Figure 7:FT–IR spectra of drying of Ru(bpy)2(dcbpy)NHS. (a) 846.22 cm–1 band for the stretching vibration mode of =C–H bonds; (b) bands in 1223.61 cm–1 due to stretching vibration of –C–O bond; (c,d) the bands in 1710.64 cm–1 and 1777.78 cm–1 corresponding to –C=O groups.