基于苯并恶唑类化合物荧光猝灭的5—硝基巴比土酸光纤传感器的研制

基于５－硝基巴比土酸对增塑的ＰＶＣ膜中苯并恶唑类化合物的荧光猝灭作用，研制了测定水溶液中５－硝基巴比土酸的荧光光纤传感器。传感器具有重现性高，选择性，可逆性好，响应时间短，操作简便等特点，对５－硝基巴比土酸的检出限为９．５２×１０＾－７ｍｏｌ／Ｌ。     

对二甲氨基苯亚甲基染料的合成

根据Marder等[1]提出的键长变化理论,分子键长变化(BLA值)大约在0.003～0.005nm之间时β达到最大值,对于较早合成的多烯和花菁染料来说,BLA值太大(大于0.01nm),这是由于分子的吸电子基和给电子基对激发态的稳定不够或者由于分子从基态到激发态变化过程中失去芳香性.近来,不少人用低芳香稳定能的杂环来替代苯环已取得了较好的效果[2,3].目前人们对含硫代巴比土酸的分子的研究很多,而未注意到对含强吸电子基绕丹宁和海硫因分子的非线性光学性能研究.因此合成以绕丹宁、海硫因为吸电子基的染料分子并将其与含硫代巴比土酸的染料分子比较是有…     

基于苯并噁唑类化合物荧光猝灭的5-硝基巴比土酸光纤传感器的研制

基于５－硝基巴比土酸对增塑的ＰＶＣ膜中苯并噁唑类化合物的荧光猝灭作用，研制 了测定水溶液中５－硝基巴比土酸的荧光光纤传感器。传感器具有重现性高，选择性、可逆性 好，响应时间短，操作简便等特点，对５－硝基巴比土酸的检出限为９．５２ ×１０－７ｍｏｌ／Ｌ。将所研 制的传感器用于合成样品中５－硝基巴比土酸回收率的测定，结果令人满意。     

Theoretical Studies on Electronic Spectra and Second-order Nonlinear Optical Properties of Glucosyl Substituted Barbituric Acid Derivatives

AMI semi-empirical method was used to optimize the barbituric acid derivatives substituted with glucosyl B1-5 （series B）, and the thiobarbituric acid derivatives substituted with glucosyl T1-5 （series T）. Based on the optimized structures, INDO/CI method was adopted to calculate the electronic spectra. Meanwhile, the second-order nonlinear optical （NLO） coefficients βμ were calculated with the sum-over-state （SOS） formula. The results show that when the number of glucosyl units was increased, ｜βμ｜ values of the barbituric and thiobarbituric acid derivatives were both enhanced, especially for thiobarbituric acid derivatives. It indicates that non-conjugated substituted group could also improve NLO properties of materials when the number of repeated units was increased. Additionally, the absorption bands appearing in UV area are consistent with the proper change of the number of glucosyl units, and consequently it can be concluded that the high transparencies of all systems were scarcely varied.     

Uncatalyzed Condensation Reactions between Aromatic Aldehydes and Thiobarbituric Acid in Water

A series of 5-arylidene thiobarbituric acids were prepared from aromatic aldehydes and thiobarbituric acid in water without catalyst conditions in good yields. The structures were characterized by elemental analysis, IR and ^1H NMR spectra.     

拜耳（Baeyer，Johann Friedrich Wilhelm Adolf von．1835—1917）德国化学家（Chemist，Germany）

拜耳是普鲁士将军的儿子，母亲是犹太人。父亲对科学很感兴趣。他在海德堡向本生和凯库勒学习化学，1858年获得哲学博士学位。1863年他发现了用以制造安眠药的一种化合物巴比土酸。约30年之后，巴比土酸的化合物由费希尔进行了更详细的研究。1864年当霍夫曼回到德国时，拜耳在染料的研究上同他进行了竞争。他的学生格雷贝合成了茜素，他合成了靛蓝。1875年他应聘到慕尼黑大学去接替已去世的利比希。