Novel Salts of 2,4-Diaminoquinazoline: Searching for Materials for Second Harmonic Generation Based on a Promising Polarizable Cation

Abstract

The chloride and L-tartrate salts of the 2,4-diaminoquinazolinium(1?) were prepared and characterized by both X-ray diffraction and infrared spectroscopy. The potential of the 2,4-diaminoquinazolinium(1?) cation as a building block for materials for nonlinear optics was assessed using quantum mechanical computations. Both 2,4-diaminoquinazolinium(1?) chloride dihydrate (a = 7.2121 (1) Å , b = 8.0105(2) Å , c = 18.6157(5) Å , b = 92.493(1)°, V = 1074.46(4) Å 3 , Z = 4, R = 0.0305 for 4605 observed reflections) and 2,4-diaminoquinazolinium(1?) L-tartrate dihydrate (a = 7.2899(2) Å , b = 11.9508(2) Å , c = 13.4 183(3) Å , b = 92.375(2)°, V = 1168.00(5) Å 3 , Z = 2, R = 0.0367 for 4761 observed reflections) belong to the monoclinic space group P2 1 . They are stable, nonhygroscopic, colorless and exhibit non-zero SHG efficiency for powdered samples.