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91.
Kosuke Igawa Nobuto Yoshinari Takumi Konno 《Acta Crystallographica. Section C, Structural Chemistry》2012,68(9):o332-o334
The asymmetric unit of the optically resolved title salt, C8H12N+·C4H5O4S−, contains a 1‐phenylethanaminium monocation and a thiomalate (3‐carboxy‐2‐sulfanylpropanoate) monoanion. The absolute configurations of the cation and the anion are determined to be S and R, respectively. In the crystal, cation–anion N—H...O hydrogen bonds, together with anion–anion O—H...O and S—H...O hydrogen bonds, construct a two‐dimensional supramolecular sheet parallel to the ab plane. The two‐dimensional sheet is linked with the upper and lower sheets through C—H...π interactions to stack along the c axis. 相似文献
92.
Mingdeng Wei Yoshinari Konishi Hideki Sugihara Hironori Arakawa 《Solid State Communications》2005,133(8):493-497
Nanotubes TiO2 were synthesized from layered titanate Na2Ti3O7 particles by a soft chemical process. These nanotubes have a hollow structure with an opening end. The wall of nanotubes is very well crystallized multi-wall structure. The inner diameters of nanotubes are ca. 30-40 nm and the length up to several hundreds nanometers. XRD results show that TiO2 phase was formed during the procedure of exfoliating Na2Ti3O7 particles into nanosheets. Based on our experimental results, an exfoliating-rolling model was proposed for formation of nanotube structure. 相似文献
93.
Iron fluoride thin films were successfully grown by Pulsed Laser Deposition (PLD), and their physico-chemical properties and electrochemical behaviours were examined by adjusting the deposition conditions, such as the target nature (FeF2 or FeF3), the substrate temperature (Ts ≤ 600 °C), the gas pressure (under vacuum or in oxygen atmosphere) and the repetition rates (2 and 10 Hz). Irrespective of the FeF2 or FeF3 target nature, iron fluoride thin films, deposited at 600 °C under vacuum, showed X-ray diffraction (XRD) patterns corresponding to the FeF2 phase. On the other hand, iron fluoride thin films deposited at room temperature (RT) from FeF2 target were amorphous, whereas the thin films deposited from FeF3 target consisted of a two-phase mixture of FeF3 and FeF2 showing sharp and broad diffraction peaks by XRD, respectively. Their electrochemical behaviour in rechargeable lithium cells was investigated in the 0.05-3.60 V voltage window. Despite a large irreversible capacity on the first discharge, good cycling life was observed up to 30 cycles. Finally, their electrochemical properties were compared to the ones of iron oxide thin films. 相似文献
94.
Aiming at improving the durability of anodic electrochromic nickel oxide thin films, Ni-M-O (M = Co, Ta) thin films were grown by pulsed laser deposition (PLD), using optimized conditions, namely room temperature and 10−1 mbar oxygen pressure. For low Co and Ta contents (<5%), both additions lead to a loss of the [1 1 1] preferred orientation of the NiO rock-salt structure followed by a film amorphization with increasing Ta amount. Among the two series of metal additions (M ≤ 20%), the Ni-Co-O (5% Co) and Ni-Ta-O (10% Ta) thin films show the highest electrochemical performances especially in respect of improved durability. If the enhanced properties are associated with a limited dissolution of the oxidized phase for the Ni-Ta-O system, the opposite trend is observed for the Ni-Co-O system as compared to pure NiO. 相似文献
95.
Rycce S. Pratikha Takahiro Inoue Yuka Arai Tatsuhiro Kojima Nobuto Yoshinari Takumi Konno 《中国化学会会志》2020,67(12):2189-2197
The reaction of Na[CoIII(d -ebp)] (d -H4ebp = N,N′-ethylenebis[d -penicillamine]) with [(AuICl)2(dppe)] (dppe = 1,2-bis[diphenylphosphino]ethane) gave a cationic AuI4CoIII2 hexanuclear complex, [CoIII2(LAu4)]2+ ([ 1 ]2+), where [LAu4]4− is a cyclic tetragold(I) metalloligand with a 32-membered ring, [AuI4(dppe)2(d -ebp)2]4−. Complex [ 1 ]2+ crystallized with NO3− to produce a charge-separation (CS)-type ionic solid of [ 1 ](NO3)2. In [ 1 ](NO3)2, the complex cations are assembled to form cationic supramolecular hexamers of {[ 1 ]2+}6, which are closely packed in a face-centered cubic (fcc) lattice structure. The nitrate anions of [ 1 ](NO3)2 were accommodated in hydrophilic and hydrophobic tetrahedral interstices of the fcc structure to form tetrameric and hexameric nitrate clusters of {NO3−}4 and {NO3−}6, respectively. An analogous CS-type ionic solid formulated as [NiIICoIII(LAu4)](NO3) ([ 2 ](NO3)) was obtained when a 1:1 mixture of Na[CoIII(d -ebp)] and [NiII(d -H2ebp)] was reacted with [(AuICl)2(dppe)], accompanied by the conversion of the diamagnetic, square-planar [NiII(d -H2ebp)] to the paramagnetic, octahedral [NiII(d -ebp)]2−. While the overall fcc structure in [ 2 ](NO3) was similar to that of [ 1 ](NO3)2, none of the nitrate anions were accommodated in any hydrophobic tetrahedral interstice, reflecting the difference in the complex charges between [ 1 ]2+ and [ 2 ]+. 相似文献
96.
