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221.
222.
A spectrophotometric study was conducted on solutions of benzo-15-crown-5, dibenzo-18-crown-6 and dibenzo-24-crown-8 with the -acceptors, DDQ, and CHL in dichloromethane at room temperature. The stabilities of the resulting charge transfer complexes with the -acceptors DDQ were found to decrease in the order DB18C6>DB15C5>DB24C8 and with CHL it follows the order DB18C6>DB24C8. The addition of either NaCl or KCl affects the values of formation constants (Kc) and the order of stabilities of the charge transfer complexes. The formation constants in the absence and presence of NaCl and KCl salts were calculated and discussed. 相似文献
223.
Thedelocalizedrs-electronicplanarstructureofthemoleculeisnecessarytodesignneworganicmetals.Recentlymuchattentionwaspaidontheuseofmuchrigidelectronwithdrawingl,3.4-oxadiazoleunitasbuildingblocksinthesynthesisofsyntheticmetalsandorganiclight-emittingdiodesmaterials'-'.Previouslywehavefoundthecon.lugatedmacrocyclecontainingl,3,4-oxadiazolecouldbeoxidativelydopedwithiodinetoformacharge-transfercomplexwithaconductivityof4.6x10-'scm-'.Tocontinuethisworkandunderstandtherelationshipsbetweenmoleculars… 相似文献
224.
The charge-transfer complexes of aromatic azides with diphenylamine (DPA) were studied. Irradiation of 4-nitrophenyl azide
in the presence of DPA was found not to give rise to the dissociation of the azido group in the azide radical anionvia intracomplex electron transfer. The photodissociation slows down due to both the static (the formation of a photostable complex
with diphenylamine) and dynamic quenching. When 4-azidoacetophenone is irradiated in the presence of DPA, the amine-sensitized
decomposition of azide and the photodecomposition of the azide—DPA complex occur along with the direct photolysis of azide,
which results in acceleration of the photodissociation due to an increase in the efficiency of the light absorption by the
reaction system. A possible sensitization of photodecomposition of aromatic azidesvia an electron transfer mechanism by irradiation of the azide-donor complex is shown. 相似文献
225.
Dr. Adrian Gainar Dr. Thanh-Loan Lai Dr. Cristina Oliveras-González Dr. Flavia Pop Dr. Matthieu Raynal Dr. Benjamin Isare Dr. Laurent Bouteiller Dr. Mathieu Linares Dr. David Canevet Dr. Narcis Avarvari Prof. Marc Sallé 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(7):2410-2420
Two-component organogels and xerogels based on a C3-symmetric pyrene-containing gelator have been deeply characterized through a wide range of techniques. Based on the formation of charge transfer complexes, the gelation phenomenon proved to be highly dependent on the nature of the electron poor dopant. This parameter significantly influenced the corresponding gelation domains, the critical gelation concentrations of acceptor dopants, the gel-to-sol transition temperatures, the microstructures formed in the xerogel state and their spectroscopic properties. In particular, titrations and variable-temperature UV–visible absorption spectroscopy demonstrated the key role of donor–acceptor interactions with a remarkable correlation between the phase transition temperatures and the disappearance of the characteristic charge transfer bands. The assignment of these electronic transitions was confirmed through time-dependent density functional theory (TD-DFT) calculations. Eventually, it was shown that the luminescent properties of these materials can be tuned with the temperature, either in intensity or emission wavelength. 相似文献
226.
A self-consistent calculation of electronic polarization in organic molecular crystals and thin films is presented in terms of charge redistribution in nonoverlapping molecules in a lattice. The polarization energies P+ and P− of a molecular cation and anion are found for anthracene and perelynetetracarboxylic dianhydride (PTCDA), together with binding energies of ion pairs and transport gaps of PTCDA films on metallic substrates. The 500 meV variation of P++P− with film thickness agrees with experiment, as do calculated dielectric tensors. Comparisons are made to submolecular calculations in crystals. 相似文献