Chromene compound

A chromene compound having a skeleton represented by the following formula (1):

• wherein Z is a group represented by any one of the following formulas:
• n is an integer of 1 to 3, when n is 2 or 3, Z's may be the same or different, with the proviso that when n is 1, Z cannot be —CH2— and when n is 2 or 3, Z's cannot be —CH2— at the same time;
• R1 is an electron absorbing group having a Hammett constant σp of more than 0, with the proviso that when there are a plurality of R1's, R1's may be the same or different;
• and X and Y are each independently an oxygen atom or a group represented by the following formula (2):
• wherein R2 is a hydrogen atom, hydroxyl group, alkyl group, haloalkyl group, alkenyl group, alkynyl group, cycloalkyl group, alkoxy group, aralkyl group, aralkoxy group, aryloxy group, aryl group, amino group, heterocyclic group having a nitrogen atom which is a cyclic membered hetero atom and is bonded to the nitrogen atom in the above formula (2), cyano group, nitro group, formyl group, hydroxycarbonyl group, alkylcarbonyl group, alkoxycarbonyl group or halogen atom, with the proviso that X and Y cannot be oxygen atoms at the same time.