Formation,Expansion, and Interconversion of Metallarings in a Sulfur‐Bridged AuICoIII Coordination System
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Katsuya Oji Dr. Asako Igashira‐Kamiyama Dr. Nobuto Yoshinari Prof. Takumi Konno 《Angewandte Chemie (International ed. in English)》2014,53(7):1992-1996
A novel AuICoIII coordination system that is derived from the newly prepared [Co(D ‐nmp)2]? ( 1 ?; D ‐nmp=N‐methyl‐D ‐penicillaminate) and a gold(I) precursor AuI is reported. Complex 1 ? acts as a sulfur‐donating metallaligand and reacts with the gold(I) precursor to give [Au2Co2(D ‐nmp)4] ( 2 ), which has an eight‐membered AuI2CoIII2 metallaring. Treatment of 2 with [Au2(dppe)2]2+ (dppe=1,2‐bis(diphenylphosphino)ethane) leads to the formation of [Au4Co2(dppe)2(D ‐nmp)4]2+ ( 3 2+), which consists of an 18‐membered AuI4CoIII2 metallaring that accommodates a tetrahedral anion (BF4?, ClO4?, ReO4?). In solution, the metallaring structure of 3 2+ is readily interconvertible with the nine‐membered AuI2CoIII metallaring structure of [Au2Co(dppe)(D ‐nmp)2]+ ( 4 +); this process depends on external factors, such as solvent, concentration, and nature of the counteranion. These results reveal the lability of the Au? S and Au? P bonds, which is essential for metallaring expansion and contraction. 相似文献
97.
Nobuto Yoshinari Natthaya Meundaeng Hiroyasu Tabe Yusuke Yamada Satoshi Yamashita Yasuhiro Nakazawa Takumi Konno 《Angewandte Chemie (International ed. in English)》2020,59(41):18048-18053
Postsynthetic installation of lanthanide cubanes into a metallosupramolecular framework via a single‐crystal‐to‐single‐crystal (SCSC) transformation is presented. Soaking single crystals of K6[Rh4Zn4O(l ‐cys)12] (K6[ 1 ]; l ‐H2cys=l ‐cysteine) in a water/ethanol solution containing Ln(OAc)3 (Ln3+=lanthanide ion) results in the exchange of K+ by Ln3+ with retention of the single crystallinity, producing Ln2[ 1 ] ( 2Ln ) and Ln0.33[Ln4(OH)4(OAc)3(H2O)7][ 1 ] ( 3Ln ) for early and late lanthanides, respectively. While the Ln3+ ions in 2Ln exist as disordered aqua species, those in 3Ln form ordered hydroxide‐bridged cubane clusters that connect [ 1 ]6? anions in a 3D metal‐organic framework through coordination bonds with carboxylate groups. This study shows the utility of an anionic metallosupramolecular framework with carboxylate groups for the creation of a series of metal cubanes that have great potential for various applications, such as magnetic materials and heterogeneous catalysts. 相似文献
98.
A simple method to detect audible echoes is proposed as an objective criterion for room acoustics. This method evaluates the perceptibility of sound reflections that are generated by an impulsive sound source and identifies from reflectograms harmful reflections perceived as echoes. Particularly with this method, the masking effect of reverberation is taken into consideration, which cannot be treated sufficiently by the existing objective criteria. The applicability to room acoustical design is verified by evaluating the impulse responses measured in real halls where audible echoes occurred. It is shown that the proposed method detects audible echoes at an accuracy of more than 90% and would be suitable for practical use. 相似文献
99.
Nobuyuki Uematsu Nobuto Hoshi Takehiro Koga Masanori Ikeda 《Journal of fluorine chemistry》2006,127(8):1087-1095
The novel perfluorosulfonamide monomers and their preparation methods have been developed. The ternary-copolymer membranes, utilizing the perfluorosulfonamide monomers as the cross-linking site, can be efficiently converted to the cross-linked membranes with the strictly controlled structure. The novel cross-linking method has proved to be effective for the improvement of the mechanical properties at high temperature, while keeping its high proton conductivity. 相似文献
100.
Here, we report an iridium(III) coordination system with 2‐aminoethanethiolate (aet), which shows the formation of S?H???S hydrogen and S?S disulfide bonds in a controlled manner. Treatment of fac‐[Ir(aet)3] with aqueous HBF4 under aerobic conditions gave dinuclear [Ir2(aet)4(cysta)]2+ ([ 1 ]2+; cysta=cystamine) with a single S?S disulfide bond, while dimeric [Ir2(aet)3(Haet)3](BF4)3 ([ 2 ](BF4)3) with a triple S?H???S hydrogen bond was formed by similar treatment under anaerobic conditions. Upon exposure to air, [ 2 ]3+ was converted to dinuclear [Ir2(aet)2(Haet)2(cysta)]4+ ([ 3 ]4+), in which two IrIII centers are spanned by a double S?H???S hydrogen bond and a single S?S disulfide bond. Complex [ 3 ]4+ was interconvertible with [ 1 ]2+ via the removal/addition of protons on S donors, accompanied by the intermolecular exchange of the fac‐[Ir(aet)3] units. Complexes [ 1 ]2+, [ 2 ]3+, and [ 3 ]4+, isolated as BF4? salts, were fully characterized by single‐crystal X‐ray crystallography. 相似文献