新型复合功能晶体Cd4TbO(BO3)3结构与性能研究

为探索新型复合功能晶体材料,采用高温固相反应法合成了Cd4TbO(BO3)3多晶粉末,并以NaF-B2O3为助熔剂生长出了小晶体.结构分析表明,Cd4TbO(BO3)3晶体属于单斜晶系,Cm空间群,晶胞常数为a=7.982(1) (A)、b=15.806(3) (A)、c=3.487(7) (A)、α=90°、β=100.57°、γ=90°,晶体中的阴离子基团为[BO3].测量了TG-DSC曲线、紫外可见透过光谱、红外光谱、拉曼光谱,并计算了晶体单位体积Tb的含量.结果表明, Cd4TbO(BO3)3晶体在500~1500 nm范围内透过率大于70;.Cd4TbO(BO3)3晶体单位体积含Tb量为4.624×1021/cm3,是磁光晶体TGG单位体积含Tb量的0.3倍.综上表明Cd4TbO(BO3)3是一种有前途的复合功能晶体材料.     

Synthesis and Characterization of New Dibenzothiophene-based Host Materials for Blue Phosphorescent Organic Light-Emitting Diodes

A series of bipolar host materials containing dibenzo[b,d]thiophene (DBT) or dibenzo[b,d]thiophene 5,5-dioxide core were successfully synthesized, and their physical, photophysical, and electrochemical properties were investigated. The three host materials showed well-localized electron distribution at the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) states, as evidenced by theoretical calculations. Triplet energies of the new host materials are higher than 2.6 eV, and the blend film with bis[2-(4,6-difluorophenyl)pyridinato-C² Misra, A. et al. (2006). Semicond. Sci. Technol., 21, R35.[Crossref], [Web of Science ®] , [Google Scholar],N](picolinato)iridium(III) (FIrpic) as a blue phosphorescent dopant showed highly efficient energy transfer between the host material and dopant.     

Synthesis and X‐ray crystal structure investigations of the complexes of a proton sponge with selected inorganic acids: Crystal structure of DMAN.HI complex

A series of ionic complexes of 1,8–bis(dimethylamino)naphthalene with selected inorganic acids such as HCl, HBr, HI, HSCN and HBF₄ were synthesised and thoroughly investigated by means of powder diffractometry and analytical methods. The crystallographic data for these compounds as well as the results of the structure solution by powder diffraction methods of the 1,8–bis(dimethylamino)naphthalene.HI complex, which crystallizes in the monoclinic system, S.G. P2₁/c (14), a=7.999(2)Å, b=23.053(3)Å, c=7.948(1)Å, β=99.63°, R_F=17.1%, R_wp=15.5%, are discussed and presented in this work. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

BiOCl/ZnO异质结型复合光催化剂的水热合成及其光催化性能

以醋酸锌、氯化钠、硝酸铋和氧氧化钠为原料,利用水热法合成了含BiOCl为1wt;、2wt;、4wt;、8wt;和16wt;的异质结型BiOCl/ZnO复合光催化剂.采用X射线粉末衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)、紫外可见漫反射光谱(UV-Vis DRS)和光致发光(PL)谱等系列手段对所制备的光催化剂进行了表征.以紫外光(254 nm)为光源,酸性橙Ⅱ为光催化反应降解模型,进行光催化活性测试,考察了复合BiOCl对ZnO光催化剂反应活性和稳定性的影响.研究表明,异质结型BiOCl/ZnO复合光催化剂的光催化性能明显优于纯ZnO.当复合BiOCl的含量为4wt;时,光催化活性最佳,为纯ZnO的3.4倍,同时该催化剂在循环使用中具有更好的稳定性.     

