Preparation of semiconductors for gas sensors consists of cyclotetramerisation of a substituted dinitrile in the presence of a transition metal salt

摘要

The preparation of semiconductors (I) for gas sensors comprises reaction of a substituted dinitrile in the presence of a bivalent transition metal salt of general formula MX2 or MX. EMBODIMENT: The products are metallo phthalo cyanines with sulphur functions.