卤族元素,Halogen
1)Halogen[英]["h?l?d??n][美]["h?l?d??n]卤族元素
1.Quantum Chemical Study on the Effect ofHalogenSubstitution on Photosensitization of Perylenequinonoid Photosensitizer*;结果发现 ,卤代作用降低了HMB母体的HOMO和LUMO能级 (EHOMO和ELUMO)及其差值△E ,随卤族元素从上到下 ,EHOMO和ELUMO呈增大趋势 ,而△E呈减小趋势 ,使得分子激发光谱有不同程度的红移 ,在增加PQP三重态量子产率的同时降低了分子最低三重激发态的能量 ,两种作用相互抵消 ,使得卤代物的 1O2 量子产率与母体相似 ;增加了分子的绝热电子亲合势 ,使分子产生O2 -的能力下降 ;卤原子的引入 ,降低了HMB母体分子内氢键的强度 ,同时使顺式构型的分子内质子传递势垒增大 ,而使反式构型势垒减小 。
英文短句/例句
1.Study on interfered experiment for measuring chloride in serum with α-amylase and CNP-G3 as substrate from haloid elements and other ions卤族元素等对酶法测定血清氯化物的干扰实验
2.The Behavior of Halogens at High Temperature and High Pressure: A Monte Carlo Study;卤族元素的高温高压行为的蒙特卡罗研究
3.Preparation of Halogen Element-doped TiO_2 and Photocatalysis Properites Research卤族元素掺杂TiO_2的制备及光催化性能研究
4.A chemical compound of a halogen with a more electropositive element or group.卤化物由一种卤素与另外一带正电的金属元素或族形成的一种化合物
5.Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.卤素包括氟、氯、溴、磺、砹有化学联系的五个非金属元素一族中的任何一个
6."Fluorine: Nonmetallic chemical element, chemical symbol F, atomic number 9."氟 周期表VIIa族卤素中最轻、最活泼的化学元素,化学符号为F,原子序数9。
7.INAA OF HALOGEN IN GEOLOGICAL STANDARDS地质标样中卤素元素的中子活化分析
8.The Determination of Traces of Element in the Shell of Artemia With ICP-AES Method;ICP-AES法测定卤虫壳中的微量元素
9.To treat or combine with a halogen.卤化用卤素处理或与卤素引起化合
10.Determination of Halogen in Electronic Components by Oxygen Bomb-Ion Chromatography氧弹燃烧-离子色谱法测定电子元器件中的卤素
11.Separation and Determination of Rare Earth Element in the Halogenatehal Water by ICP-MS with Precipitation共沉淀分离-ICP-MS快速测定卤水中稀土元素
12.actinide chalcogenide锕系元素硫族元素化合物
13.any of the chemically inert gaseous elements of the helium group (group 8A or 0 of the periodic table).元素周期表中氦族（A族或族）中任何在化学上具有惰性的气体元素。
14.a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium.一种极不稳定的放射性元素（卤素系列中最重的一种），铀和钍腐烂的产物。
15.portable xenon halogen projector手提式氙卤素放映机
16.AOX Value ( Adsorbable Organic Halogen)可吸附的有机卤素值
17.halogen-quench Geiger tube卤素猝灭盖革计数管
18.portable halogen cine projector便携式卤素电影放映机
相关短句/例句
Halogen group elements卤族元素
1.Halogen group elements are indispensable to human being, under normal condition, adult dosage below F 4 mg/d, Cl 1.卤族元素是人体的必需元素，正常情况下成人摄入量不超过：F 4 mg/d、Cl 1。
3)halogen element卤素元素
1.The geochemical characteristics ofhalogen elements in the mining district indicate that the enrichment of Br and I is much higher than that of F and Cl in the deposit.对矿区内卤素元素地球化学特征的研究结果表明 ,矿区内溴、碘的富集程度远比氟、氯高 ,这与古油藏油田卤水的形成演化有关。
2.This paper discusses the distribution characteristics ofhalogen elements in this deposit, indicating that:(1) the enrichment extent of Br and I is much higher than that of F and Cl; and F, Cl in Hg ores and near ore wall rocks with near ores than in Au ores and distant wall rocks; (2) from the distant wall rocks to near ore wall rocks to Hg ore.本文对该矿床矿石及围岩中的卤素元素分布特征进行了一定的研究。
3.With plentiful and real materials, this paper demonstrated the relations between the formation, content and distribution law ofhalogen elements (F, Cl, Br and Ⅰ) in ground water, and the composition of the aqiferous meson in ground water, quality of the overlying rock and soil,the condition of the run-off, environment of the oxidation and reduction and mineralized degree of ground water.本文以丰富的实际资料，论证了地下水的卤素元素（F、Cl、Br、I）的形成、含量及其分布规律与含水介质成分、上覆岩土性质、地下水退流条件、氧化还原环境、地下水矿化度之间的关系。
4)platinum group element铂族元素
1.Neutron activation analysis orplatinum group elements in geological materials;地质样品的铂族元素中子活化分析研究
2.Two Co-rich seamount crust reference materials(MCPt-1 and MCPt-2) forplatinum group elements(PGEs) with ultra-fine particle size were prepared.2个富钴结壳铂族元素(PGEs)标准物质MCPt-1和MCPt-2的原样分别由中国和俄罗斯取自中太平洋海山和西太平洋麦哲伦海山区。
5)platinum group elements铂族元素
parison ofplatinum group elements (PGE) between Jianchaling and Jinchuan nickel sulfide deposits and its significance;煎茶岭与金川硫化镍矿床的铂族元素地球化学特征对比及其意义
2.Geochemical characteristics of Platinum group elements of the sulfide nickel ores and related rocks in Jianchaling, Lueyang county, Shannxi province, China and their implication for genesis;煎茶岭硫化镍矿床的铂族元素地球化学特征及其意义
6)main group element主族元素
1.The β2-isomer Keggin structure heteropolytungstoarsenate complexes containingmain group elements have been prepared and characterized by ICP,UV,IR,XPS,XRD and 183W NMR.合成了4种主族元素取代的钨砷杂多配合物,通过ICP和TG曲线确定其通式为:K11,12〔M(AsW11O39)2〕。
2.The results show that the new compounds are of Keggin structure,and themain group elements have already entered into the skeletons of new compounds.结果表明,新配合物具有典型的Keggin结构,且主族元素进入到配合物的骨架中。
延伸阅读
卤族元素卤族元素halogenelement周期系ⅦA族元素。包括氟、氯、溴、碘、砹。简称卤素。它们在自然界都以典型的盐类存在，是成盐元素，halogen的含义即是“成盐”。卤族元素的单质都是双原子分子，它们的物理性质的改变都是很有规律的，随着分子量的增大，卤素分子间的色散力逐渐增强，颜色变深，它们的熔点、沸点、密度、原子体积也依次递增。卤素的化学性质都很相似，它们的最外电子层上都有7个电子，有取得一个电子形成稳定的八隅体结构的卤离子的倾向，因此卤素都有氧化性，原子半径越小，氧化性越强，因此氟是单质中氧化性最强者。卤素的氧化态为＋1、＋3、＋5、＋7，与典型的金属形成离子化合物，其他卤化物则为共价化合物。卤素与氢结合成卤化氢，溶于水生成氢卤酸。卤素之间形成的化合物称为互卤化物，如ClF3、ICl。卤素还能形成多种价态的含氧酸，如HClO、HClO2、HClO3、HClO4。卤素单质都很稳定，除了I2以外，卤素分子在高温时都很难分解。氯（右）溴（中）碘（左）的外观