X-ray Crystallographic Structures of Two Lamotrigine Analogues: (I) 3,5-Diamino-6-(2-chlorophenyl)-1,2,4-triazine Water Solvate and (II) 3,5-Diamino-6-(3,6-dichlorophenyl)-1,2,4-triazine Methanol Solvate

Abstract The X-ray crystal structures of two lamotrigine derivatives (I) 3,5-diamino-6-(2-chlorophenyl)-1,2,4-triazine, C₉H₈ClN₅, (465BL) as a hydrate, and (II) 3,5-diamino-6-(3,6-dichlorophenyl)-1,2,4-triazine, C₉H₇Cl₂N₅, (469BR) as a methanol solvate, have been carried out at liquid nitrogen temperature and room temperature, respectively. A detailed comparison of the two structures is given. Both are centrosymmetric with (I) in the orthorhombic space group Pbca, a = 12.2507(3), b = 15.7160(6), c = 21.71496(9) ?, Z = 16, and (II) in the monoclinic space group C2/c, a = 38.553(3), b = 4.9586(2), c = 14.546(2) ?, β = 111.59(1)°, Z = 8. Final R indices [I > 2sigma(I)] for (I) are R1 = 0.0670, wR2 = 0.1515 and for (II) R1 = 0.0434, wR2 = 0.1185. Structure (I) has water of crystallization in the lattice and (II) includes a solvated CH₃OH. Structure (I) is characterized by having two crystallographically independent molecules, A and B, of 465BL, per asymmetric unit. Molecule B has a very unusual feature in that the 2-chlorophenyl ring is statistically disordered, occupying site (1) in 87.5% of the structure and site (2) in 12.5% of the structure. Sites (1) and (2) are related by an exact 180° pivot of the phenyl ring about the ring linkage bond. The presence of two independent molecules per asymmetric unit provides an ideal opportunity for the conformational flexibility of the molecule 465BL to be studied. Structure (I) also includes a further unusual feature in that the lattice contains one fully occupied water molecule and an additional solvated water which is only 33% occupied. Index Abstract Rex A. Palmer, Brian S. Potter, Michael J Leach and Babur Z. Chowdhry The crystal structures of two lamotrigine analogues: (I) 3, 5-diamino-6-(2-chlorophenyl)-1, 2, 4-triazine, water solvate and (II) 3, 5-diamino-6-(3,6-dichlorophenyl)-1, 2, 4-triazine methanol solvate are presented. Structure (I) includes two molecules per asymmetric unit labeled A and B where molecule B is unusually disordered having Cl in either position 2 (87.5% occupied) or position 6 of the phenyl ring (12.5% occupied), the two sites being related by 180deg rotation about the ring linkage bond. Molecule I(A) on the other hand shows no disorder. The relative orientations of the two rings in I(A and B) and in II is shown to be different. Lamotrigine and analogues have been investigated for some time for their effects on the central nervous system. For example both lamotrigine and 5-(2,3,5-trichlorophenyl)-2,4-diaminopyrimidine (code name BW 1003C87) are voltage-gated sodium channel blockers as well as blocking the release of the neurotransmitter glutamate. BW 1003C87 has also been shown to reduce the release of glutamate evoked by veratrine in brain tissue, providing a therapeutic approach in both cerebral ischemia and epilepsy [B. S. Meldrum, J. H. Swan, M. J. Leach, M. H. Millan, R. Gwinn, K. Kadota, S. H Graham, J. Chen, R. P. Simon , Brain Res., 1992, 593, 1.]. This is one of a series of papers on the structures of lamotrigine analogues.      

