Supramolecular Phosphorescent Trinuclear Copper(I) Pyrazolate Complexes for Vapochromic Chemosensors of Ethanol

Abstract

We highlight that by using supramolecular single crystals of phosphorescent trinuclear copper(I) pyrazolate complexes with different molecular structures (2 A-E ), vapochromic chemosensors were successfully designed for sensing ethanol with high sensing capability. These complexes 2 A-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 samping, 3,5-dimetil, 3,5-bis(trifluorometil), 3,5-difenil dan 4-(3,5-dimetoksibensil)-3,5-dimetil dengan hasil 83, 97, 99, 88 ABSTRAK Kami menyoroti bahwa dengan menggunakan kristal tunggal supramolekul dari kompleks tembaga(I) pirazolat tiganuklir pendarfosfor dengan perbedaan struktur molekul, vapokromik kemosensor telah dengan berhasil dirancang untuk mendeteksi etanol dengan kemampuan deteksi tinggi. Kompleks 2 A-E ini masing-masing telah disintesis dari ligan pirazol (1 A-E ) tidak berantai

Supramolecular assembly of group 11 phosphorescent metal complexes for chemosensors of alcohol derivatives

“…As reported in our paper [17], upon exposure to ethanol vapors in 5 mins until no significant shifting in emission wavelength and color, chemosensor 2(Cu) was found to show shifting phenomenon of the emission band centered at 616 to 554 nm with ∆λ of 62 nm with excitation at 270 nm (Figure 3a) which was in good agreement with its changes in color from bright orange to green (Figure 3e). Interestingly, when chemosensor 2(Ag) was utilized for the same VOC, the emission band centered at 473 nm was significantly quenched in 40% upon excitation at 273 nm (Figure 3b) of its original intensity.…”

“…Hence, chemosensor 2(Cu) provides the best sensing capability for detection of ethanol vapors compared to others. The proposed mechanism for the shifting phenomenon was discussed in the previous report [17], in which the vapors is more likely to use a weak intermolecular hydrogen bonding for interaction with electronegative O atom at the methoxy of the benzyl ring at the outside of the molecules. This shifting phenomenon was also observed for 2(Au) with small ∆λ due to a little bit shorter metal-metal distance compared to 2(Cu).…”

“…Trinuclear copper(I) pyrazolate complex 2(Cu) was prepared according to our previous reports [14][15][16][17]. As shown in Figure 1, at room temperature, the mixture of 4-(3,5-dimethoxybenzyl)-3,5-dimethyl pyrazole ligand (1) and tetrakis (acetonitrile) copper (I) hexafluorophosphate ([Cu(MeCN)4]PF6) in dry tetrahydrofuran (THF) was reacted for 5 mins using a Schlenk technique and followed by adding the distilled dry Et3N under an inert condition.…”

“…Previously, we have reported that phosphorescent trinuclear copper(I) pyrazolate complexes from 3,5-dimethyl and 4-(3,5-dimethoxybenzyl)-3,5-dimethyl pyrazole ligands were successfully synthesized and then used for chemosensors of ethanol vapors [16]. Interestingly, compared to other non-side chain, 3,5-dimethyl, 3,5-bis(trifluoromethyl) and 3,5-diphenyl pyrazole ligands, the resulting trinuclear copper(I) 4-(3,5-dimethoxybenzyl)-3,5-dimethyl pyrazolate complex (2(Cu)) only showed a positive response to ethanol by shifting the emission band from 604 to 554 nm where the original intensity can be recovered without external stimuli at room temperature [17]. Considering the different metal ions from group 11 have produced metal complexes with different metal-metal distance as a sensing site [18], we report the sensing capability of trinuclear group 11 metal trinuclear pyrazolate complexes from the same ligands for detection of ethanol vapors.…”

Systematic Study on Sensing Capability of Gold(I) Pyrazolate Complex for Vapochromic Chemosensors of Ethanol Vapors

“…Chemical sensors (chemosensors) of VOCs making use of the optical properties displayed by photoluminescent material have been extensively studied [6][7][8][9][10][11]. In this case, the detection relies on luminescent properties of chemosensors upon interaction with any analytes.…”