Two polymorph modifications of BF2 complex of 1-phenyl-3-(3,5-dimethoxyphenyl)-propane-1,3 dione were prepared. In this molecule the two methoxy groups in one of the phenyl rings are at meta positions. In A polymorph they are away from each other (anti) while in polymorph B towards the other. In the crystal structure of both polymorphs molecules which are antiparallel form a stack through π-π interactions. Polymorph A in further stabilized with hydrogen bonds. Solid A exhibits mechano and thermochromic effect. Crystalline B polymorph undergoes phase transition into polymorph A. The prepared compound shows also solvatochromic effect.
COBISS.SI-ID: 1718063
A simple procedure was used to prepare stable SERS-active substrate. It is based on photoreduction of AgNO3 by ultraviolet light utilising hydroxypropyl cellulose as stabilising agent. Using a new substrate, it was possible to detect organic dye alizarin red S and two organic pigments, as well as organic colourants in paint layers, where different organic binders are also present. The investigated substrate shows promising characteristics for the analysis of cross sections of the samples. Better application control on the layer of interest is possible because of its viscosity.
COBISS.SI-ID: 513147947
The novel reaction system air/ammonium nitrate/iodine/hydrochloric acid [air/NH4NO3(cat.)/I2(cat.)/HCl] is introduced as a simple, safe, cheap, efficient and regioselective mediator for the α-chlorination of aryl, heteroaryl and alkyl methyl ketones under aerobic oxidative conditions. The inventive use of a catalytic amount of iodine enabled the moderate to quantitative, regioselective chlorination of a comprehensive scope of different methyl ketone derivatives including those bearing oxidizable heteroatom (S, N) substituents, some of which possess declared potential biological and pharmaceutical activity
COBISS.SI-ID: 27591463
The new method for aerobic oxidative iodination of organic compounds using reaction system air / ammonium nitrate (cat) /molecular iodine / H2SO4 (cat) was developed and used for selective and efficient iodination of activated aromatics and ketones at alpha to carbonyl position.
COBISS.SI-ID: 27879975