Porous glass-ceramics composed of a titanium phosphate crystal skeleton: A review

Bulk microporous glass-ceramics with a skeleton of two types of functional titanium phosphate crystal were prepared by controlled crystallization of RTi₂(PO₄)₃ (

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glasses, and chemical treatment. One crystal is a NASICON-type with a three-dimensional network structure of TiO₆ and PO₄ while the other is a zirconium phosphate-type crystal Ti(HPO₄)₂ · 2H₂O with a two-dimensional layered structure. The mean pore diameter and porosity of 30–60 nm and 40–60 vol.% were achieved. Porous CaTi₄(PO₄)₆ glass-ceramics have excellent properties as supports for immobilization of enzymes, humidity sensors and porous LiTi₂(PO₄)₃ glass-ceramics as ion exchange media. Conspicuous bacteriostatic activities were found for the partially Ag-exchanged porous LiTi₂(PO₄)₃ and Li_1.4Ti_1.6Al_0.4(PO₄)₃. Integrated microporous glass-ceramics with skeletons of LiTi₂(PO₄)₃ (LTP) and Ti(HPO₄)₂ · 2H₂O (TP) crystals were synthesized utilizing a novel discovery that LTP is transformed into TP in acid solution.     

Silica films on silicon carbide: a review of electrical properties and device applications

This paper reviews the present knowledge on silica films (SiO₂) on silicon carbide (SiC). First, kinetic of thermal oxidation of SiC is described, and the effects of a great number of parameters (various SiC polytypes, substrate type, substrate orientation…) are discussed. Mainly, thermal oxides grown on SiC are close to stoichiometric silica and the oxidation rate depends on the terminal face of the SiC monocrystal. The next four sections discuss the electrical properties of the oxide, and of the oxide/SiC interface, and especially the effects of materials and technological process on the interface state density and the effective oxide charge (Section 5), and the origin of the interface states are discussed in detail ( Section 6). Oxides grown on n-type SiC have electrical properties (in terms of dielectric strength, leakage currents, interface trap, and oxide charges) measured by means of metal-oxide-semiconductor (MOS) structures, similar to oxides grown on silicon. Until recently, p-type SiC MOS structures have had a large equivalent oxide charge and larger interface state densities in spite of many efforts, compared to silicon MOS structures. It seems nevertheless that recent studies have improved the SiO₂/SiC interfacial quality. Aluminum, carbon and alkali species are the main suspected contaminants. Finally, Section 7 presents the applications of oxide films in SiC-based devices: MOS capacitors and MOS field effect transistors (MOSFETs) for microelectronics, MOSFETs for power electronics, and some applications using silica layers as a passivation layer. In spite of a smaller than required carrier mobility in the inversion layer, MOS field effect transistors (MOSFETs) have been demonstrated to operate up to 650°C and integrated circuits based on NMOS and PMOS technologies have been successfully operated up to 300°C. Vertical power MOSFETs are also of importance but their performances are still limited by a specific on-resistance larger than device requirements. The effect of charges present in the oxide on the electrical properties of high voltage diodes is also briefly discussed.     

Fitted higher heating value from proximate analysis of torrefied pellets of Pinus taeda L.

Abstract

A proximate analysis by using multiple linear regressions was used for the first time to analyze torrefied Pinus taeda L. pellets. The result, obtained from three fitted equations: HHV = 0.3921?×?FC + 0.1578?×?VM (statistical R² = 99.91%), FC = 39.4886 – 0.1042×T – 0.5640×t?+?0.0027×(T?×?t) (statistical R² = 75.05%), and VM = 0.3402×T?+?1.4262×t – 0.0061×(T?×?t) (statistical R² = 99.75%), indicated that the torrefaction of the pellets increased their high heating value (HHV) and fixed carbon (FC) and decreased the volatile matters (VM). These equations fitted the results better than equations published elsewhere.     

