摘要
研究了铕 (Ⅲ )和噻吩甲酰三氟丙酮 (HTTA)形成的有机配合物与苯乙烯 丙烯酸共聚物 (PSAA)在不同pH值时发生配位反应得到配位聚合物NaEu(Ⅲ ) TTA PSAA的 3种样品 (a)、(b)、(c) .红外光谱、紫外光谱、X光电子能谱、DTA TG等测试手段证实Eu3+ 分别与PSAA、TTA- 发生配位 .元素分析和电导率测定结果证明了配位组成和结构在不同的pH条件下发生变化 .结果表明 ,配合物试样 (a)、(b)、(c)中Eu3+ 的含量分别为11 89%、12 5 5 %和 13 4 1% .由于配合物中存在着Eu3+ 分别与TTA- 和PSAA分子中羧基的配位作用并进一步交联 ,因此配合物样品均不溶于大部分有机溶剂 ,只能溶于N ,N 二甲基甲酰胺和丙三醇和异丙醇的混合溶剂 ,而且耐热性能均提高 .该配合物均是褐色固体 .荧光光谱表明 ,样品在常温、紫外光下发出强的红光 ,主要是Eu离子的5D0 →7F2 的跃迁 .讨论了溶剂、pH值对配合物荧光强度的影响 .当pH =10时 ,合成的配合物有最好的荧光性质 .
Three (a),(b),(c) samples of luminescent Eu containing copolymer (NaEu(Ⅲ) TTA PSAA) was synthesized through the reaction of copolymer of acrylic acid and styrene (PSAA, M w=3000) with metalorganic complex(NaEu(TTA) 4),which was obtained between Eu and thienyltrifluroacetone.These samples of coordination polymers were characterized by FT IR,UV,XPS and DTA TG,and its composition and their structure were determinated.The result of electrical conductivity methods and elemental analysis indicated that there were different compositions and structures of these coordination polymers in different pH.The results of elemental analysis show that the content of Eu 3+ in sample (a),(b),(c) was 11 89%,12 55% and 13 41% respectively.It was ascertained in these coordination polymers each Eu 3+ is coordinated by TTA - ion and carboxyl in the PSAA molecule,making these coordination polymers cross link further.As a result,these coordination polymers,which are insoluble in most orgainc solvents and higher thermal resistance,are brown solids.But it can be soluble in N,N dimethylformamide and the mixed solvent of glycerol alcohol and isopropanol.The coordination polymer exhibited intense red light at 615?nm under UV excitation at room temperature,which is attributed to the 5D 0→ 7F 2 transition of Eu(Ⅲ) ions.The effects of solvents and pH on the fluorescence intensity were investigated.The fluorescence spectrum indicated that the coordination polymer has good fluorescence properties as pH=10 0.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2002年第4期479-486,共8页
Acta Polymerica Sinica
基金
福建省自然科学基金资助 (基金号E9910 0 16)
