共查询到15条相似文献,搜索用时 109 毫秒
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基于Gaussian 09软件对吲哚紫外光谱的理论研究结果,采用Gaussian View对其紫外光谱中的跃迁轨道进行可视化,让学生对紫外光谱中常见的π→π*跃迁有更感性的认识,以理解紫外光谱的本质,提高教学效果。吲哚的紫外光谱具有典型的π→π*跃迁特征,是紫外光谱教学中常用的案例。以此为例,介绍了Gaussian软件在紫外光谱教学中的具体应用。 相似文献
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探讨了Gaussian软件在红外光谱学教学中的具体应用,帮助学生在课堂上对分子的三维空间结构、振动光谱的理解、振动模式的指认与归属等方面有更加感性的认识,从而提高课堂趣味性,使得教学内容更为形象生动。 相似文献
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介绍了iSpartan软件的特点及其在有机波谱解析教学中的具体应用。分子红外振动模型和红外与核磁波谱的吸收峰归属是波谱教学中的实践难点。通过iSpartan软件的简单可视化操作,使教学内容形象生动,有助于学生感性认知和深刻理解此部分内容,提高了波谱解析课程的教学效果。 相似文献
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以6-甲氧基-7-羟基香豆素的核磁共振氢谱为例,介绍了MestReNova软件在有机化合物波谱解析教学中的具体应用。通过学生对该核磁软件的熟悉和应用,更深理解核磁光谱中所涉及的参数,如化学位移、偶合常数的由来、积分比例与质子数目的关系等,进而提高学生的学习兴趣和学习积极性,在独立处理图谱基础上解析图谱,更好地将理论知识应用到解析实例中,理论知识和实际应用有机融合,有利于培养学生探索能力、解决实际问题的能力,为将来进入科研领域培养思维能力和独立思考能力。 相似文献
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结合环境化学的学科特点和学生的实际情况,探讨Gaussian软件(包括Gaussian03和GaussView)在环境化学教学中的应用。实践表明,引入计算化学软件使抽象的化学理论变得形象、简单,能够大大增强理论知识的生动性和实际应用能力,有利于培养学生的形象思维能力和提高教学效果。 相似文献
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Jinmao You Chenxu Ding Fang Zhu Xuejun Sun Yulin Li Yourui Suo 《Chromatographia》2007,65(9-10):545-553
A highly selective and accurate method based on derivatization with dansyl chloride coupled with liquid chromatography–mass spectrometry has been developed for identification of natural pharmacologically active phenolic compounds in extracts of Lomatogonium rotatum plants (Tibetan herbal medicine) obtained by solid-phase extraction. The number of hydroxyl groups on the dansylated phenols was estimated by LC–MS–MS analysis in positive-ion mode. Dansyl derivatization of the compounds introduced basic secondary nitrogen into the phenolic core structures and this was readily ionized when acidic HPLC mobile phases were used. MS fragmentation of the derivatives generated intense protonated molecular ions of m/z [MH]+ (phenol aglycones were transformed into the corresponding free phenols by cleavage of an aglycone bond). Collision-induced dissociation of the protonated molecule generated characteristic product ions of m/z 234 and 171 corresponding to the protonated 5-(dimethylamino)naphthalene sulfoxide and 5-(dimethylamino)naphthalene moieties, respectively. Selected reaction monitoring based on the m/z [MH]+ to 234 and 171 transitions was highly specific for these phenolic compounds. Characteristic ions with m/z values of [MH – 234]+, [MH – 2 × 234]+, and [MH – 3 × 234]+ were of great importance for estimation of the presence of multihydroxyl groups on the phenolic backbone. 相似文献
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