“Synthesis,design and characterization of supramolecular self-assembly of calix[4]resorcinare substituted LCs”

A new class of supramolecular calix[4 (a) Kuang, G.C., Jia, X.R., Teng, M.J., Chen, E.Q., Li, W.S., Ji, Y., Chem Mater. 2012, 24,71–80; (b) Macros, M., Omenat, A., Serrano, J.L., and Ezcurra, A., Adv. Mater. 1992, 4, 285–287.[Crossref], [Web of Science ®] , [Google Scholar], [Google Scholar]]resorcinarene substituted alkoxy side chain (-OC₅H₁₁, -OC₈H₁₇, -OC₁₀H₂₁) has been synthesized and well characterized. These supramolecular compounds were investigated by polarizing optical microscope (POM), differential scanning calorimetry (DSC), thermogravimmetric analysis (TGA) and high-temperature X-ray diffraction studies (XRD). The present synthesized supramolecular derivatives are promising to stabilize the hexagonal columnar phase over a broad thermal range. All the synthesized derivatives showed hexagonal columnar phase at lower temperature and showed enantiotropical nature. Compound 2a with small alkyl spacer on eight side showed higher thermal stability as compare to higher alkyl spacer substituted compounds 2b and compound 2c. These research results suggest that calix[4 (a) Kuang, G.C., Jia, X.R., Teng, M.J., Chen, E.Q., Li, W.S., Ji, Y., Chem Mater. 2012, 24,71–80; (b) Macros, M., Omenat, A., Serrano, J.L., and Ezcurra, A., Adv. Mater. 1992, 4, 285–287.[Crossref], [Web of Science ®] , [Google Scholar], [Google Scholar]]resorcinarene was a good platform to construct bowl-shaped derivatives to exhibits the columnar liquid crystal phase and the observed liquid crystalline properties were greatly effected by the substituted alkoxy side chain on eight side of calix[4 (a) Kuang, G.C., Jia, X.R., Teng, M.J., Chen, E.Q., Li, W.S., Ji, Y., Chem Mater. 2012, 24,71–80; (b) Macros, M., Omenat, A., Serrano, J.L., and Ezcurra, A., Adv. Mater. 1992, 4, 285–287.[Crossref], [Web of Science ®] , [Google Scholar], [Google Scholar]]resorcinarene skeletone. All the synthesized compounds were characterized by FT-IR, ¹H NMR and ¹³C NMR spectroscopy.     

Full Permanent Memory Effect in PDLC Films

Permanent memory effect in polymer dispersed liquid crystal (PDLC) films prepared by thermal polymerization induced phase separation (PIPS) were studied. New trimethylolpropane trimethacrylate (TMP3MA)/poly(propylene glycol) methacrylate (PPGMA375)/E7/AIBN and pentaerythritol tetraacrylate (PE4A)/poly(propylene glycol) acrylate (PPGA475)/E7/AIBN PDLC films showed 86% permanent memory effect with E90 = 6 V/μm and memory state contrast of 70% and full permanent memory effect with E90 = 3 V/μm and total memory state contrast, respectively. These materials with two stable states (opaque and transparent) seem to be promising for the development of a new class of optical memories as they can be used for electrically write information, optically read the written information and they can be thermally erased back to the initial scattered state.     

Structure of the 1∶1∶1 complex between 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6), 2,3-dichlorophenol,and water

The structure of the title compound, C₁₂H₂₄O₆·C₆H₄OCl₂·H₂O, has been determined by X-ray diffraction methods. The crystals are monoclinic, space groupP2₁ witha=8.628(2),b=13.767(4),c=9.676(2), =96.38(2)°, andD _x =1.295 Mg m^–3 forZ=2; 2355 reflections were recorded on a CAD4 diffractometer using CuK radiation atT=243° K. The structure was solved usingMultan andShelx. The finalR value based on 1901 reflections is 0.071. The 18-crown-6 molecule has approximatelyD _3d symmetry. The host molecule (18-crown-6), the guest molecule (dichlorophenol), and water form a super-molecule. Binding between host and guest is effected by bridging water molecule: the water and dichlorophenol molecule are linked by a very strong hydrogen bond (OO=2.58 Å); weaker interactions exist between water and oxygens of the crown ether (OO distances 2.85 and 2.90 Å).     

