Synthesis, crystal growth, thermal and spectroscopic studies of acentric materials constructed from aminopyridines and 4-nitrophenol

Abstract

a b s t r a c tA series of single Q2 co-crystals of non-centrosymmetric complexes of different mono-and diaminopyridines, namely 4-aminopyridine, 3,4-diaminopyridine, 2-amino-6-methylpyridine, 2,6-diaminopyridine, 2-aminopyridine, with 4-nitrophenol were grown by slow evaporation technique from solution at constant temperature. Optical transparency in the region of 300-1100 nm was found to be suitable for nonlinear optical applications with cut off wavelengths at 420-474 nm for these co-crystals. Single crystal X-ray analysis confirms the non-centrosymmetric packing. Thermogravimetric and differential thermal analysis shows good thermal stability of the studied compounds with melting point at range 99-172°C for different co-crystals. The second harmonic generation efficiency has been measured on single crystals by comparative SHG technique relative to KTP crystal. The nonlinear optical coefficient of the compounds was found to be up to 39 pm/V.

Unassisted formation of hemiaminal ether from 4-aminopyridine and o-vanillin - experimental and theoretical study

“…Quite recently, aminopyridine complexes with nitrophenol were reported to possess good optical properties, thermal stability, and suitability for optoelectronic devices [22,23].…”

Organic noncentrosymmetric complexes of 4-nitrophenol for second harmonic generation

“…The transmittance data, that are given below, at the UV-vis-NIR range of spectrum of these crystals were recorded with Shimadzu UV-1800 spectrophotometer in range 190-1100 nm and was published earlier 36 and discussed only slightly in this manuscript. Thermal characteristics studies were carried out in nitrogen atmosphere using Thermo Gravimetry/Differential Thermal Analyzer (TG/DTA) HITACHI STA7200.…”

“…Five co-crystals of 4-nitrophenol derivatives with different aminopyridines were grown successfully, with dimensional sizes from few millimeters (26MAP4N) to centimeters (26DAP4N; 2AP4N). UV-vis-NIR studies 36 show wide range of optical transmission for all co-crystals with cut off wavelengths at wavelength range 420-474 nm, which allow to use these crystals for second harmonic generation (SHG) of Nd:YAG lasers (532 nm). …”

Synthesis of 2,6-diaminopyridine-4-nitrophenol (2,6DAP4N) cocrystal nanoparticles by laser ablation method

“…Полностью отсутствуют исследования получения нелинейно-оптических молекулярных нанокристаллов методом лазерной абляции, что подтверждает целесообраз-ность проведения исследований в этой области. В настоящей работе приведены первые результаты ис-следований процессов абляции сокристалла 2.6-диаминопиридин-4-нитрофенол (26DAP4N), нового мо-лекулярного кристалла, нелинейно-оптические коэффициенты которого нами впервые исследованы в работе [8]. Получены наночастицы данного вещества и исследованы их оптические спектры в коллоид-ном растворе.…”

“…В данной работе в качестве испаряемого материала использовался органический сокристалл 2.6-диаминопиридин-4-нитрофенол (26DAP4N), изученный нами ранее в работе [8].…”