| 摘要 |
A naphthalocyanine derivative of formula (I): <CHEM> wherein k, l, m, and n are the same or different and each is zero or an integer of 1 to 4, k + l + m + n being an integer of 1 or more, each group R<1> is selected from alkyl, substituted alkyl or aryl and when there is more than one group R<1> these may be the same or different; M is Si, Ge or Sn; and the groups Y are the same or different and each is selected from halogen, hydroxy, aryloxy, alkoxy, trialkylsiloxy, triarylsiloxy, trialkoxysiloxy, triaryloxysiloxy, trialkoxysiloxy, triaryloxysiloxy, trityloxy and acyloxy has an excellent ability to absorb diode laser beans and is suitable for use in an optical recording medium. |