Correlated atomic motions in Pd79Si21 alloy glass observed by inelastic pulsed neutron scattering

The dynamical structure factor, , for Pd₇₉Si₂₁ alloy glass was measured with a fine Q and ω resolution by inelastic neutron scattering using the chopper spectrometer, MARI, installed at the ISIS facility, Rutherford Appleton Laboratory. Fine structure is clearly observed in over the dynamic range

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, which indicates the existence of well defined modes caused by correlated atomic motions even in the disordered structure of metallic alloy glasses.     

Synthesis of a BDT-based small-molecule acceptor with dye end groups for organic photovoltaic cell application

ABSTRACT

An acceptor-donor-acceptor (A–D–A)-type small molecule, BDT-IN, having a benzo[1,2-b:4,5-b']dithiophene (BDT) unit as its electron-donating core (D) and an 1,3-indanedione (IN) unit as its electron-withdrawing end group (A), was synthesized by Knoevenagel condensation. The BDT-IN film showed broader UV absorption with a greater red shift (λ_max = 622 nm) than that of the BDT-IN solution (λ_max = 570 nm). The organic photovoltaic cells were fabricated with an ITO/PEDOT:PSS/poly(3-hexylthiophene): BDT-IN/LiF/Al configuration, and showed a power conversion efficiency of 0.23%.     

Photo Alignment and Patterning of Liquid Crystal Polymer Films and Optical Devices by Side-Chain Photopolymers

Prerequisite for virtually all nematic field-effects on which liquid crystal displays (LCDs) are based is stable, uniaxial surface alignment with defined bias tilt angle between the long liquid crystal (LC) axes and their display boundaries. Since the invention of the TN-LCD [1 Schadt, M., & Helfrich, W. (1972). Mol. Cryst. Liq. Cryst., 17, 355.[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]] in 1970 until recently this was achieved by confining liquid crystals between mechanically brushed surfaces [2 Cognard, J. (1982). J. Mol. Cryst. Liq. Cryst. Suppl. Ser., 1, 1–74. [Google Scholar]–4 Aoyama, H., Yamazaki, Y., Matsuura, N., Mada, H., & Kobayashi, S. (1981). Mol. Cryst. Liq. Cryst. Lett., 72, 127.[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]]. We have first shown in the 1990s that, non-mechanical, uniaxial, tilted and patterned LC-alignment is possible by anisotropic Van der Waals surface interactions [5 Schadt, M., Seiberle, H., & Schuster, A. (1996). Nature, 381, 212. US Patent (1995) US-6, 215, 539.[Crossref], [Web of Science ®] , [Google Scholar]], namely by directional polymerization of photo-sensitive side-chain polymers films [5 Schadt, M., Seiberle, H., & Schuster, A. (1996). Nature, 381, 212. US Patent (1995) US-6, 215, 539.[Crossref], [Web of Science ®] , [Google Scholar], 6 Schadt, M., Schmitt, K., Kozinkov, V. & Chigrinov, V.G. (1992). Jpn. J. Appl. Phys., 31, 2155. US patent (1991) US 5,389,698.[Crossref], [Web of Science ®] , [Google Scholar]] by linear polarized UV light. The LPP model is reviewed and its applications enabling high resolution multi-domain liquid crystal displays operated in transmission and reflection are discussed. Examples are given for optical retarders integrated into LCDs, anisotropic liquid crystal polymer (LCP)-films for 3D imaging, interference color filters, wide-view films and anisotropic polymer surface topologies.     

Heavily carbon-doped GaAs grown on various oriented GaAs substrates by MOMBE

Heavily carbon-doped GaAs epitaxial layers have been grown simultaneously on (100), (111)A, (111)B, (411)A, (411)B and (711)A semi-insulating (SI) GaAs substrates by metalorganic molecular beam epitaxy (MOMBE) using trimethylgallium (TMG) and elemental As (As₄). The hole concentration and surface flatness strongly depend on the substrate orientation. The highest carbon incorporation was observed for the layers grown on a (411)A substrate with a hole concentration of 1.0 × 10²¹ cm^{− 3} and a lattice mismatch of Δd/d = −0.48%. Atomic force microscope (AFM) images reveal that the epilayers grown on (411)A substrates exhibit extremely flat surfaces, although these layers contain the highest carbon concentration.     

