@article {1191,
	title = {Tunable Emission from Fluorescent Organic Nanoparticles in Water: Insight into the Nature of Self-Assembly and Photoswitching},
	journal = {Chemistry {\textendash} A European Journal},
	volume = {24},
	year = {2018},
	pages = {2643-2652},
	abstract = {<p>Abstract Excitation-dependent tuning of the emission behavior of fluorescent organic nanoparticles (FONs) with two simple luminescent pyrenyl{\textendash}pyridyl conjugates as model systems is demonstrated. In the case of the compound with a flexible bis-picolyl moiety, the simultaneous presence of multiple ground-state species with distinct absorption and emission characteristics can be observed. The relative ratios of these species can easily be modulated, and it is possible to selectively stimulate any one of them individually by choosing an appropriate excitation channel. Moreover, at high concentration, a drastic change in the nature of the self-assembly is observed, which shifts from donor{\textendash}acceptor-type self-assembly to exciplex-type self-agglomeration. On the contrary, the compound containing a rigid terpyridine unit has only a single ground state and shows no such tunable emission. However, it can exhibit multiple emission bands in water, whereby the positions of their emission maxima depend on the extent of aggregation-induced planarization of the probe molecules. Overall, this work demonstrates multimodal modulation of FON emission and a gives insight into how molecular order can translate into complete switching of nanoparticle self-assembly and photophysics.</p>
},
	keywords = {aggregation, Fluorescence, nanoparticles, self-assembly},
	doi = {10.1002/chem.201704607},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/chem.201704607},
	author = {Gulyani Akash and Dey Nilanjan and Bhattacharya Santanu}
}
@article {1202,
	title = {Facile Synthesis of Highly Sensitive, Red-Emitting, Fluorogenic Dye for Microviscosity and Mitochondrial Imaging in Embryonic Stem Cells},
	journal = {ChemistrySelect},
	volume = {2},
	year = {2017},
	pages = {4609-4616},
	abstract = {<p>Abstract Bright, sensitive fluorescent probes that respond to changes in the cellular microenvironment are extremely valuable for imaging cellular dynamics. We report a simple, one-step synthesis of a new hemicaynine (HC-1) dye as a sensitive, red-emitting (λmax-610 nm) fluorogenic probe for micro-viscosity and local order in diverse environments, including live cells. HC-1 responds to increasing micro-viscosity through changes in fluorescence intensity and lifetime, and is sensitive enough to report dynamic micellar self-assembly. While HC-1 shows properties of a molecular {\textquoteleft}rotor{\textquoteright}, time-dependent density functional theoretical analysis reveals that in HC-1, an inhibition of photo-isomerization in viscous environment is the likely cause of fluorescence enhancement. HC-1 localizes to mitochondria in live cells and responds to mitochondrial ordering through a significant increase in fluorescence. Strikingly, we show that HC-1 is also a sensitive probe for the spatial heterogeneity of mitochondrial organization in embryonic stem cells as well as dynamic remodeling of the mitochondria in early-differentiated cells.</p>
},
	keywords = {Embryonic Stem Cells, Live cell imaging, Microviscosity, Mitochondrial fluorescent probe, Photoisomerization},
	doi = {10.1002/slct.201700463},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/slct.201700463},
	author = {Raja Sufi O. and Sivaraman Gandhi and Mukherjee Ananya and Duraisamy Chellappa and Gulyani Akash}
}
