Patent ID: 7270770
Filing Date: 2007-09-18
Classification: C09K,F21K,G09F,Y10T

Abstract:
1. Compounds of formula I: wherein x is 1 or 2 M is selected from Europium, Terbium, Dysprosium and Samarium; R1, R2 and R3 are independently of each other selected from phenyl, naphthyl, H and C1-C6 branched or straight chain alkyl, thiophene and C1-C6 fluorinated alkyl wherein the fluorination may be in 1 or all positions or any intermediate value, substituted phenyl wherein the substituents are independently selected from C1-C4 straight or branched chain alkyl, Cl, Br, F, I and the phenyl group may be substituted in 1, 2 or 3 positions; R4 and R5 are independently of each other selected from phenyl, tolyl, naphthyl, C1-C6 branched or straight chain alkyl and substituted phenyl wherein the substituents are independently selected from C1-C4 straight or branched chain alkyl and the phenyl group may be substituted in 1, 2 or 3 positions; R6 is selected from C1-C6 branched or straight chain alkyl and —(CH provided that when R4, R5, R7 and R8 are all selected from phenyl then X is 2 or R2 is other than H.