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Principles Of Fluorescence Spectroscopy

An unusual behavior of some organic luminophores in which intensity of emission is enhanced in aggregated condition is known as aggregation induced emission (AIE). The exposure of this concept to the scientific community significantly changes the perception towards conventionally used photophysical phenomena. Due to the high quantum yield and tunable emission properties, AIE luminogens (AIEgens) have become promising candidates for biosensors, opto-electronics and energy applications. The excellent stimuli responsiveness of AIE luminogens (AIEgens) provides them with a key edge for sensitive measurements such as intracellular temperature, pH, etc. In recent times the immense research interest in the AIE phenomenon stems from the inherent solid-state emission as well as its constructive effect on many other phenomena such as mechanochromism, thermally activated delayed fluorescence and circularly polarized luminescence. Many AIE fluorophores readily exhibit mechanochromism but still their interaction with external stimuli results in aggregation caused quenching (ACQ). However, the latest reports shed some light on designing and developing mechanochromophores with enhanced emission. With the inclusion of bright emission, photostability, great signal to noise ratio and non-invasiveness into one package of aggregation induced emission, a significant contribution for the enrichment of the field of photodynamic therapy and theranostics can be foreseen. Hence, the aim of this review is to provide a comprehensive study on recent developments in AIE materials and their mechanochromic, photodynamic therapeutic and theranostic, sensing and electroluminescence applications which offers new possibilities to utilize AIE materials. This review article is devoted to future research perspectives and challenges towards the development of AIE materials for modern technological and therapeutic applications.

Review on new horizons of aggregation induced emission: from design to development

Wood is a sustainable and renewable material that naturally has a hierarchical structure. Cellulose, hemicellulose, and lignin are the three main components of wood. The unique physical and chemical properties of wood and its derivatives endow them with great potential as resources to fabricate advanced materials for use in bioengineering, flexible electronics, and clean energy. Nevertheless, comprehensive information on wood-derived carbon and light-emitting materials is scarce, although much excellent progress has been made in this area. Here, the unique characteristics of wood-derived carbon and light-emitting materials are summarized, with regard to the fabrication principles, properties, applications, challenges, and future prospects of wood-derived carbon and light-emitting materials, with the aim of deepening the understanding and inspiring new ideas in the area of advanced wood-based materials.

Wood-Derived Carbon Materials and Light-Emitting Materials.

Decarboxylative and Deaminative Alkylation of Difluoroenoxysilanes via Photoredox Catalysis: A General Method for Site-Selective Synthesis of Difluoroalkylated Alkanes

https://onlinelibrary.wiley.com/doi/pdf/10.1002/agt2.28

Aggregation‐induced emission materials for nonlinear optics

In the present work, a novel donor (D)–acceptor (A) fluorophore based on indeno-pyrrole derivative (PYROMe) has been utilized as a dual sensor for volatile acids and aromatic amines, where sensory ...

Aggregation-Induced Emission Active Donor–Acceptor Fluorophore as a Dual Sensor for Volatile Acids and Aromatic Amines

The α,α-dihalocarbonyl moiety is a bifunctional system with a gem-dihalocarbon and a carbonyl carbon in 1,2-fashion. This is one of the privileged scaffolds in medicinal chemistry due to its chemical and metabolic stability and lipophilicity. They have also been found in numerous structurally divergent natural products and most of their fabricated structures have already been in medicinal use. Apart from their important use in medicinal chemistry, the α,α-dihalocarbonyl groups have been employed as key building blocks for the development of novel synthetic strategies and utilized as intermediates in total synthesis. In addition to the traditional transformations such as oxidations, reductions, and C-C bond formations, recently several new and non-classical reactions have also been developed. This review provides short description of existing methods for their synthesis and detailed discussion on the efforts for the discovery and development of new reactions by employing α,α-dihaloketones as synthetic building blocks. We have presented their use as key functional groups for the synthesis of polycyclic systems of medicinal and material importance and natural products.

The α,α ‐Dihalocarbonyl Building Blocks: An Avenue for New Reaction Development in Organic Synthesis

A mild strategy for highly regioselective hydration of the alkynes (internal and terminal) has been developed employing intramolecular ketone as the directing group under Ag(I) catalysis In this process both internal and terminal alkynes exhibited 100 % complementary reactivity i e 6-endo-dig vs 5-exo-dig respectively, and provided two regio-isomeric dicarbonyl products as exclusive products This process found very broad scope for the ketones and alkynes The 1,5-diketones were efficiently transformed in to synthetically and pharmaceutically important naphthalene derivatives employing an intramolecular Aldol condensation

Carbonyl Directed Regioselective Hydration of Alkynes under Ag‐Catalysis

We have developed a metal-free, N-iodosuccinimide (NIS)-promoted, cascade strategy for the efficient synthesis of biologically important indeno[1,2-c]pyrroles via a [3+2] annulation process of enamine-alkynes. This methodology had shown a very broad scope for diversely functionalized enamines and alkynes. We have also developed a one-pot, multicomponent strategy for the direct synthesis of indeno-pyrroles from diynones via enamine-alkynes. Control experiments supported the involvement of NIS as an electrophilic activator via an ionic mechanism rather than a radical pathway.

N-Iodosuccinimide-Promoted Rapid Access to Indeno[1,2-c]pyrroles via [3+2] Annulation of Enamine-alkynes

We report the discovery of an anomalous reaction of 2-(alkynonyl)alkynylbenzenes under AgI catalysis for the selective formation of isocoumarins. This reaction is previously undocumented for 2-(alkynonyl)alkynylbenzenes in terms of the reaction mechanism and the product formed. Water (H2 O18 ) labeling studies suggested a possible mechanistic pathway in which the initial formation of a pyrylium ion is followed by hydrative dealkynylation, that is, water incorporation and alkyne expulsion, similar to a retro-Favorskii reaction.

Jampani Santhi

Papers

Aggregation-Induced Emission Active Donor–Acceptor Fluorophore as a Dual Sensor for Volatile Acids and Aromatic Amines

The α,α ‐Dihalocarbonyl Building Blocks: An Avenue for New Reaction Development in Organic Synthesis

Carbonyl Directed Regioselective Hydration of Alkynes under Ag‐Catalysis

N-Iodosuccinimide-Promoted Rapid Access to Indeno[1,2-c]pyrroles via [3+2] Annulation of Enamine-alkynes

An Unusual Conversion of 2‐(Alkynonyl)Alkynylbenzenes to Isocoumarins by a Retro‐Favorskii‐like Degradation