Issue 3, 2012
From the journal:

CrystEngComm

Cocrystals assembled by pyrene and 1,2- or 1,4-diiodotetrafluorobenzenes and their phosphorescent behaviors modulated by local molecular environment†

Qian Jin Shen,a   Hong Qing Wei,a   Wen Sheng Zou,a   Hao Ling Sun*a  and  Wei Jun Jin*a  

* Corresponding authors

a College of Chemistry, Beijing Normal University, Beijing, P. R. China
E-mail: wjjin@bnu.edu.cn, haolingsun@bnu.edu.cn
Fax: +86 58802146
Tel: +86 58802146

Abstract

Two supramolecular cocrystals, 1, pyrene/1,4-diiodotetrafluorobenzene (1,4-DITFB), and 2, pyrene/1,2-diiodotetrafluorobenzene (1,2-DITFB), have been prepared and characterized using X-ray diffraction analysis and multiple spectroscopic methods. Several intermolecular interactions such as C–I⋯I–C, C–I⋯π, π–π and C–H⋯F were observed in cocrystal 1 and/or 2, in which DITFB molecules act simultaneously as an isolator to prevent the pyrene molecule from aggregating and also as a heavy atom effect agent to induce phosphorescence emission from pyrene. The spectral results demonstrate that the two cocrystals both display strong phosphorescence at room temperature with decay rates of 1.7 × 103 s−1 and 0.22 × 103 s−1, respectively. The differences in the phosphorescence behavior between 1 and 2 are relevant to the local molecular environment created by 1,4- or 1,2-DITFB in cocrystals.

Graphical abstract: Cocrystals assembled by pyrene and 1,2- or 1,4-diiodotetrafluorobenzenes and their phosphorescent behaviors modulated by local molecular environment

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Article information

DOI
https://doi.org/10.1039/C1CE06069D
Article type
Paper
Submitted
19 Aug 2011
Accepted
18 Oct 2011
First published
24 Nov 2011

CrystEngComm, 2012,14, 1010-1015

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Cocrystals assembled by pyrene and 1,2- or 1,4-diiodotetrafluorobenzenes and their phosphorescent behaviors modulated by local molecular environment

Q. J. Shen, H. Q. Wei, W. S. Zou, H. L. Sun and W. J. Jin, CrystEngComm, 2012, 14, 1010 DOI: 10.1039/C1CE06069D

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