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Synthesis and Structure of Ag_3PSe_4 总被引:1,自引:0,他引:1
The title compound Ag3PSe4 was synthesized by the reaction of Ag powder,P2Se5 and Se in a molar ratio of 1:1:1 at 500℃ and structurally characterized by X-ray crystallography.The crystal belongs to orthorhombic,space group Pmn21 with cell parameters:a=7.689(4),b=6.660(3),c=6.379(4)A,V=326.7(3)A^3,Z=2,Dc=6.816g/cm^3,Mr=670.42,F(000)=584,μ=31.302mm^-1,R=0.0606,wR=0.1289 and S=1.012,The 3-D structure can be regarded as constructed from the stacking of puckered Ag-P-Se honeycomb-like sheets along the c direction,in which the Ag,P and Se atoms are bonded to each other to form a chair-like six-membered ring,and the rings then build the sheets by sharing edges. 相似文献
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分子间的能量转移是维系生命及其演化的重要方式,也是实现化学反应、构造分子功能材料的重要手段。大量的研究表明,分子间的能量转移可以通过分子间的偶极耦合来实现。偶极是表征分子内电荷空间分布的一个物理参量,偶极耦合是分子间库仑相互作用的一种基本形式。对于光子的吸收和发射过程而言,人们常常利用跃迁偶极来描述分子在基态和激发态之间的跃迁过程中所引起的电荷振荡,因此,多分子体系的光学特性和能量转移过程往往与分子间的跃迁偶极耦合有关。直觉上大家通常认为分子间的能量转移应该是以递进式的非相干传递来实现的,即由接受能量的分子传送给相邻的下一个分子。尽管不断有新的实验通过在能量域和时间域的测量(超快光谱测量)表明分子间的高效能量转移可能具有一定的相干性,但由于光学衍射极限对空间分辨能力的制约,使得对于这种偶极相互作用的相干性形式和特性一直缺乏直接的认识。 相似文献
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0IntroductionThefirstmolecule鄄basedmagnetswerereportedin1986[1].Duringthelasttwodecades,moreandmoreattentionhasbeenpaidtothesynthesisofmolecule鄄basedmagnets,especiallytoPrussianBlueanalogu鄄es[2].TheoldPrussianBlueanalogueshavebeenbroughtuptodateduetoth… 相似文献
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本文使用含时量子主方程,从理论上计算了当分子或者等离激元分别被激发的情形下等离激元-分子耦合体系发光特性的时间和光谱演化,并在此基础上讨论了纳腔等离激元在扫描隧道显微镜(STM)诱导发光中发挥的不同作用.当STM针尖在分子上方,隧穿电子可以直接激发分子时,纳腔等离激元的主要作用是通过提高分子的辐射速率来增强其发光,此时耦合体系表现出具有分子特征的尖锐发光峰.另一方面,当STM针尖非常靠近分子边缘但没有载流子注入直接激发分子时,等离激元-分子之间的相干耦合会在这两个量子客体之间产生相消干涉,导致在分子激子能量附近出现法诺共振,使我们观察到具有法诺凹谷特征的等离激元发光光谱. 相似文献
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用分子振动光谱对已合成的具有顺磁性的化合物 [{Cu(bipy) [C6H4(COO) 2 ]} 2 ·H2 O]n(Ⅰ )和 [Cu( phen) [C6H4(COO) 2 ]]n(Ⅱ )进行深入研究 ,推测它们的结构 ,并将得到的结果与X射线晶体衍射测定的结构进行比较。文章对化合物的红外、拉曼光谱进行归属 ,还讨论了分子振动光谱与结构的关系 相似文献
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1 INTRODUCTION Halide fluxes are excellent media for growing single crystals of chalcogenides[1~5]. On our research in the Ln-Cu-Zn-Se system to find new phases and to search for potential infrared ceramic materials, two new compounds, KHo2CuSe4 and KEr2CuSe4, were synthesized from the reaction of the precursor with KCl flux[6]. In an attempt to synthesize the homologous sulfide by the same method using KBr as flux in a sealed evacuated quartz tube, single crystals of Ho4S3Si2O7 w… 相似文献
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A new cyano-bridged GadoliniumⅢ-IronⅢ complex {[Gd(DMF)3(DMSO)(H2O)3](μ-CN)[Fe(CN)5]}·2H2O (DMF=N,N-dimethylformamide; DMSO=dimethylsulfoxide) was synthesized by the grinding reaction method. It crysta-llizes in the triclinic, space group P1 with cell parameters: a=0.90363(2) nm, b=1.250 78(3) nm, c=1.41303(1) nm, α=93.174(1)°, β=94.406(1)°, γ=91.817(2)°, and V=1.588 87(5) nm3, Dc=1.582 g·cm-3, Z=2, Mr=756.72, F(000)=760, μ=2.645 mm-1. The slightly distorted square-antiprism eightfold-coordinated Gd(Ⅲ) and the approxi-mately oriented octahedrally sixfold-coordinated Fe(Ⅲ) are linked by a cyano-bridge group to construct a dinuclear compound. The {[Gd(DMF)3(DMSO)(H2O)3](μ-CN)[Fe(CN)5]} species are held together via hydrogen bonds to form a three-dimensional framework. The Gd(Ⅲ)-Fe(Ⅲ) interaction is antiferromagnetic. CCDC: 223430. 相似文献
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利用扫描隧道显微镜诱导发光技术, 对有机分子α-6T在Ag(100)表面的自组装和光子发射特性进行了研究. 发现在极低的覆盖率下,α-6T分子以四个分子形成一种独特的风车形状的异构体. 随着覆盖率的增加,α-6T分子倾向于肩并肩紧密排列形成条纹状结构. 进一步增加覆盖率时,分子以低层分子的条纹结构作为模板,一层一层往上生长. 在五层分子厚度的样品上,利用光致方法可以获得分子荧光,这说明顶层分子已经被有效脱耦合. 然而在同样的样品上,STM诱导发光光谱却只展现出类似等离激元的发射特性. 在这种情况下,分子荧 相似文献
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1INTRODUCTIONThepolynucleard10metalcomplexesarepotentialluminescentsensormaterialsduetotheirattractivephotochemicalandphotophysicalpro-perties[1,2].Lowdimensionalmetal-organichalidecomplexeshavereceivedever-interestingattentioninrecentyearsfortheirpotentialapplicationsaselectronicandcatalyticmaterials[3,4].RecentlyHomo-metaloligomersandthechainsofcopperhavebeenreportedbyZubietaandthecoworkersviahydrothermalsyntheses[5,6].Theexistingexamplesofcopperwithmercuryareextremelyrare[7].Intherece… 相似文献