ChemInform Abstract: Synthesis and Absorption Abilities of Pyrazolo[5,1‐c][1,2,4]triazine‐based Disperse Dyes.

Abstract

The solvent and acid‐base effects on the wavelength of maximum absorption of the title compounds is studied.

A study on optimum transition state and tautomeric structures of a bis-heterocyclic monoazo dye

“…To find out the optimized geometry of studied compound, all selected computed frequencies and proposed vibrational assignments together with IR intensity are listed in Table 2. Experimental stretching vibration values are also given in this table [23]. Assignments of selected vibrational modes obtained by using VEDA 4 program are also given in Table 2.…”

“…Results of these calculations are tabulated in Table 3. Experimental 1 H NMR chemical shift values [23] are also given in Table 3, but 13…”

“…Heterocyclic nature of thiophene ring has also provided an opportunity for perfect sublimation fastness on the dyed fibers [17][18][19]. In conjunction to such compounds, synthesis and spectral properties of some heterocyclic azo dyes have been reported [20][21][22]. Also, absorption abilities and tautomeric structures of some bis-heterocyclic monoazo dyes based on thiophene ring have been examined by some researchers [23].…”

“…m: stretching, d: bending, c: out of plane bending, s: torsion modes, Ar: aromatic, Me: methyl, Al: aliphatic, Pz: pyrazoline a Taken from Ref [23]. b Potential energy distribution (PED) of studied compound, less than 10 % are not shown Fig.4…”

“…Calculated wavelengths, excitation energies, oscillator strengths values for studied compound Taken from Ref [23]. using density functional theory (B3LYP) method at 6-31G (d) basis set level.…”