2,2′-Dimethyl-4,4′-bipyridine

In the crystal structure of the title compound, C12H12N2, the mol­ecule is twisted around the central C—C bond, with a dihedral angle of 8.32 (5)° between the mean planes of the pyridyl rings. The crystal structure is stabilized by arene stacking inter­actions, with a distance of 3.81 (1) Å between the ring centroids

Rationale for ways to improve the operational model for calculating the parameters of the radar field

Проводиться огляд методів та моделей розрахунку параметрів зон виявлення РЛС РТВ. Пропонуються пропозиції щодо покращення якості оцінки параметрів радіолокаційного поля угруповання РТВ.Проводится обзор методов и моделей расчета параметров зон обнаружения РЛС РТВ. Предлагаются направления улучшения качества оценки параметров радиолокационного поля группировки РТВ.The review of methods and models for calculating the parameters of radar detection zones. The directions of improving the quality of estimation of the parameters of the radar field grouping

Self-assembly of nanoscopic coordination cages of D(3h) symmetry

A family of nanoscale-sized supramolecular cage compounds with a trigonal prismatic framework was prepared by means of spontaneous self-assembly from the combination of a predesigned molecular “clip” with tritopic pyridyl subunits. As confirmed by x-ray crystallography, the smallest structure of the reported series is ≈1 × 2 nm and possesses a nitrate anion incarcerated inside its molecular cavity. The largest structure has dimensions of ≈ 1 × 4 nm