Synthesis and Characterization of Chlorine-methoxy-diphenylquinoline (Cl-MO-DPQ) and Chlorine-methyl-diphenylquinoline (Cl-M-DPQ) Blue Emitting Organic Phosphors

Abstract

New series of blue light emitting diphenylquinoline (DPQ) and its derivatives based on Chlorine-Methoxy (Cl-MO-DPQ) and Chlorine-Methyl (Cl-M-DPQ) were synthesized in Argon atmosphere at 140˚C by Friedlander condensation. These all samples were soluble in many organic solvents like Acetic acid, Formic acid, Dichloromethane etc. in different molar concentrations up to micro molar. It emits blue light in above solvents under UV source. All samples in different organic solvents were studied. Structural characterization was made by FTIR. Ultraviolet, fluorescence and excitation spectroscopy were used for analysis of photo physical properties. Thermal properties were characterized by TGA and SDTA. The derivatives Cl-MO-DPQ and Cl-M-DPQ show absorbance peaks in the range 264 -370 nm and 264 -338 nm respectively. In both the cases the emission spectra are in blue region. The TGA and SDTA studies show not only the DPQ but also it's derivatives have good thermal stability even though they are low molecular weight organic compounds, which may in turn improve the stability and operating lifetime of the device. The physical and chemical properties of these polymers are useful as a blue emitting organic material for OLED's.

Enzymatic synthesis of poly(catechin)-antibiotic conjugates: an antimicrobial approach for indwelling catheters

“…Afterwards, the coupling reaction of activated catechin with antibiotics was assessed, and consequently, some new peaks were observed such as the N-H bending vibration of primary amines around 1,650 cm −1 and the C-N stretching vibration of aliphatic amines in the region 1,140-1,080 cm −1 , both characteristic of the TMP structure. Moreover, the presence of methoxy (O-CH 3 ) group was identified by a small stretch peak at 2,940 cm −1 as well as by the methyl (C-H) vibrations at 1,460 cm −1 (Coates 2000;Stuart 2004;Zade et al 2011). Around 1,560-1,510 cm −1 , it was possible to observe the nonsymmetrical substitutional aromatic ring present on TMP with N as a substitutional atom (Franklin et al 2009;Ungurean et al 2013).…”

Experimental and Computational approaches to the molecular structure of Myristicin - a biologically active compound of Nutmeg

“…A methoxy subsititution is likely to show absorption peak at 270 nm. The Cl-M-DPQ in THF solution exhibits an absorption with a λ max at 270 nm, due to ππ* transition contributed by the methoxy conjugated quinoline back-bone 11 .Myristicin UV spectrum (fig 4) shows two significant peaks at 219 and 273 nm. The peaks are associated with vibrational effects on π→π* transitions in the allyl group and methoxy group.…”