| 摘要 |
<p>The use of conjugated cpds. contg. two or more pyrimidine rings as part of the conjugated system as electroluminescent materials is new. Also claimed are: (i) electroluminescent materials comprising one of these conjugated cpds., (ii) electroluminescent devices contg. an active layer of this material, (iii) pyrimidine cpds. of formula (I): R<1>-Fa-Db-Bc-Ad-Ce-Ef-Gg-R<2> (I) A = biphenyl-4,4'-diyl, anthracene-9,10-diyl, or a gp. of formula (II), pref. pyrimidine-2,5-diyl or 1,4-phenylene; X = O, -CH=CH-, CH=N- or -N=CH-; Y, Z = -CR<3>= or -N=; B, C = pyridine-2,5-diyl, pyridinium-1,4-diyl, pyridinium-2,5-diyl (N opt. substd. with 1-20C alkyl or opt. substd. phenyl) or -CR<4>=CR<5>, or pref. pyrimidine-2,5-diyl, 1,4-phenylene (0-2 H atoms replaced by R<3> gps.) or -CH=CH-; D, E = A, B, C, -B-A-C-, or gp. of formula (III)-(VII); F, G = pyridine-2,5-diyl, pyridinium-1,4-diyl, pyridinium-2,5-diyl (N opt. substd. with 1-20C alkyl or opt. substd. phenyl), 4-pyridyl, pref. D or E; R<1>-R<5> = H, 1-12C alkyl (opt. contg. one or more O linkages), -CN or -NR2<6>; R<6> = H, 1-6C alkyl or phenyl; a, c, d, e, g = 0-1; and b, f = 0-2, with the proviso that (a+b+c+d+e+f+g) is at least equal to 3, and gps. -Fa-Db-Bc-Ad-Ce-Ef-Gg contain≥2 pyrimidine-2,5-diyl gps., (iv) prepn. of 2,5'-bipyrimidine derivs. comprising reacting a 2-methyl pyrimidine with an enaminisation reagent, then reacting the enamine with a Vilsmeier-Haack reagent, and then reacting the opt. complex ion-pptd. vinamidinium salt with an amidine, and (v) prepn. of bis- or oligo-pyrimidine cpds. comprising reaction of a vinamidinium salt in an organic solvent with a (hetero)-arylene- bis(pertrimethylsilyl) carbamidine cpd. at 0-250 degrees C in the presence of a desilylation agent.</p> |
