Probing shapes of bichromophoric metal-organic complexes using ion mobility mass spectrometry

Ion mobility mass spectrometry (IM-MS) is used to probe the structure of three metal complexes carrying pendant chromospheres, the copper(II) complex Cu(DAC)(super 2+), theN-nitrosylated ligand DAC-NO and the Roussin's red salt ester (PPIX-RSE). The Cu complex exists as a single conformer, DAC-NO has two conformations and the PPIX-RSE structure exhibits two bent conformations with the planes of the porphyrin and the Fe2S2 rings at different angles with respect to each other.