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The complexation of HA (or HB) with bivalent metals was examined by UV-Vis andNMR spectroscopy, and all of the complexes obtained have a metal-ligand ratio of 1:1.Thephotoinduced reduction of the complexes of HA-Zn~(2+) and HA Mg2+ (or HB-Zn~(2+), HB-Mg2+)in the presence of 1-benzyl-1,4-dihydro-nicotinamide as the electron donor was investigated byUV-Vis and ESR spectroscopy. The studies demonstrated that illumination of the complexes ofHA(HB)-Zn~(2+) and HA(HB)-Mg~(2+) led to the accumulation of the chelated semiquinone radicalanions.
The complexation of HA (or HB) with bivalent metals was examined by UV-Vis and NMR spectroscopy, and all of the complexes obtained have a metal-ligand ratio of 1: 1. The photoinduced reduction of the complexes of HA-Zn ~ (2+ ) and HA Mg 2+ (or HB-Zn 2+, HB-Mg 2+) in the presence of 1-benzyl-1,4-dihydro-nicotinamide as the electron donor was investigated by UV-Vis and ESR spectroscopy. that illumination of the complexes of HA (HB) -Zn ~ (2+) and HA (HB) -Mg ~ (2+) led to the accumulation of the chelated semiquinone radicalanions.