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本文以N-烯丙基二吡啶甲基胺(Aldpa)和2,2-二(2-吡啶甲胺基)丙酸(Adpa)为配体,合成了2个锌配合物,并运用IR,UV,ES-MS等方法进行了表征.X-衍射晶体结构表明[(Adpa)Zn(CHCOO)]配合物中锌(Ⅱ)离子采取五配位三角双锥构型.紫外和荧光光谱滴定研究结果显示[(Adpa)Zn(CHCOO)]与ctDNA作用强于[(Aldpa)ZnCl2].用MTT法研究了配合物体外对肿瘤细胞生长的抑制作用.实验结果表明与ctDNA作用强的锌配合物抗肿瘤活性较好,二吡啶甲基胺氮原子上的取代基影响相应锌(Ⅱ)配合物的抗肿瘤活性. 相似文献
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5,7-二羟基黄酮与牛血清白蛋白相互作用的研究 总被引:1,自引:0,他引:1
用荧光光谱(FS)和紫外光谱(UV)法研究了5,7-二羟基黄酮与牛血清白蛋白之间的相互作用.实验结果表明,5,7-二羟基黄酮与BSA形成基态复合物导致内源荧光淬灭,淬灭机理主要为静态淬灭.该反应的结合常数4.16×107 L/mol,结合位点数n=1.5;并用同步荧光技术考察了5,7-二羟基黄酮对BSA构象的影响. 相似文献
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合成和表征了一种新的N-苯基二吡啶甲基胺(phdpa)铜配合物[(phdpa)Cu(SCN)](ClO4)。X-衍射晶体结构数据显示配合物中铜原子与配体phdpa中3个N原子、SCN-中S原子和邻近分子中SCN-中N原子配位,形成扭曲八面体结构。生物活性数据显示该铜配合物抑制HepG-2细胞的生长,半数抑制率为10.4μmol.L-1。进一步机理研究数据显示这种SCN-桥联的铜配合物能诱导HepG-2细胞核的分裂,降低其耗氧量和ROS的含量,这表明该铜配合物是一种能影响HepG-2细胞氧代谢的多功能配合物。 相似文献
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We report the study of a low temperature cluster glass state in 5% Mn-doped UGa_3 heavy fermion compound. This compound transforms from a paramagnetic state to a spin-cluster glass state, which is confirmed by measuring the dc susceptibility and magnetization. The ac susceptibility exhibits a frequency-dependent peak around Tf, which provides direct evidence of the cluster glass state. By analyzing the field-dependent magnetization and frequency-dependent ac susceptibility in detail, we deduce that this compound forms a spin-cluster glass state below T_f. 相似文献
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Cu(ClO4)2诱导的N-苯基二吡啶甲基胺的邻位苯甲基化及其溴桥联铜配合物的形成 总被引:2,自引:2,他引:0
N-苯基二吡啶甲基胺和苯甲基溴在Cu(ClO4)2存在的条件下反应导致N-苯基二吡啶甲基胺的邻位苯甲基化和一个新的溴桥联的双核铜配合物的形成。实验结果显示阴离子显著影响反应的选择性,CuCl2和Cu(NO3)2不能提高N-苯基二吡啶甲基胺邻位苯甲基化的选择性。NMR和元素分析数据证实N-苯基二吡啶甲基胺邻位苯甲基化产物的形成。X-射线晶体结构数据表明溴桥联的双核铜配合物中铜原子被3个N原子,1个配位溴离子和1个μ2-桥联的溴结合形成扭曲的三角双锥的构型。研究结果表明Cu(ClO4)2可作为N-苯基二吡啶甲基胺邻位烷基化反应的催化剂。研究结果有助于设计新的选择性苯甲基化催化剂。 相似文献
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Experimental Evidence of Topological Surface States in Mg_3Bi_2 Films Grown by Molecular Beam Epitaxy 下载免费PDF全文
Nodal line semimetal(NLS) is a new quantum state hosting one-dimensional closed loops formed by the crossing of two bands. The so-called type-Ⅱ NLS means that these two crossing bands have the same sign in their slopes along the radial direction of the loop, which requires that the crossing bands are either right-tilted or left-tilted at the same time. According to the theoretical prediction, Mg_3Bi_2 is an ideal candidate for studying the type-Ⅱ NLS by tuning its spin-orbit coupling(SOC). High-quality Mg3 Bi2 films are grown by molecular beam epitaxy(MBE). By in-situ angle resolved photoemission spectroscopy(ARPES), a pair of surface resonance bands around the■ point are clearly seen. This shows that Mg_3Bi_2 films grown by MBE are Mg(1)-terminated by comparing the ARPES spectra with the first principles calculations results. Moreover, the temperature dependent weak anti-localization effect in Mg_3Bi_2 films is observed under magneto-transport measurements, which shows clear two-dimensional(2 D) e-e scattering characteristics by fitting with the Hikami–Larkin–Nagaoka model. Therefore, by combining with ARPES, magneto-transport measurements and the first principles calculations, this work proves that Mg_3Bi_2 is a semimetal with topological surface states. This paves the way for Mg_3Bi_2 to be used as an ideal material platform to study the exotic features of type-Ⅱ nodal line semimetals and the topological phase transition by tuning its SOC. 相似文献
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具有催化水氧化性能钴配合物的研究,对于探索新型氧化反应、发展可持续清洁能源具有重要意义。本文制备了一种新型(3-((二(吡啶-2-亚甲基)氨基)甲基)(3,5-二甲基-1H-吡咯-2-基)甲酮(m-PDA)配体及其与CoCl2形成的Co(Ⅱ)配合物(Co1),运用IR、UV、NMR、ES-MS等方法表征了配体及配合物的结构。研究了Co1在均相溶液中化学驱动催化水氧化性能,结果表明Co1能催化纯水分解释放氧气,催化活性(TON)达到15.38。循环伏安法研究了配合物催化水氧化的过程,证实配合物Co1具有催化水分解释放氧气的特性, 是一种新型非贵金属水氧化的分子催化剂。 相似文献