Isomerization of p,p′-Diiodoazobenzene Controlled by the Surface Plasmon-Assisted Reaction

Abstract

Based on a SERS study, the plasmon-assisted coupling reaction of p -iodoaniline (PIAN) to p , p ′-diiodoazobenzene was investigated. This model plasmon-assisted reaction exhibits an outstanding SERS performance with the limit of detection as low as 10 –13 M. Under low concentrations, the control of the cis – trans isomerization of p , p ′-diiodoazobenzene was achieved by characterizing the Raman peak intensity at 1432 cm –1 of the coupling reaction catalytic product. We present the regulation strategy for the isomerization of azobenzene derivatives enabled here, through the controlled adjustment of reactant concentration, and expand the application of SERS technique.

Oxidative Molecular Layer Deposition of Amine-Containing Conjugated Polymer Thin Films

“…To examine this, we performed Raman spectroscopy on both Py/MoCl 5 and Ani/MoCl 5 oMLD films, as depicted in Figure a–c and compared these against reference spectra for pPy and pAni. The Raman peaks for the Py/MoCl 5 oMLD film are all consistent with the peaks expected for pPy, as depicted in Figure a. , Although Ani/MoCl 5 oMLD Raman measurements reveal characteristic peaks for pAni in Figure b, we also observe a clear peak at 1480 cm –1 in the Ani/MoCl 5 Raman spectrum that is consistent with the azo (R–NN–R) group in azobenzene. , Unfortunately, the remainder of the Raman peaks for azobenzene overlap with peaks expected for pAni, except for strong peaks at 1575 and 1580 cm –1 , , and these two peaks overlap with a peak from the PGS substrate employed in Figure b. To confirm the presence of azobenzene, we performed Raman spectroscopy on an Ani/MoCl 5 oMLD film deposited on an anodic aluminum oxide (AAO) substrate in Figure c, where the AAO substrate does not interfere with peaks at 1575 and 1580 cm –1 .…”

Efficient phosphate removal utilizing N, Zn-doped carbon dots as an innovative nanoadsorbent

“…are important sources of the pollutant PO 4 3− in the environment. 1,2 Environmental PO 4 3− abundance can be detrimental to humans, leading to kidney damage and osteoporosis. 2 Increasing PO 4 3− concentration in surface water promotes the growth of phosphate-dependent species such as algae and duckweed.…”

“…1,2 Environmental PO 4 3− abundance can be detrimental to humans, leading to kidney damage and osteoporosis. 2 Increasing PO 4 3− concentration in surface water promotes the growth of phosphate-dependent species such as algae and duckweed. 3 These organisms consume a lot of oxygen and keep sunlight out of the water.…”

“…This phenomenon is oen referred to as eutrophication. 2,3 Such conditions result in the demise of aquatic life, the production of odors, and the proliferation of harmful organisms. 3 Total PO 4 3− can range from 8.5 mg L −1 in landll leachate to 740 mg L −1 in fresh urine, according to data found in the literature.…”

“…3 Total PO 4 3− can range from 8.5 mg L −1 in landll leachate to 740 mg L −1 in fresh urine, according to data found in the literature. 1,2 In addition, the recommended levels of total PO 4 3− in streams that reach lakes and owing bodies of water are 0.05 and 0.1 mg L −1 , respectively. [1][2][3] Recovering PO 4 3− from aqueous environments could reduce these issues.…”