Fe掺杂TiO2超细粉体的能带隙调控与光催化性能

采用简单的低温固相反应法合成了铁掺杂二氧化钛超细粉体(Fe-TiO2),并用XRD、UV-Vis、SEM/ EDS、N2吸附-脱附等手段对材料进行了表征,探讨了投料比与模板剂对材料能隙宽度的影响,研究了材料微结构及其参数与光催化降解吡啶之间存在的内在联系.结果表明,Fe3+进入锐钛矿TiO2晶格是以同晶取代方式主要从c-轴进入,使c轴投影方向Fe密度增加;不同模板剂和投料比对Fe-TiO2的能隙宽度都具有调控作用,但模板剂的调控作用相对明显;Fe-TiO2材料的晶格失配率与光催化性能呈正相关性.以CTAB为模板剂、不同投料比下Fe-TiO2粉体对吡啶的可见光降解率(k)依次为:kFe-TiO2(nFe/nTi=5∶10)(98.27;)>kFe-TiO2(nFe/nTi=3∶10)(89.63;)>kFe-TiO2(nFe/nTi=2∶10) (83.68;)>kFe-TiO2 (nFe/nTi=1∶10)(78.08;)>kTiO2(10.13;);在确定投料比nFe/nTi=1∶ 10、不同模板剂下,Fe-TiO2粉体对吡啶的可见光降解率(k)为:kSDS(94.24;)>kCTAB(78.08;)>kSDBS(70.15;)>kDHSB(64.58;).吡啶的可见光降解效率主要依赖于Fe-TiO2粉体表面光生载流子本身的能量而不是比表面积、能隙宽度的大小.     

Accurate structural study of langasite-family Ca<Subscript>3</Subscript>TaGa<Subscript>3</Subscript>Si<Subscript>2</Subscript>O<Subscript>14</Subscript> crystal

An accurate X-ray diffraction study of Ca₃TaGa₃Si₂O₁₄ single crystal has been performed using two datasets obtained on a diffractometer equipped with a CCD area detector (a = 8.1056(2) Å, c = 4.9800(1) Å, sp. gr. P321, Z = 1, R/wR = 0.486/0.488%). A model structure is determined which is characterized by a high degree of reproducibility of structural parameters. Each site in Ca₃TaGa₃Si₂O₁₄ is occupied by atoms of only one type. Nevertheless, its structural feature is asymmetric disordering of sites of Ca, Ta, Ga, and two out of three oxygen atoms occupying special and general sites. A transition of some part of Ca atoms (~3%) from 3e sites on the twofold symmetry axis to general 6g sites is revealed.     

Unique assemblies of alternating positively and negatively charged layers, directed by hydrogen bonds, ionic interactions, and π-stacking in the crystal structures of complexes between mellitic acid (benzenehexacarboxylic acid) and five planar aromatic bases

