One-pot three-component tandem reaction: Synthesis of aryl/alkyl cyanamides libraries and their further conversion into tetrazole derivatives

We have developed methodology for the synthesis of aryl/alkyl cyanamides from amines in one-pot four steps reaction using cheap, readily available and air stable copper source as catalyst under mild reaction conditions. We have also studied the application of cyanamides. In this connection, we could construct aryl tetrazolamine from cyanamides using click reaction     

Facile,Quick, and Gram‐Scale Synthesis of Ultralong‐Lifetime Room‐Temperature‐Phosphorescent Carbon Dots by Microwave Irradiation

Long‐lifetime room‐temperature phosphorescence (RTP) materials are important for many applications, but they are highly challenging materials owing to the spin‐forbidden nature of triplet exciton transitions. Herein, a facile, quick and gram‐scale method for the preparation of ultralong RTP (URTP) carbon dots (CDs) was developed via microwave‐assisted heating of ethanolamine and phosphoric acid aqueous solution. The CDs exhibit the longest RTP lifetime, 1.46 s (more than 10 s to naked eye) for CDs‐based materials to date. The doping of N and P elements is critical for the URTP which is considered to be favored by a n→π* transition facilitating intersystem crossing (ISC) for effectively populating triplet excitons. In addition, possibilities of formation of hydrogen bonds in the interior of the CDs may also play a significant role in producing RTP. Potential applications of the URTP CDs in the fields of anti‐counterfeiting and information protection are proposed and demonstrated.     

α-环糊精修饰有机聚合物整体材料选择性富集室温磷光法测定土壤中的萘

合成了α-环糊精（α-CD）修饰的有机聚合整体材料,对合成的材料进行了表征,研究比较了α-CD修饰整体材料作为室温磷光固体基质的效果以及14种有机化合物在其上的室温磷光分析(RTP)行为。 α-CD修饰的有机聚合整体材料背景干扰低, 对二环芳烃类物质有较好的选择性和富集能力。 在α-CD修饰膜上,萘和7,8苯并喹啉的分配常数分别为5.03×103和2.94×102,表明修饰材料对萘有较好的选择性。 萘酚也能与修饰材料形成包络物。 但是由于较强的极性和在水中的溶解性,不能被有效富集。 对5.0×10-11 mol/mL萘,最大富集体积为300 mL。 采用SPE-RTP,萘和7,8苯并喹啉的检出限分别为9.80×10-12和4.60×10-11 mol/mL,RSD小于3.7%;线性范围分别为5.00×10-11~8.00×10-9 mol/mL和6.00×10-11~5.00×10-10 mol/mL。 应用修饰的膜片对土样中的萘进行选择性富集和测定,结果由GC-MS进一步确认。 用环己烷一步提取和SPE-RTP测定,萘可以被选择性富集。 在土壤样品中加萘标准0.012 8 mg,测得回收率（104.9±6.5）%。 土样中萘的浓度为（5.61±0.12） mg/kg,与GC-MS的较为吻合。     

Recent progress on pure organic room temperature phosphorescence materials based on host-guest interactions

Pure organic room temperature phosphorescence (RTP) has been attracting a lot interest recently. So far, many strategies have succeeded in achieving efficient organic RTP materials by increasing the rate of intersystem crossing (ISC) and suppressing non-radiative transitions. In supramolecular chemistry, the control and regulation of molecular recognition based on the role of the host and guest in supramolecular polymers matrix, has attracted much attention. Recently, researchers have successfully achieved room temperature phosphorescence of pure organic complexes through host-guest interactions. The host molecule specifically includes the phosphorescent guest to reduce non-radiative transitions and enhance room temperature phosphorescence emission. This review aims to describe the developments and achievements of pure organic room temperature phosphorescence systems through the mechanism of host-guest interactions in recent years, and demonstrates the exploration and pursuit of phosphorescent materials of researchers in different fields.     

室温下合成纺锤形貌六方相NaLnF_4(Ln=Nd,Sm,Eu,Gd,Tb)纳米颗粒

室温下合成长250nm,宽100nm的纺锤形貌六方相的NaNdF4。NaEuF4,NaSmF4,NaGdF4和NaTbF4也用同样的方法获得。产物用XRD,TEM,HRTEM,FESEM和PL进行表征。PL光谱显示合成的NaEuF4的激发波长是394nm。NaEuF4有4个特征发射谱带,分别是591,615,650和681nm。     

稀土奥贝蠕铁制取工艺及其性能的研究

稀土奥贝蠕铁可用含稀土的蠕化剂及等温淬火工艺稳定地制取,藉助高温扫描电子显微镜,观察并研究了稀土蠕铁奥氏体化过程及稀土奥贝蠕铁随温度升高时组织的变化。用带有加热装置的万能材料试验等土奥贝蠕铁的各种性能进行了系统测定了如抗拉强度、延伸率、冲吉韧性、热膨胀系数及伸长百分率,结果表明,稀土奥贝蠕铁在室温和高温下均有良好的性能。     

SO4 2−/SnO2: Efficient,Chemoselective, and Reusable Catalyst for Acylation of Alcohols,Phenols, and Amines at Room Temperature

Abstract

SO₄ ^2?/SnO₂ was employed for the acylation of a variety of alcohols, phenols, and amines under solvent‐free conditions at room temperature. This method showed preferential selectivity for acetylation of the amino group in the presence of a hydroxyl group. The reported method is simple, mild, and environmentally viable, using several other acid anhydrides at room temperature.     

金属钯/铂卟啉室温燐光探针在生物医学领域的应用研究

钯 铂 卟啉络合物在室温下发射长寿命 (ms)、长波长的光 ,这些特点使其在生物分析方面成为有用的探针。本文综述了该探针在光免疫标记、肿瘤诊断、DNA测定、生物传感器及其它方面的研究进展。引用文献 4 3篇