<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Venugopal, Geethu</style></author><author><style face="normal" font="default" size="100%">Kumar, Viksit</style></author><author><style face="normal" font="default" size="100%">Jadhav, Ashok Badrinarayan</style></author><author><style face="normal" font="default" size="100%">Dongre, Sangram D.</style></author><author><style face="normal" font="default" size="100%">Khan, Abujunaid</style></author><author><style face="normal" font="default" size="100%">Gonnade, Rajesh</style></author><author><style face="normal" font="default" size="100%">Kumar, Jatish</style></author><author><style face="normal" font="default" size="100%">Santhosh Babu, Sukumaran</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Boron- and oxygen-doped π-extended helical nanographene with circularly polarised thermally activated delayed fluorescence</style></title><secondary-title><style face="normal" font="default" size="100%">Chemistry-A European Journal</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">circularly polarized luminescence</style></keyword><keyword><style  face="normal" font="default" size="100%">DOBNA</style></keyword><keyword><style  face="normal" font="default" size="100%">dual emission</style></keyword><keyword><style  face="normal" font="default" size="100%">nanographene</style></keyword><keyword><style  face="normal" font="default" size="100%">TADF</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2024</style></year><pub-dates><date><style  face="normal" font="default" size="100%">APR </style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">30</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;
	Helical nanographenes have garnered substantial attention owing to their finely adjustable optical and semiconducting properties. The strategic integration of both helicity and heteroatoms into the nanographene structure, facilitated by a boron-oxygen-based multiple resonance (MR) thermally activated delayed fluorescence (TADF), elevates its photophysical and chiroptical features. This signifies the introduction of an elegant category of helical nanographene that combines optical (TADF) and chiroptical (CPL) features. In this direction, we report the synthesis, optical, and chiroptical properties of boron, oxygen-doped pi-extended helical nanographene. The pi-extension induces distortion in the DOBNA-incorporated nanographene, endowing a pair of helicenes, (P)-B2NG, and (M)-B2NG exhibiting circularly polarized luminescence with glum of -2.3x10-3 and +2.5x10-3, respectively. B2NG exhibited MR-TADF with a lifetime below 5 mu s, and a reasonably high fluorescence quantum yield (50 %). Our molecular design enriches the optical and chiroptical properties of nanographenes and opens up new opportunities in multidisciplinary fields. B, O-doped pi-extended helical nanographene has been explored for its optical and chiroptical properties. The presence of helical and nanographene segments stabilize the helicity and imparts tunable optical properties. Helical nanographene display circularly polarized thermally activated delayed fluorescence. image&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">19</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">&lt;p&gt;
	Foreign&lt;/p&gt;
</style></custom3><custom4><style face="normal" font="default" size="100%">&lt;p&gt;
	4.3&lt;/p&gt;
</style></custom4></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kumar, Viksit</style></author><author><style face="normal" font="default" size="100%">Dongre, Sangram D.</style></author><author><style face="normal" font="default" size="100%">Vandhanam, Aparna</style></author><author><style face="normal" font="default" size="100%">Jadhav, Ashok Badrinarayan</style></author><author><style face="normal" font="default" size="100%">Kumar, Jatish</style></author><author><style face="normal" font="default" size="100%">Babu, Sukumaran Santhosh</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">(Chiro)optical Properties of π-Extended Spiro-Double Carbo[7]helicene</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry Letters</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2025</style></year><pub-dates><date><style  face="normal" font="default" size="100%">NOV </style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">16</style></volume><pages><style face="normal" font="default" size="100%">11657-11664</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;
