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In this review, we present a survey on the use of molecular nonlinear crystals in context terahertz (THz) photonics. The fundamentals optics for converting optical and infrared radiation into THz with basic theory femtosecond rectification difference frequency generation are described. Various types phase-matching conditions that can be achieved discussed. It is shown one unique features abilit...

Multiple fluorination of glycostructures has emerged as an attractive way modulating their protein affinity, metabolic stability, and lipophilicity. Here we described the synthesis a series mono-, di- trifluorinated N -acetyl-?-glucosamine ?-galactosamine analogs. The key intermediates are corresponding multiply fluorinated glucosazide galactosazide thioglycosides prepared from deoxyfluorinated...

Abstract In science education, learners’ conceptions of scientists and their work are often assessed by the Draw-A-Scientist Test (DAST). Due to validity concerns, methodical literature demands development alternative instruments measure validly efficiently. This study presents an instrument with 29 rating scale items assess pre-service teachers’ (PSTs) Views Scientists, Activities, Locations (...

A powerful method for the synthesis of 2-oxazolines from silyl-protected β-hydroxyamides is reported. Using diethylaminosulfur trifluoride (DAST) or its tetrafluoroborate salt (XtalFluor-E), silyl-protected β-amidoalcohols can be in situ deprotected and dehydrated to give 2-oxazolines in good yields. The utility of this approach was demonstrated by preparing the first reported oligomer of [2,4'...

We report for the first time to our knowledge optical waveguiding in an organic crystalline waveguide produced by ion implantation. Using H+ ions a refractive index barrier suitable for waveguiding has been realized in the highly nonlinear optical organic crystal 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST). The refractive index changes in the waveguiding region as a function ...