Cyclotetraazocarbazole - a multichromic moleculeThis article is part of the ChemComm 'Emerging Investigators 2013' themed issue.Electronic supplementary information (ESI) available: Experimental procedures and analytical data; UV spectra of irradiation of 4 and 5. See DOI: 10.1039/c2cc37956b

A macrocyclic cyclotetraazocarbazole was prepared. Surprisingly, during the investigation of its photochromic behavior a drastic color change from yellow to green upon irradiation in chlorinated solvents was observed, which was temperature dependent and could also be induced by acid/base addition. With these three inputs an integrated molecular logic gate including an OR, a NOT and an AND function was build. A macrocyclic multiphotochromic cyclotetraazocarbazole is presented showing a distinct color change upon irradiation, pH-change or change of temperature.