共查询到20条相似文献，搜索用时 187 毫秒
1.
合成了新化合物1,8-二(2-甲基吡啶)辛烷二溴化物,利用<'1H NMR,MS技术进行结构表征,并经X单晶衍射法确定了其单晶结构,结构分析表明,晶体属于三斜晶系,空间群P-1,晶胞参数:a=0.97062(3)nm b=1.04186(4)nm,c=1.32220(4)nm,α=96.028(2)°,β=98.505(2)°,γ=111.731(2)°,V=1.20967nm<'3,Z=2,Dc=1.388Mg·m<'3,μ=1.46mm<'-1,F(000)=524.0,最终偏离因子R=0.0946,wR=0.3134. 相似文献
2.
《陕西教育学院学报》2015,(4):117-120
本论文通过水热反应,使用Cd(Ⅱ)和两种配体间苯二甲酸(1,3-bdc)和1,3-双咪唑丙烷(1,3-bip)合成了一种具有新颖结构的{[Cd(1,3-bip)(1,3-bdc)]·H2O}n配合物,利用元素分析、FT-IR、XRD及热分析等手段对其进行了表征,通过X-射线单晶衍射仪测定了其晶体结构。该晶体属于三斜晶系,空间群P2(1)/c,晶胞参数:a=9.0888(5),b=10.2251(7),c=11.7223(6),α=85.734(5)°,β=68.972(5)°,γ=67.644(6)°,V=937.99(10)3,Z=2。具有二维层状结构。 相似文献
3.
合成了二羟乙基二硫代氨基甲酸锑{Sb(Ⅲ)[S2CN(CH2CH2OH)2]3}配合物.通过元素分析、红外光谱、1H NMR和热重对其进行表征,并用X-射线单晶衍射测定了晶体结构.配合物属于三斜晶系,P1空间群.晶胞参数为:a=0.9942(4)nm,b=1.1036(4)nm,c=1.2445(5)nm,α=104.317(5)°,β=105.208(5)°,γ=94.025(6)°,Z=2,V=1.2633(9)nm3,Dc=1.742 g·cm-3,F(000)=672,μ=1.624 mm-1,最终偏离因子R1=0.0243,WR2=0.0628,S=1.031;配合物的中心锑离子与来自3个配体中的6个硫原子配位,形成6配位的畸变的五角锥构型,分子之间又通过氢键相互作用构成三维网状结构.利用琼脂扩散法测试了配合物的抑菌活性,结果表明该配合物对5种受试菌株有中等强度的抑菌活性. 相似文献
4.
合成了[Co(Im)6]Cl2.4H2O(Im=咪唑)配合物,相对分子质量为610.39,经红外光谱、元素分析、X射线单晶衍射等表征其晶体结构。标题配合物属三斜晶系,P-1空间群,晶胞参数:a=8.806(1),b=9.079(1),c=10.589(1);α=75.20(1)°,β=83.12(1)°,γ=61.87(1)°,V=721.82(13)nm3,Z=1,Dc=1.404g/cm-3。晶体结构中配阳离子[Co(Im)6]2 通过咪唑环的氢原子与末配位的反荷阴离子和晶格水中的氧原子形成复杂的分子间氢键构成3D超分子体系。标题配合物分子中,Co(II)与6个咪唑分子中的氮原子配位,形成六配位的略有畸变的八面体。 相似文献
5.
《绵阳师范学院学报》2017,(11)
室温下,氧化.银与1-甲基-3-苄基-咪唑盐溴化物在二氯甲烷溶液中反应成功合成了目标化合物[(C_6H_5CH_2{C-(NCHCHN)CH_3})_2Ag](2+)[Ag_2Br_4](2+)[Ag_2Br_4](2-).目标化合物通过元素分析,X-ray,核磁表征.目标化合物为三斜晶系,空间群为P-1,晶胞参数a=6.5494(7),b=8.6819(7),c=11.7879(11),α=69.629(2),β=85.183(2)°,γ=69.5570(10)°,V=588.24(10)3,Mr=1440.02,Z=0.50.晶体结构分析表明,目标化合物为[Ag Br_2]-(C_2-Ag-AgBr_2)型单氮杂环卡宾银溴化物,阳离子的电荷由[AgBr_2](2-).目标化合物通过元素分析,X-ray,核磁表征.目标化合物为三斜晶系,空间群为P-1,晶胞参数a=6.5494(7),b=8.6819(7),c=11.7879(11),α=69.629(2),β=85.183(2)°,γ=69.5570(10)°,V=588.24(10)3,Mr=1440.02,Z=0.50.晶体结构分析表明,目标化合物为[Ag Br_2]-(C_2-Ag-AgBr_2)型单氮杂环卡宾银溴化物,阳离子的电荷由[AgBr_2]-平衡.两个氮杂环卡宾配位于银,由银-银键相互作用形成的溴化物阴离子垂直于双卡宾银的平面,目标化合物对L-丙交酯有高的催化性能.CCDC:1576580. 相似文献
6.
7.
合成了一种新的化合物(C6H6C lNO3S)2(H2O)2,测定了其结构.晶体数据表明该配合物属三斜晶系,P-1空间群,晶胞参数为:a=5.8626(8),b=11.7993(17),c=12.7680(18),α=88.286(2)°,β=87.534(2)°,γ=84.121(2)°,V=877.5(2)3,Z=2,Dc=1.708 mg/m3,Rgt(F)=0.0418,wR2(F2)=0.0974,F(000)=464,数据完整度为99.3%,标题化合物含有3种氢键,形成一种三维网状的稳定结构. 相似文献
8.
采用水热合成法合成了化合物C21H15CoN2O4,并测定了其晶体结构.化合物晶体属于三斜晶系,P-1空间群,晶体学参数为:a=0.8709(15)nm,b=1.0111(18)nm,c=1.1836(2)nm,α=68.298(3)°,β=82.913(3)°,γ=78.405(3)°,V=0.9472(3)nm3,Z=2,Dc=1.467g/cm3. 相似文献
9.
《洛阳师范学院学报》2017,(8)
本文合成了一个新的超分子[C_(16)H_(10)O_9][C_(12)H_(12)N_2]_(0.5)·H_2O,并测定了其晶体结构.该晶体属于三斜晶系,P-1空间群,晶胞参数:a=7.7013(4) ,b=11.1712(5) ,c=12.3977(6) ,α=75.589(4)°,β=82.907(4)°,γ=79.022(4)°,V=1010.89(9)~3,Z=4,D_c=1.131 mg/m~3,最终偏差因子R_1=0.0579,wR_2=0.1390[I(2((I)],F(000)=364.0.该配合物通过分子间氢键作用形成三维网络结构. 相似文献
10.
用氢氧化钴、丙二酸(mal)和三吡唑甲烷(tpm)合成了氢键连接的超分子配位化合物[Co(mal)(tpm)(H2O)]·2H2O,该化合物的晶体属正交晶系,Pca21空间群,晶胞参数a=15.414(3)(A),b=9.1174(18)(A),c=12.886(3)(A),α=90°,β=90°,γ=90°,V=1811.0(6)(A)3,Z=4.结晶水与配位水之间存在强的氢键相互作用,将配合物连接成二维超分子结构. 相似文献
11.
12.
13.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
14.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
15.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
16.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
17.
18.
RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
19.
20.
唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献