Spiro compounds and their use
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United States of America Patent
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Nov 23, 2004
Grant Date -
Jun 19, 2003
app pub date -
Jul 26, 2002
filing date -
Mar 20, 1997
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Abstract
Spiro compounds of the formula (I), ##STR1## in which at least one of the radicals K.sup.1, L, M, N.sup.1, R.sup.1, R.sup.2, R.sup.3, R.sup.4 is one of the following groups ##STR2## ##STR3## are suitable as charge transport materials, in particular for photovoltaic cells, and as electroluminescence materials.
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