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Keywords = main group element–transition metal clusters

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26 pages, 4692 KiB  
Review
Chemical Bonding and Physical Properties in Quasicrystals and Their Related Approximant Phases: Known Facts and Current Perspectives
by Enrique Maciá Barber
Appl. Sci. 2019, 9(10), 2132; https://doi.org/10.3390/app9102132 - 24 May 2019
Cited by 18 | Viewed by 6963
Abstract
Quasicrystals are a class of ordered solids made of typical metallic atoms but they do not exhibit the physical properties that usually signal the presence of metallic bonding, and their electrical and thermal transport properties resemble a more semiconductor-like than metallic character. In [...] Read more.
Quasicrystals are a class of ordered solids made of typical metallic atoms but they do not exhibit the physical properties that usually signal the presence of metallic bonding, and their electrical and thermal transport properties resemble a more semiconductor-like than metallic character. In this paper I first review a number of experimental results and numerical simulations suggesting that the origin of the unusual properties of these compounds can be traced back to two main features. For one thing, we have the formation of covalent bonds among certain atoms grouped into clusters at a local scale. Thus, the nature of chemical bonding among certain constituent atoms should play a significant role in the onset of non-metallic physical properties of quasicrystals bearing transition-metal elements. On the other hand, the self-similar symmetry of the underlying structure gives rise to the presence of an extended chemical bonding network due to a hierarchical nesting of clusters. This novel structural design leads to the existence of quite diverse wave functions, whose transmission characteristics range from extended to almost localized ones. Finally, the potential of quasicrystals as thermoelectric materials is discussed on the basis of their specific transport properties. Full article
(This article belongs to the Section Chemical and Molecular Sciences)
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18 pages, 6748 KiB  
Review
Coordinated “Naked” Pnicogenes and Catalysis
by Anna Vízi-Orosz, Gergely Berzeviczy and Gyula Pályi
Catalysts 2018, 8(12), 583; https://doi.org/10.3390/catal8120583 - 26 Nov 2018
Cited by 1 | Viewed by 4506
Abstract
Diphosphorous (P2) side-on coordinated to a dicobalt (Co–Co) moiety was described 45 years ago. This discovery had several links to actual problems of homogeneous molecular catalysis. The new type of organometallic complexes induced several ingenious new ramifications in main-group/transition metal cluster [...] Read more.
Diphosphorous (P2) side-on coordinated to a dicobalt (Co–Co) moiety was described 45 years ago. This discovery had several links to actual problems of homogeneous molecular catalysis. The new type of organometallic complexes induced several ingenious new ramifications in main-group/transition metal cluster chemistry in the last decades. The present review traces the main lines of these research results and their contacts to actual problems of industrial catalysis. Full article
(This article belongs to the Special Issue Coordination Chemistry and Catalysis)
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