10-Hydrazino-BODIPY, BoNHNH2 , presents slow rotation about the C10-NH bond that results in anisochronous 1 H and 13 C NMR signals. The assignment of different signals has been made using traditional two-dimensional methods as well spin-spin coupling constants confirmed by DFT calculations (B3LYP) 6-311++G(d,p) basis set. rotational barrier determined three pairs proton compared with calculated...