PURPOSE: To provide a novel monochromatic compound having a sharp spectrum having narrow line widths, excellent in luminescent efficiency and photofunctions, and useful for luminescent articles, etc.

CONSTITUTION: A compound of formula I (A is aromatic hydrocarbon group, aromatic heterocyclic group; B is CH2CO, CH2CH2O, etc.; C* is aliphatic secondary amino, aromatic secondary amino, aliphatic secondary amino, etc.; D is H, substituent; (x) is 1, 2; C*-CO-CH2-O and B-O are coordination bond sites). For example, a compound of formula II. The compound of formula I is obtained by reacting a compound of formula III with a compound of formula IV (X is halogen) in the presence of a base such as sodium hydroxide in a solvent such as THF.