摘要:

AbstractCyclobutadiene has recently become the center of reawakened interest. By use of the matrix isolation technique, cyclobutadienes can now be prepared as monomers frozen in matrices. Thus both the unsubstituted parent compound and its alkyl‐substituted derivatives are amenable to study. The present progress report surveys the entire field; however, particular emphasis is placed on the author's own results from investigations concerning this classical problem of organic chemistr

ISSN:0570-0833    

DOI:10.1002/anie.197404251

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractAn understanding of the physical and chemical phenomena and the structure of salt melts calls not only for kinetic and spectroscopic data but also for systematic studies on the equilibrium and transport properties of individual systems. The present article deals with the activity coefficients, transport numbers, and self‐diffusion and interdiffusion coefficients of salt melts, and the results of consistent measurements of these quantities are reporte

ISSN:0570-0833    

DOI:10.1002/anie.197404381

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractAt high temperatures and pressures, liquid and gaseous metals exhibit a steady transition from metallic to nonmetallic behavior when the density is sufficiently reduced. All the properties are influenced by this transition, as is shown by measurement (on mercury, cesium, and potassium) of the electric conductivity, the density, the thermoelectric power, and in some cases the Hall effect, as well as the optical absorption. The continuous variation of the density over a wide range is achieved by compression or expansion above the critical temperatures of the metals, i. e. 14900C for mercury, 17500C for cesium, and 19250C for potassium.

ISSN:0570-0833    

DOI:10.1002/anie.197404461

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractThe most recent spectroscopic method that can be applied to chemical problems is X‐ray absorption spectroscopy, in which the excitation of individual core electrons of an atom is studied. The analysis of the spectra with the aid of simple theoretical models yields information both about the core orbitals of the atom and about the unoccupied molecular orbitals, from which various molecular properties can be deduced. These not only include charge distribution, electronic configuration, geometry, and spatial and energy characteristics of orbitals of the molecule under investigation; one can also obtain parameters of radicals (such as stability, bond length, ionization potential, and electronic excitation energy) that differ from the molecule under investigation in that the nuclear charge of one atom is one unit highe

ISSN:0570-0833    

DOI:10.1002/anie.197404541

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197404651

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197404661

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197404672

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197404681

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197404691

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.197404701

出版商:Hüthig&Wepf Verlag    

年代:1974

数据来源: WILEY