Near-infrared phosphorescence emission of Zn(II) coordination polymer based on 3,5-bis(1-imidazoly)pyridine: Syntheses, structure and photoelectron performance
Abstract
Long wavelength of near infrared (NIR) room temperature phosphorescence (RTP) emission is a kind of highly desirable materials. In this study, with the self-assembly reaction of D-A-D type semi-rigid 3,5-bis(1-imidazoly)pyridine (BMP) organic ligand and Zn(II) ions, one ionic coordination polymer (CP) {[Zn0.5(BMP)(H2O)]·(NO3)} (1) has been synthesized and characterized. The as-synthesized 1 exhibits highly prolonged phosphorescence lifetime more than 6000 times as long as that of the pristine BMP phosphor ligand. Theory calculation indicates that NO3- counter ions highly affect the electronic structure and energy levels of the cationic CP host. By a facile anionic exchange, Eosin Y (EY) dye guest encapsulated into the CP host can significantly tune the phosphorescence color from yellow to rare example of near infrared emission through an efficient phosphorescence energy transfer. In addition, the optoelectronic performance of 1 and EY@1 have also been studied.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- November 2019
- DOI:
- 10.1016/j.jssc.2019.120958
- Bibcode:
- 2019JSSCh.27920958L
- Keywords:
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- Coordination polymers;
- Phosphorescence;
- Crystal structure;
- Host-guest