Here we describe the preparation, characterisation, liquid crystal properties and photophysical studies of new potassium salts of tetrakis(β-diketonate)europium(III) complexes based on long-chained symmetrical and unsymmetrically substituted 1,3-dialkyloxyphenyl-β-diketones ligands, K[Eu(OO^R(n)R(m))₄] (R(n) = OC₆H₄OC_nH_2n+1; R(m) = OC₆H₄OC_mH_2m+1; n = m = 8, 10, 12, 14, 16; n = 4, 8, m = 12, 16; n = 12, m = 16). All compounds exhibit mesomorphic and luminescence behaviour, regardless the presence of symmetrical or unsymmetrical ligands. It has been shown that the shortest molecular lengths, established by the summation of the two alkyl chains at the substituents of the β-diketonate ligand, give rise to more effective mesophase transition temperatures, while the asymmetry favours higher clearing temperatures. Related to the ionic salts based on long-chained pirazolium cations [H₂pz^R(n)]⁺ (R(n) = OC₆H₄OC_nH_2n+1; n = 4, 6, 8, 10, 12, 14, 16, 18) and tetrakis(1,3-bis(methoxyphenyl)propane-1,3-dionate)europium(III) as anion, they have also been studied and proved to be luminescent materials. By contrast, none of them was found to be mesomorphic. Therefore, the strategically increased chain length at the cation did not show to be effective for achieving liquid crystal properties. Integration of one of these luminescent europium complexes onto a polymeric PMMA matrix was positively evaluated towards its use as a temperature sensor and fluoride or cyanide ion sensor.

在这里，我们描述了基于长链对称和不对称取代的1,3-二烷氧基苯基-β-二酮配体的四（β-二酮酸）op（III）配合物新钾盐的制备，表征，液晶性质和光物理研究， K [Eu（OO ^{R（n）R（m）}）₄ ]（R（n）= OC ₆ H ₄ OC _n H _{2n + 1} ; R（m）= OC ₆ H ₄ OC _m H _{2m + 1}; n = m = 8，10，12，14，16; n = 4，8，m = 12，16；n = 12，m = 16）。不论是否存在对称或不对称的配体，所有化合物均表现出介晶和发光行为。已经表明，由在β-二酮酸酯配体的取代基上的两个烷基链的总和建立的最短分子长度产生更有效的中间相转变温度，而不对称性则有利于更高的清除温度。与基于长链吡唑鎓阳离子[H ₂ pz ^R（n） ] ⁺（R（n）= OC ₆ H ₄ OC _n H _{2n + 1}的离子盐有关; n = 4、6、8、10、12、14、16、18）和四（1,3-双（甲氧基苯基）丙烷-1,3-二酸酯）eur（III）作为阴离子，它们也已进行了研究和被证明是发光材料。相反，没有发现它们是同构的。因此，策略性地增加阳离子上的链长并未显示出对实现液晶性质有效。积极评估了这些发光的onto络合物之一在聚合的PMMA基质上的集成，以作为其用作温度传感器和氟化物或氰化物离子传感器的用途。