Heterocyclic compounds containing 4,6-bis-trichloromethyl-s-triazin-2-ly groups

A compound of formula I ##STR9## wherein L is a hydrogen atom, a phenyl radical or a substituent of the formula ##STR10## M is an alkylene radical or alkenylene radical or a 1,2-arylene radical comprising one, two or three benzene nuclei, M being unsubstituted or substituted by a member selected from the group consisting of a halogen atom, a carboxyl group, a sulfonic acid group, a nitro group, a cyano group, a carbonyl group, an alkyl group, an aryl group, an alkoxy group, a trifluoromethyl group, and an alkoxycarbonylalkyl group,

• Q is a sulfur, selenium or oxygen atom, a dialkylmethylene group, an alken-1,2-ylene radical, a 1,2-phenylene radical or an N-R.sup.1 group,
• with M+Q together forming 3 or 4 ring members,
• R.sup.1 is an alkyl, aralkyl, aryloxyalkyl or alkoxyalkyl radical,
• R.sup.2 and R.sup.3 differ from one another and are either a hydrogen atom or a 4,6-bis-trichloromethyl-s-triazin-2-yl group, and
• n is 0 or 1.