In crystals, adjacent Fe2+ and Ti4+ have a characteristic effect on this property. Heating alkali metal halides unusually changes this property by forming F-centers. A change in this property is produced by an equilibrium between a ring (15[1])opening and closing at the oxygen of a sultone or lactone in many (15[1])triarylmethane (15[1]-5[1])compounds. Point defects in lattices that change this property are called this property’s namesake (*) centers. In many compounds, this property is (-5[1])caused by charge-transfer (-5[1])bands. Electronic transitions between d orbitals confer this property to many coordination complexes of transition metals. A change in this property at the equivalence point marks the end of acid-base titration. (10[1])For 10 (10[1])points, name (10[2])this (10[1])property used (10[1])to show (10[1])the (10[5])pH of a (10[1])solution by indicators such as phenolphthalein. ■END■