英语词汇“arachno”的英英意思、用法、释义、翻译、读音、例句、短语、词组、英语词典-本地帮

单词

arachno

释义

arachno, a. Chem.|əˈræknəʊ|
Usu. italicized.
[f. Gr. ἀράχν-η spider + -o¹.]
Designating (the structure of) a boron compound in whose molecules boron atoms occupy all vertices but two of a notional triangulated polyhedron. Also (with hyphen) as a word-forming element.
1971Inorg. Chem. X. 214/2 Of the many icosahedral fragment arachno structures which may be imagined the simple removal of a high-coordination vertex from the open face of the related nido structure empirically yields the correct or presumed to be correct structure in every case.1984Greenwood & Earnshaw Chem. of Elements (1986) vi. 185 Arachno-boranes: B_nH_n₊₆ , n corners of an (n+2) cornered polyhedron.1988Jrnl. Chem. Soc.: Dalton Trans. 1467/1 The factors that influence nuclear magnetic shielding in polyhedral boron compounds are not understood, and few reliable structure-shielding correlations that are useful in the general case have emerged. An exception to this generalization is in the C₂_v open ten-vertex cluster type..in which a change from nido character, exemplified by B₁₀H₁₄ , to arachno character, exemplified by [B₁₀H₁₄]^2- is characterized by an inversion of the ordering of the ¹¹B resonance positions and an increase in the mean ¹¹B shielding of several p.p.m.

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