	Helical nanographenes are a fascinating class of pi-extended chiral nanocarbons, where structural helicity imparts intrinsic chirality and unique optoelectronic properties to the rigid carbon framework. In this work, we synthesized a hexa-peri-hexabenzocoronene-based pi-extended spiro-double carbo[7]helicene. The helical distortion of the structure was unambiguously confirmed by X-ray crystallography. The optical properties were explored through UV-Vis absorption, fluorescence, and phosphorescence measurements, complemented by density functional theory (DFT) calculations. Remarkably, the pi-extended spiro-double carbo[7]helicene exhibited thermally activated delayed fluorescence (TADF) at room temperature and phosphorescence at low temperatures. Chiral HPLC successfully resolved the enantiomers into three fractions: (PP), (MM), and the meso forms (PM)/(MP), and chiroptical studies of the pure enantiomers revealed a moderately high g lum value of 1.58 x 10-3. Finally, the origin of the observed dissymmetry factors was rationalized by analyzing the transition electric dipole moments (TEDM) and transition magnetic dipole moments (TMDM) derived from time-dependent density functional theory (TD-DFT) calculations.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">45</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">&lt;p&gt;
	Foreign&lt;/p&gt;
</style></custom3><custom4><style face="normal" font="default" size="100%">&lt;p&gt;
	5.1&lt;/p&gt;
</style></custom4></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kumar, Viksit</style></author><author><style face="normal" font="default" size="100%">Venugopal, Geethu</style></author><author><style face="normal" font="default" size="100%">Jadhav, Ashok Badrinarayan</style></author><author><style face="normal" font="default" size="100%">Dongre, Sangram D.</style></author><author><style face="normal" font="default" size="100%">Gonnade, Rajesh</style></author><author><style face="normal" font="default" size="100%">Kumar, Jatish</style></author><author><style face="normal" font="default" size="100%">Ruer, Paul C.</style></author><author><style face="normal" font="default" size="100%">Hupp, Benjamin</style></author><author><style face="normal" font="default" size="100%">Steffen, Andreas</style></author><author><style face="normal" font="default" size="100%">Babu, Sukumaran Santhosh</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Regioisomeric π-extended nanographene with long-lived phosphorescence afterglow</style></title><secondary-title><style face="normal" font="default" size="100%">Angewandte Chemie-International Edition</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Afterglow</style></keyword><keyword><style  face="normal" font="default" size="100%">CPL</style></keyword><keyword><style  face="normal" font="default" size="100%">Helicenes</style></keyword><keyword><style  face="normal" font="default" size="100%">nanographene</style></keyword><keyword><style  face="normal" font="default" size="100%">Phosphorescence</style></keyword><keyword><style  face="normal" font="default" size="100%">TADF</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2025</style></year><pub-dates><date><style  face="normal" font="default" size="100%">FEB</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">64</style></volume><pages><style face="normal" font="default" size="100%">e202422125</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;
	The cutouts of graphene sheets, particularly those with a nonplanar topology, present vast opportunities for advancement. Even a slight deviation from the planar structure can lead to intriguing (chiro)optical features for helically twisted nanographenes. In this context, we introduce two regioisomeric pi-extended nanographenes that exhibit distinct excited-state characteristics. The helicene structure and the photophysical features can be easily tuned by changing the connecting position of the nanographene to the carbazole core (2,7- and 3,6-). Single-crystal X-ray diffraction analysis confirmed the formation of nanographenes with bent and helical conformations. Both derivatives exhibited thermally activated delayed fluorescence at room temperature and phosphorescence at low temperatures. Notably, the nanographene with the bent structure displayed an impressive red afterglow lasting over 30seconds, in contrast to the very weak afterglow observed in the helical structure. DFT calculations revealed the existence of an isoenergetic higher triplet state (T-8) and comparatively weak spin-orbit coupling (T-1-S-0), thereby enabling the bent nanographene to exhibit a long-lived component and strong afterglow. Our findings highlight the significance of regioisomeric nanographenes with exceptional optical properties and offer a deeper understanding of the structure-property relationship in nonplanar nanographenes.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">6</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">&lt;p&gt;
	Foreign&lt;/p&gt;
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	17&lt;/p&gt;
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