Synthesis and Crystal Structure of a Novel Self-assembled1,4-dimethyl Cucurbituril Silver(I) Complex

Crystals of a new 1,4-dimethyl cucurbituril(TMeQ6) with Silver(I) ion were synthesized, and the structure was determined by X-ray diffraction technique. There are two kinds of TMeQ6 A and B which formed molecular encapsulates with two silver ion lids in the self-assembled entities. One dimensional supramolecular tubes are formed from the encapsulates A, and two dimensional molecular sieves are formed from the encapsulates B, the tubes and the sieves stack together alternately in the self-assembled entities. CCDC: 271401.国家自然科学基金资助项目(No.20362003);; 科技部国际科技合作重点项目计划(No.2003DF000030);; 贵州省省长资金项目;; 贵州省国际科技合作重点项目计划(No.2005400101

A Molecular Bowl with Barium Ion As Bottom

A molecular bowl with barium ion covering one portal of decamethylcucurbit[5]uril as a‘metal-ion- bottom’has been synthesized. The structure of the molecular bowl has been confirmed by the single crystal X-ray diffraction determination. It belongs to orthorhombic with space group of Pna21. The crystal unit cell parameters are: a=3.2108(6) nm, b=1.4742(3) nm, c=1.1516(2) nm, and V=5.4509(18) nm3, Dc=1.677 Mg·m-3, Z=4, F(000)= 2832, R=0.0551, wR=0.1568. CCDC: 290552.国家自然科学基金资助项目(No.20362003);; 科技部国际科技合作重点项目计划(No.2003DF000030);; 贵州省省长资金项目;; 贵州省国际科技合作重点项目计划(No.2005400101)

Study of the Interaction of Disubstituted Cucurbit[6]uril with 2-(Aminomethyl)pyridine

分别用核磁共振、紫外可见吸收和X射线单晶衍射方法研究对称四甲基六元瓜环与2-氨基甲基吡啶的相互作用及其结构特征.1HNMR谱图和紫外可见吸收光谱图清晰表明,2-氨基甲基吡啶与对称四甲基六元瓜环有明显的相互作用,客体2-氨基甲基吡啶的吡啶环部分进入了瓜环空腔,1HNMR谱图相关质子峰的积分强度以及客体吸光度随主体瓜环浓度变化明确表示它们之间形成了1∶1的包结配合物,此包结比并不随瓜环的浓度增加而改变.X射线单晶衍射法对包结配合物晶体的测定进一步证实了核磁共振、紫外可见吸收方法所得结论.Interaction and structure of a host-guest inclusion complex of symmetrical tetramethyl substi- tuted cucurbit[6]uril (TMeQ[6]) with 2-(aminomethyl)pyridine (amp) have been studied by using 1H NMR technique, UV-visible spectrophotometry and single crystal X-ray diffraction determination. The experimen- tal results from 1H NMR and UV-visible spectra revealed that the amp as a guest enters into the cavity of TMeQ[6] to form a host-guest inclusion complex of TMeQ[6] and amp with a constant ratio of 1∶1. The single crystal X-ray diffraction determination further confirmed the conclusions.国家自然科学基金(Nos.200261002,20362003);; 科技部国际科技合作重点计划(No.2003DF000030);; 贵州省省长资金;; 贵州省教育厅自然科学研究资助项目

The Difference of Luminous Performance Between Traditional Phosphor Packaging LED and Remote Phosphor LED

