| 摘要 |
PURPOSE:To enable the nondestructive optical writing and readout of informa tion by using a complex of a transition metal selected among specified compounds as at least one between an electron donative substance and an electron accepting substance. CONSTITUTION:A complex of a transition metal capable of producing a mixed valence state and represented by formula I, II or III is used as at least one between an electron donative substance and an electron accepting substance. In the formulae I-III, Z is O, S or NR (R is H or alkyl), each of X and X' is H, alkyl or the like, Z' is S or NR (R is H or alkyl), Y is H, alkyl or the like, m is an integer of +2--2, A is an anion, a cation or a group of anions or cations having electric charges required to neutralize electric charges defined by m, and M is an ion of a transition metal. Thus, light for readout can be completely distinguished from light for writing, so destructive readout is avoided in principle. |
