Spiro compounds and their use

   
   

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.

Os compostos de Spiro da fórmula (i), o ## do ## STR1 em que ao menos um dos radicais K.sup.1, L, M, N.sup.1, R.sup.1, R.sup.2, R.sup.3, R.sup.4 é um do seguinte ## do ## STR3 do ## do ## STR2 dos grupos são apropriados porque materiais do transporte da carga, no detalhe para pilhas photovoltaic, e como materiais do electroluminescence.

 
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