Boron complexes of certain bis-heterocyclic compounds are provided. The complexes resemble monomethine cyanines and are useful for imparting fluorescent properties to materials by covalent and noncovalent association. The compounds have the following general formula: ##STR1##...http://www.google.de/patents/US6207464?utm_source=gb-gplus-sharePatent US6207464 - Rigidized monomethine cyanines
