Metal complex type squarylium compounds and optical recording media made by using the same
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United States of America Patent
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Dec 9, 2003
Grant Date -
Oct 2, 2003
app pub date -
Nov 27, 2002
filing date -
Dec 20, 2000
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Expired
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Abstract
An object of the present invention is to provide a material having spectroscopic properties, light resistance, solubility and thermal decomposition properties suitable for recording for DVD-R. More specifically, the present invention provides squarylium compounds in a state of a metal complex represented by the general formula (I): ##STR1## wherein, R.sup.1 and R.sup.2 are the same or different, and represent an alkyl group optionally having a substituent, an aralkyl group optionally;,having a substituent, an aryl group optionally having a substituent, or a heterocyclic group optionally having a substituent; Q represents a metal atom with a coordination ability; q represents 2 or 3; and A represents an aryl group optionally having a substituent, a heterocyclic group optionally having a substituent, or Y.dbd.CH-- wherein Y represents an aryl group optionally having a substituent or a heterocyclic group optionally having a substituent.
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