研究了传统白光lEd与蓝光激发的球冠形远程荧光粉白光lEd在不同电流、不同热沉温度下的发光性能,并对其机理差异展开了探讨。实验结果表明:随热沉温度和驱动电流的上升,传统白光lEd的量子效率和电光转换效率急剧下降,并导致其y/b比(yEllOW/bluE rATIO)下降,相关色温上升。而在远程荧光粉白光lEd中,其量子效率、光转换效率和相关色温在相同实验条件下变化幅度都较小。由光强空间分布和y/b比空间分布可知,远程荧光粉白光lEd的光强分布呈类似蝠翼分布,且y/b比空间均匀性远大于传统白光lEd。Under different drive current and heat sink temperature,luminous performances as well as physical mechanisms were studied for both traditional phosphor-dispensing packaging white LED and blue light-converting hemisphere remote phosphor LEDs.With the increase of the heat sink temperature and the drive currents,the quantum efficiency and light conversion efficiency in the traditional phosphor-dispensing packaging white LED drop rapidly,which is responsible for the decrease of Y/B ratio(Yellow/Blue Ratio) and the apparent increase of CCT(correlated color temperature).However,the parameters of quantum efficiency,light conversion efficiency and CCT in blue light-converting hemisphere remote-phosphor packaging LEDs have little change under the same experimental conditions.In addition,the remote phosphor LEDs exhibit a batwing spatial luminous intensity distribution and the spatial Y/B ratio distribution is much more homogeneous compared with the traditional phosphor-dispensing packaging white LED.国家自然科学基金(11104230;61102030); 福建省产学研重大科技项目(2011H6025;2013H6024); 福建省重点科技项目(2012H0039)资

A molecular bowl with barium ion as bottom

A molecular bowl with barium ion covering one portal of decamethylcucurbit[5]uril as a 'metal-ion-bottom' has been synthesized. The structure of the molecular bowl has been confirmed by the single crystal X-ray diffraction determination. It belongs to orthorhombic with space group of Pna2(1). The crystal unit cell parameters are: a=3.2108(6) nm, b=1.4742(3) nm, c=1.151 6(2) run, and V=5.4509(18) nm(3), D-c=1.677 Mg(.)m(3), Z=4, F(000)= 2832, R=0.0551, wR=0.1568

Synthesis and crystal structure of a novel self-assembled 1,4-dimethyl cucurbituril Silver(I) complex

Crystals of a new 1,4-dimethyl cucurbituril (TMeQ [6]) with Silver(I) ion were synthesized, and the structure was determined by X-ray diffraction technique. There are two kinds of TMeQ[6] A and B which formed molecular encapsulates with two silver ion lids in the self-assembled entities. One dimensional supramolecular tubes are formed from the encapsulates A, and two dimensional molecular sieves are formed from the encapsulates B, the tubes and the sieves stack together alternately in the self-assembled entities

对称四取代六元瓜环的合成及其2,2-联吡啶主客体化合物

利用二甲基取代甘脲的二醚与甘脲二聚体成功合成了新型取代六元瓜环——对称四甲基六元瓜环. 该瓜环的结构已被晶体结构鉴定、核磁共振谱以及质谱方法所证实, 分子中所含两个二甲基取代甘脲处于对位. 1H NMR表明该瓜环容易与吡啶衍生物形成主客体配合物

Study of the interaction of disubstituted cucurbit[6]uril with 2-(aminomethyl)pyridine

Interaction and structure of a host-guest inclusion complex of symmetrical tetramethyl substituted cucurbit[6]uril (TMeQ[6]) with 2-(aminomethyl)pyridine (amp) have been studied by using H-1 NMR technique, UV-visible spectrophotometry and single crystal X-ray diffraction determination. The experimental results from H-1 NMR and UV-visible spectra revealed that the amp as a guest enters into the cavity of TMeQ[6] to form a host-guest inclusion complex of TMeQ[6] and amp with a constant ratio of 1:1. The single crystal X-ray diffraction determination further confirmed the conclusions

Synthesis and crystal structure of a novel self-assembled (1,4-discyclohexyl cucurbituril) sodium(I) complex

A novel complex of a new 1,4-dicyclohexyl cucurbituril(DCYQ[6]) with sodium(I) ion was synthesized, and the crystal structure was determined by X-ray diffraction technique. In this self-assembled entity both the cavity interaction of DCYQ[6] included a nitrate anion and the portal interaction of the dipole carbonyls of DCYQ [6] with sodium cations lead to form self assembled molecular capsules. The crystal structure of the entity shows a packing of the self assembled molecular capsules connected by hydrogen bonds of water molecules