UNSPECIFIED (2017) 11.1. Hendrik - ARTIKEL: Supramolecular Phosphorescent. Indonesian Journal of Chemistry, 17 (2). pp. 191-202. ISSN 1411-9420 (print); 2460-1578 (online)

Preview

Archive (ARTIKEL: Supramolecular Phosphorescent) 11.1._Hendrik_ARTIKEL_supramolecular_phosphorescent.pdf - Published Version Download (3MB) | Preview

Abstract

We highlight that by using supramolecular single crystals of phosphorescent trinuclear copper(I) pyrazolate complexes with different molecular structures (2A-E), vapochromic chemosensors were successfully designed for sensing ethanol with high sensing capability. These complexes 2A-E were synthesized from non-side chain, 3,5-dimethyl, 3,5- bis(trifluoromethyl), 3,5-diphenyl and 4-(3,5-dimethoxybenzyl)-3,5-dimethyl pyrazole ligands (1A-E) in 83, 97, 99, 88 and 85% yields, respectively. All complexes showed emission bands centered at 553, 584, 570 and 616 nm upon an excitation at 280 nm for complexes 2A-C,E, respectively and 642 nm upon an excitation at 321 nm for complex 2D with lifetime in microseconds, indicating a large Stoke shift for phosphorescent compounds. These emission spectra were in good agreement with their colors from green to red upon exposure to a UV lamp with an excitation at 254 nm in dark room. Upon exposure to ethanol in 5 min, quenching, photoinduced energy transfer and shifting of emission intensities were observed for chemosensors 2A-C, 2D and 2E, respectively. Interestingly, chemosensor 2E only showed completely and autonomously recovery of its original emission intensity. Such novel finding in sensing capability might be caused by a weak intermolecular hydrogen bonding interaction of ethanol to oxygen atoms at dimethoxybenzyl side-chains of the pyrazole ring.

Item Type:	Article
Subjects:	A General Works > AI Indexes (General)
Depositing User:	Administrator Ma Chung
Date Deposited:	12 Nov 2017 21:06
Last Modified:	12 Nov 2017 21:06
URI:	http://eprints.machung.ac.id//id/eprint/56

Actions (login required)

View Item