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31.
32.
J. Kelber A. H. Reis Jr. A. T. Aldred M. H. Mueller O. MassenetG. DePasqualiG. Stucky 《Journal of solid state chemistry》1979,30(3)
BaVSe3 has been synthesized and its crystal structure determined at 293(2)°K. The structure was solved in the hexagonal space group P63/mmc (D46h), with a = 6.9990(11) and c = 5.8621(13) Å. Scans (2 Θ) of a polycrystalline sample revealed that BaVSe3 undergoes a transition to an orthorhombic unit cell (b′ 31/2 a, a′ a, c′ c) at 303(5)°K. Magnetic susceptibility measurements between 4 and 300°K indicate that BaVSe3 is paramagnetic down to 41(1)°K, where magnetic ordering occurs, with a magnetic moment in the ordered phase of 0.2 μB per vanadium atom. The orthorhombic lattice distortion may be caused by the “freezing in” of “soft” vibrational modes. 相似文献
33.
It is shown that with one small exception, the 3-connected graphs admitting longest cycles that contain less than four contractible edges of the parent graph are the members of three closely related infinite families. © 1993 John Wiley & Sons, Inc. 相似文献
34.
A.T. Aldred 《Journal of magnetism and magnetic materials》1979,10(1):53-58
Magnetization measurements have been performed on NpFe2, PuFe2, and AmFe2 (cubic C15-type Laves phase) between 300 and 1100 K. The Curie temperatures were found to be 492 ± 2, 564 ± 2, and 613 ± 3 K, respectively. A correlation was found between the Curie temperature and the magnetic moment per iron atom determined in previous neutron-diffraction experiments. Critical exponents determined for NpFe2 and PuFe2 were found to be close to previously reported values for the chemically ordered metallic system Pd3Fe. The overall magnetic behavior of the compounds studied implies the presence of local magnetic moments, in contrast to the itinerant magnetic behavior of UFe2 noted in the previous paper. 相似文献
35.
Zhu MQ Zhang GF Li C Aldred MP Chang E Drezek RA Li AD 《Journal of the American Chemical Society》2011,133(2):365-372
Both photoswitchable fluorescent nanoparticles and photoactivatable fluorescent proteins have been used for super-resolution far-field imaging on the nanometer scale, but the photoactivating wavelength for such photochemical events generally falls in the near-UV (NUV) region (<420 nm), which is not preferred in cellular imaging. However, using two near-IR (NIR) photons that are lower in energy, we can circumvent such problems and replace NUV single-photon excitations (e.g., 390 nm) with NIR two-photon excitations (e.g., 780 nm). Thus, we have demonstrated that alternating 780 nm NIR two-photon and 488 nm single-photon excitations induces reversible on-off fluorescence switching of immunotargeted nanoparticles in the human breast cancer cell line SK-BR-3. Herein, two-photon absorption not only caused spiropyran-merocyanine photoisomerization within the particles but also imparted red fluorescence. In comparison with single-photon NUV excitations, two-photon NIR laser excitations can potentially reduce absorption-related photodamage to living systems because cellular systems absorb much more weakly in the NIR. 相似文献
36.
Wenlang Li Qiuyi Huang Zhu Mao Juan Zhao Huiyan Wu Junru Chen Zhan Yang Yang Li Zhiyong Yang Yi Zhang Matthew P. Aldred Zhenguo Chi 《Angewandte Chemie (International ed. in English)》2020,59(9):3739-3745
Soft luminescent materials are attractive for optoelectronic applications, however, switching dominant chromophores for property enrichment remains a challenge. Herein, we report the first case of a soft organic molecule (DOS) featuring selective expression of chromophores. In response to various external stimuli, different chromophores of DOS can take turns working through conformation changes, exhibiting full‐colour emissions peaking from 469 nm to 583 nm from ten individual single crystals. Dynamic triplet‐exciton behaviours including thermally activated delayed fluorescence (TADF), room‐temperature phosphorescence (RTP), mechanoluminescence (ML), and distinct mechano‐responsive luminescence (MRL) can all be realized. This novel designed DOS molecule provides a multifunctional platform for detection of volatile organic compounds (VOCs), multicolour dynamic displays, sensing, anticounterfeiting, and hopefully many others. 相似文献
37.
Matthew P. Aldred Amanda J. Eastwood Stuart P. Kitney Gary J. Richards Panos Vlachos Stephen M. Kelly Mary O'Neill 《Liquid crystals》2005,32(10):1251-1264
We report the results of a systematic study of the structure-mesomorphic behaviour relationships of a diverse range of light-emitting liquid crystals, but especially nematic 2,7-disubstituted-9,9-dialkylfluorenes. The dependence of the mesomorphic behaviour and transition temperatures on the nature and length of the terminal chains, the nature, position and number of lateral substituents and the number and nature of aromatic rings with and without heteroatoms in the central core is studied. The results of these studies are used to design polymerizable, light-emitting crystals (reactive mesogens) with a nematic phase having a high clearing point and a melting point below room temperature for facile OLED fabrication. 相似文献
38.
The magnetic susceptibilities of the new cubic intermetallic compounds R3Au3Sb4 (R = Tb, Ho, Er, and Tm) have been measured between 4 and 300 K. The compounds are paramagnetic down to 4 K. The experimental effective magnetic moment of the erbium compound is in agreement with the free-ion value, whereas the effective moments of the other three compounds are lower than the corresponding free-ion values. This discrepancy is interpreted in terms of quenching by the crystalline electric field. 相似文献
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