Benzenehexacarboxylic acid, mellitic acid (MA), has been used as a core motif to study possible radial self-assembly using complementary aromatic bases. By mixing water solutions of the components, crystals of the salts of MA with 4-aminopyridine (AP), 4-dimethylamino-pyridine (DM), 2,2-bipyridine (DP), o-phenanthroline (PL), and melamine (ML) have been obtained. The MA^–n ions have assembled in either extended sheets for MA^–2 or extended ribbons for MA^–4 by direct hydrogen bonding between MA and MA and additionally through mediation of hydrogen bonds to water molecules that distribute the negative charges throughout the MA sheet or ribbon. Most of the O atoms in carboxyl groups in the MA ions in the five complexes have been rotated significantly out of the plane of the central benzene ring. There are multiple base molecules, two or four, for each mellitic acid ion in the five complexes. Most of the NH⁺ moieties in all five bases make direct NH⁺ O–C hydrogen bonds with MA^–n . The planar base ions are generally arranged in stacks in which the components range from being parallel, with interplanar separations of 3.5 Å, to having a considerable tilt with respect to each other with nearest interplanar separation of atoms greater than 3.9 Å. These geometric characteristics are reflected in the color of the crystals. The three-dimensional networking makes some of the crystals very hard. Cell dimensions: 1, C₃₂H₃₀N₈O₁₂ 2H₂O, C2/c, a =13.764(2) Å, b =18.053(3) Å, c =14.876(4) Å, =105.99(2)° 2, C₂₆H₂₆N₄O₁₂ 3H₂O, P2₁/n, a =15.891(1) Å, b =10.444(1) Å, c =18.242(1) Å, =97.00(1); 3, C₆₄H₄₄N₈O₂₄ 7H2O, P2₁/c, a =23.016(4) Å, b =15.241(2) Å, c =19.124(2) Å, =100.60(1)° 4, C₃₆H₂₂N₄O₁₂, P2₁/n, a =14.581(1) Å, b =10.472(1) Å, c =20.607(2) Å, =106.43(1); 5, C₁₈H₁₈N₁₂O₁₂ 2H₂O, , a =8.257(2) Å, b =8.986(2) Å, c =9.383(1) Å, =98.60(1)°, =96.38(2)°, =117.07(1)°.     

Crystal structure of two tricyclic antidepressant drugs: Lofepramine hydrochloride and dothiepin hydrochloride

The structures of lofepramine·HCl (1) [C₂₆H₂₇ClN₂O·HCl, triclinic, space groupP¯1, witha=17.273(8),b=9.451(7),c=7.447(5) Å,=101.88(5),=96.14(6), =96.38(5)°,Z=2] and dothiepin·HCl (2) [C₁₉H₂₁NS·HCl, monoclinic, space groupP2₁/c, witha=14.296(5),b=9.364(3),c=13.724(3) Å,=97.77(3)°,Z=4] were determined by the symbolic-addition procedure and refined by least-squares methods to anR of 0.045 (2253 diffractometer-measured reflections) for (1) and 0.051 (1696 reflections) for (2). The butterfly angle between the two aromatic ring mean planes in the tricyclic system is 123.7° in (1) and 126.2° in (2); the middle seven-membered heteroring shows twist, bow, and stern angles of 18.1, 127.6, and 149.2° for (1) and 14.6, 132.8, and 155.5° for (2). The configuration at the propylamino C(16)-C(17) and C(17)-C(18) bonds of the side chain in (1) is close totrans-trans and in both compounds the only approach less than van der Waals distances is the hydrogen bond between the positively charged dimethylammonium and the chloride ion [3.01 and 2.96 Å for (1) and (2), respectively].     

Scx:Fey:Cuz:LN晶体的生长及非挥发性全息存储的研究

本文首次采用Czochralski法生长优质的Scx:Fey:Cuz:LN (x=0,1;, 2;, 3;, 3.5;, y=0.1;, z=0.06;)晶体.测试了晶体抗光致散射能力,以二波耦合光路测试晶体的衍射效率、写入时间和擦除时间,计算光折变灵敏度和动态范围.结果表明:Sc(2mol;):Fe:Cu:LN和Sc(3mol;):Fe:Cu:LN晶体抗光致散射能力比Fe:Cu:LN晶体高两个数量级以上,Scx:Fey:Cuz:LN晶体的写入速度、光折变灵敏度和动态范围等全息存储性能优于Fe:LN晶体.首次采用氪离子激光(482.0 nm,蓝光)作开关光,氦氖激光(632.8 nm,红光)做记录光,以Sc:Fe:Cu:LN晶体作为双光子全息存储记录介质,实现了双光子全息存储固定(非挥发性全息存储).