... Inorganic Chemistry ... Vol. ... absorption in the 1300-1450 cm-1 region, near 1440 cm.-l, and near 1500 and at 1600 cm-1 On hydrolysis of these compounds the absorptions at 1300-1450 and at 1500 cm.-l disappear, but those at 1600 cm.-l are retained where aromatic CH bonds ...