| abstract |
PROBLEM TO BE SOLVED: To provide an ultraviolet absorber which is dissolved in silicone oil, transmits visible light and selectively absorbs ultraviolet rays, and has excellent transparency, a skin external preparation containing the same, and a new luminescent agent. The formula (I) or (II): M x R y (I) M x R yn Q n (II) (Wherein M is Si or Ge, R is H, OH or a solvent or surfactant, Q is a group that does not substantially affect the ultraviolet absorption capacity of the cluster, x, y and n) Each independently represents an average of 3 to 100 numbers.) The ultraviolet absorber which consists of a silicon | silicone or germanium cluster represented by Structural formula of these, or those derivatives, and the skin external preparation composition or luminescent agent containing them. .The |