Spiro compounds and the use thereof
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United States of America Patent
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Apr 3, 2001
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N/A
app pub date -
Jan 3, 2000
filing date -
Mar 20, 1997
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Abstract
Spiro compounds of the formula (I), ##STR1## where X.sup.1, X.sup.2, X.sup.3, X.sup.4 are identical or different and are --S--, --O--, --NR.sup.5 --, --CR.sup.5.dbd.N-- or --CR.sup.5.dbd.CH--, with the proviso that at least one of the groups X.sup.1-4 is different from --CR.sup.5.dbd.CH--, are suitable as charge transport materials, in particular for photovoltaic cells, and as electroluminescence materials.
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