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碳笼化合物的高效液相色谱研究 总被引:3,自引:0,他引:3
采用化学键合固定相(DNAP-SP)及二元混合流动相(50%苯-正已烷),对碳笼化合物C60与C70的高效液相色谱(HPLC)分析及分离进行了研究。比较了多种流动相对C60、C70分离效果的影响,苯/正已烷混合体系是最好的流动相。 相似文献
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C_(60)、C_(70)与过氧苯甲酰反应的动力学研究胡波,薛万华,张法义,尚振锋,马克勤,臧雅茹,赵学庄(南开大学化学系,天津,300071)关键词C_(60),C_(70),动力学Kratschmer等人[1]的发现使制备宏观量的C(60)和C(70... 相似文献
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C60和C70的分子及晶体结构 总被引:1,自引:0,他引:1
本文较详细地介绍了C60、C70的各种光谱、波谱、X射线衍射结果及C60、C70单晶体的培养方法,说明了C60、C70的分子构型及晶体结构和相变特点。 相似文献
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本实验采用金属有机化学方法成功地将富勒烯分子引子到PNVC侧链形成CBP型共聚功能材料,研究了其UV-VIs谱行为。结果表明,C60或C60/C70混合物化学修饰的产物其紫外可见谱明显向长波方向移动,谱峰范围由280nm扩展至870nm。 相似文献
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球烯-C_(60)和C_(70)的纸制模型曹玲华,刘育亭(新疆大学化学系830046)球烯-C60和C70是具有固定组成和特殊结构的碳素多面体原子簇,是继金刚石和石墨之后,新发现的碳的同素异形体[1,2]。由于它特殊的结构和形态,已引起人们高度的重视。... 相似文献
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C_(70)正负离子的激光引发聚合刘朝阳,王春儒,黄荣彬,林逢辰,郑兰荪(固体表面物理化学国家重点实验室,厦门大学化学系,厦门,361005)关键词C_(70),聚合,激光等离子体C60在激光作用下的进一步聚合是近来在C60研究中的又一重要发现,Yer... 相似文献
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含水溶性碳笼烯的水凝胶陈立桅郑磊洪瀚李子臣周锡煌李福绵(北京大学化学系北京100871)关键词水溶性碳笼烯,水凝胶,超氧负离子随着碳笼烯(C60,C70,fulerenes)的简便制取方法[1]的问世,其应用,特别是其材料化自然被提到日程上来.... 相似文献
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本文用量化学及分子力学方法计算了(Na@C60)及(Cl@C60)中Na及Cl与C60之间的相互作用,总的相互作用是吸引。在静电相互作用、色散相互作用及电子云重排斥相互作用三项中前一项占90%以上,有着决定性的影响,色散相互作用约占5%。对电子云重叠排斥作用来说,由于Cl^-的半径比Na^+的大很多,所以在(Cl@C60)中这种作用要比在(Na@C60)中大很多。 相似文献
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Dr. Jan Ulč Jaroslav Jacko Dr. Ivana Císařová Prof. Lubomír Pospíšil Dr. David Nečas Prof. Dr. Martin Kotora 《European journal of organic chemistry》2023,26(18):e202300153
Herein, we report the design and synthesis of a series of novel cationic nitrogen-embedded polyaromatic hydrocarbons with a planar geometry. The synthetic pathway is based on catalytic C−C/C−H bond activation relay that enabled preparation of regioselectively 5,6,10,11-tetrasubstituted naphtho[2,1,8-ija]quinolizinium salts bearing various types of substituents. Single-crystal X-ray analyses of selected compounds confirmed planarity of the quinolizinium core. Most of the prepared compounds exhibited strong fluorescence (Φs up to >99 %) ranging from 420–600 nm depending on the substitution pattern. According to DFT calculations LUMO is always distributed over the quinolizinium framework regardless of the attached substituents, whereas delocalization of HOMO is related to the substitution pattern. Electrochemical measurements show irreversible reduction of all compounds, which is supported by the calculated location of LUMO orbitals. 相似文献
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碳碳双键催化加氢的研究进展 总被引:1,自引:0,他引:1
综述了近年来碳碳双键催化加氢的研究进展;分别针对以氢气为氢源的催化加氢反应和以非氢气为氢源的催化转移加氢反应进行了分析概括;指出其中催化转移加氢(包括光照下转移加氢)具有反应条件温和且操作安全简便的优势,应用前景广阔. 相似文献
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C12-s-C12·2Br和C12En混合水溶液的胶团化行为 总被引:1,自引:0,他引:1
季铵盐二聚表面活性剂C12-s-C12@2Br(s=2、3、4、6)和非离子表面活性剂C12E10或C12E23在水溶液中生成混合胶团.其临界胶团总浓度cmcT值介于二元复配体系中各组分的临界胶团浓度和之间.当添加少量非离子型表面活性剂(在水溶液中的摩尔分数α2=0.1)时,混合胶团中C12E10或C12E23的摩尔分数均已超过0.35;随着溶液中非离子型表面活性剂含量的增大,混合胶团中逐渐以C12E10或C12E23成分为主. 相似文献
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Dr. Ze-Hua Wu Dr. Artem Skabeev Prof. Dr. Yulian Zagranyarski Dr. Ruomeng Duan Prof. Dr. Jun-O Jin Prof. Dr. Minseok Kwak Prof. Dr. Thomas Basché Prof. Dr. Klaus Müllen Dr. Chen Li 《Angewandte Chemie (International ed. in English)》2023,62(52):e202315156
