... DOI: 10.1039/C3DT52129J (Paper) Dalton Trans., 2014, 43, 626-631. ... S2† shows the IR spectra of ZnP in the solid state and ZnP–M–A on the TiO 2 films in the region of 500–1300 cm −1 . The two characteristic signals, namely the so called in-plane pyrrole ring “breathing ...