of trace Zn2+ in a mixture of various common cations and anions in the solid state (requires no solvent). Hence, this method is extremely green and interference free. AAS can be employed as a laboratory indicator for detection of Zn2+ in real samples and live cells. © The Royal Society of Chemistry 2015.

Journal	Data powered by TypesetRSC Advances
Publisher	Data powered by TypesetRoyal Society of Chemistry
ISSN	2046-2069
Open Access	No