Type 8 isoquinoliniumzwitterions were synthesised by the reaction of type 1 diketones or type 2 pyrylium salts with different 5-amino-3-Q-1H-1,2,4-triazoles. Spectroscopic and X-ray diffraction evidence was given for the zwitterion structure of the products obtained. The position of the negative charge on the 1,2,4-tiazolium ring was proved by comparison of the cmr and uv spectra of the products