Charge Transfer and Exciplex Emissions from a Naphthalenediimide-Entangled Coordination Framework Accommodating Various Aromatic Guests

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• 作者：Virginia Mart铆nez-Mart铆nez ; Shuhei Furukawa ; Yohei Takashima ; I帽igo L贸pez Arbeloa ; Susumu Kitagawa
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：December 13, 2012
• 年：2012
• 卷：116
• 期：49
• 页码：26084-26090
• 全文大小：387K
• 年卷期：v.116,no.49(December 13, 2012)
• ISSN：1932-7455

文摘

A detailed photophysical study was performed on an entangled porous coordination polymer (PCP) containing N,N鈥?dipyrid-4-yl-1,4,5,8-naphthalenediimide (dpNDI) as an electron acceptor moiety and different substituted benzene guests as electron donor units by time-resolved fluorescence spectroscopy. Emission from exciplex (A鈥揇)*_EX and charge transfer complex (A^{未鈭?/sup>鈥揇未+)*_CT states was identified thanks to the different conformations adopted by aromatic guests in the different adsorption sites of the PCP (denominated pore A and pore B). Fluorescence lifetime values of exciplexes and charge transfer complexes linearly correlate with the dipole moments and the ionization potentials of different substituted benzene guests, respectively. We have also identified other emissive species with much lower emission efficiency, that is, emission from the NDI pillar itself and from its interaction with the benzenedicarboxylate linker.}