A new class of near-infrared (NIR) fluorophores, PAI , is obtained by consecutive C−N/C−C bond formation between diphenylamines and 9,10-dibromoperylenecarboximide. Owing to the rigid structure, extended π-conjugation and pronounced push-pull substitution, these fluorophores show emission maxima up to 804 nm and large Stokes shifts. The extraordinarily high fluorescence quantum yields from 47 % to 70 % are attributed to chloro substitution in the bay positions of the perylene core. These characteristics, together with high photostability, qualify them as useful NIR emitters for applications as biomarkers and security inks. 相似文献
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In the crystal structure of 1, pairs of molecules are connected by mutual C(Cp)–H?CC interactions which have a geometry suggestive of weak hydrogen bonding (1[(η5-C5H5)Fe(CC−C7H7–2,4,6)(CO)2]). The shorter of the H?C distances is only 2.59 Å, which is a distance that is typically observed for C–H?CC hydrogen bonds of stronger donors such as chloroform or alkyne groups. 相似文献
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Jin‐Quan Chen Xiang‐Jun Xin Peng‐Dong Fan Jia‐Lun Ping 《International journal of quantum chemistry》1999,73(3):283-297
Using the symmetrized boson representation technique, concise algebraic expressions of the irreducible bases symmetry adapted to the group chain Ih⊃C5 for the fullerene molecules C20H20, C80, and C240 are derived for the most general cases and those for any specific case can be derived from them easily without a projection procedure. ©1999 John Wiley & Sons, Inc. Int J Quant Chem 73: 283–297, 1999 相似文献
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Energy differences, ΔXS‐t (X = E, H and G) (ΔXS‐t = X(singlet)‐X(triplet)) between singlet (s) and triplet (t) states are calculated at B3LYP/6‐311++G (3df,2p). The DFT calculations show that the triplet state of C4H4C is a ground state with planar conformer respect to its corresponding nonplanar singlet state. Both singlet and triplet states of C4H4M (M = Si, Ge, Sn and Pb) have a planar conformer with the singlet ground state. Four isodesmic reactions are presented for determining the stability energies, SE. NICS calculations are carried out for C4H4M to determine the aromatic character. 相似文献
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Xin-Yang Lv Roman Abrams Prof. Ruben Martin 《Angewandte Chemie (International ed. in English)》2023,62(8):e202217386
Herein, we describe the development of a copper-catalyzed C(sp3)-amination of proaromatic dihydroquinazolinones derived from ketones. The reaction is enabled by the intermediacy of open-shell species arising from homolytic C−C bond-cleavage driven by aromatization. The protocol is characterized by its operational simplicity and generality, including chemical diversification of advanced intermediates. 相似文献
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Microwave-assisted extraction (MAE) was examined as an alternative to the traditional Soxhlet method of extracting C60 and C70 from fullerene soot. MAE of 0.20 g of fullerene soot with 95:5 toluene–acetonitrile yielded greater than 7.8 mg of C60 and greater than 0.54 mg of C70 in 4 min with no further increase in yield after 30 min of irradiation. By comparison, exhaustive Soxhlet extraction of the same size sample with the same solvent yielded 7.1 mg of C60 and 0.58 mg of C70 in 340 min. Reextraction by MAE of soot initially extracted by Soxhlet increased the yield of Soxhlet alone. Although MAE was limited to less than 0.5-g sample per extraction vessel, multiple samples were extracted with minimal increased extraction time and no reduction in the amount of material recovered. 相似文献