1,3,5-Triaryl-2-pyrazoline derivatives with a pyridine ring in position 1 and 2-benzimidazolyl or 2-benzothiazolyl bicycles 3 were synthesized. Spectral properties solvents of similar polarity, i.e. aprotic acetonitrile protic methanol, studied, complexation cadmium mercury ions was elucidated as well. Quantum-chemical modeling application the elements Bader's atoms-in-molecules (AIM) theory ti...