ChemInform Abstract: Crystal Structures and Properties of Two Sodides and an Electride.

Dawes, Steven B.; Ward, Donald L.; Fussa-Rydel, O.; Huang, Rui; Dye, James

doi:10.1002/chin.198937065

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“…The structure of Rb+(15C5)2,Na" has been determined by using single-crystal X-ray diffraction methods. 13 In this compound the rubidium cation is sandwiched between two 15-crown-5 rings and has as nearest neighbors 10 oxygen atoms from the crown rings (Rb-O, 2.99-3.07 A; average, 3.01 A). The cation is fully protected by the rings and has no contact with the anion.…”

Section: Resultsmentioning

confidence: 99%

“…The crystallographic data show that the distances between the rubidium cation and the oxygen atoms are not all equal. 13,19 In addition, in some cases more than one stable conformation for the crown ether is allowed, and this causes disorder in the complexation. This type of disorder has been observed in the structures of Rb+-(15C5)2,Na-13 and Cs+(15C5)2,T.31 The static contribution to the Debye-Waller factor can be estimated by eq 4 for N neighbors distance r0.…”

Section: Resultsmentioning

confidence: 99%

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Rubidium x-ray absorption (EXAFS and XANES) studies of Rb- and complexed Rb+ in alkalides and electrides

Fussa-Rydel¹,

Dye²,

Teo³

1988

J. Am. Chem. Soc.

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The Rb K-edge X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectra of compounds with stoichiometries RbNa(18C6), Rb(18C6), Rb2(18C6), RbNa(15C5)2, Rb(15C5)2, Rb(15C5), RbK(C222), CsRb(18C6)2, RbK(18C6), RbK(15C5)2, CsRb(15C5)2, Rb(C222), and Rb2(C222) have been measured and interpreted. The XANES spectra provide a means of identifying the oxidation state of the rubidium-containing species in these salts. The compounds Cs+(18C6)2,Rb", K+(C222),Rb", and Cs+(15C5)2,Rb" are pure rubidides. They show no detectable EXAFS, consistent with the large size of Rb". The spectra of Rb+(18C6),Na", Rb+(15C5)2,Na", Rb+(15C5)2,e", and Rb+(C222),e" are similar to (but not identical with) those of the model compounds Rb+(18C6),Br"2H2Ó and Rb+(18C6)SCN". The compounds Rb+(15C5)2,Rb", Rb+(18C6),Rb", Rb(18C6), Rb+(C222),Rb", RbK(18C6), and RbK(15C5)2,e" are mixtures that contain both the complexed rubidium cation and the rubidide anion. The EXAFS data for Rb+(15C5)2,e" and Rb+(15C5)2,Rb" indicate local structures around the rubidium cation similar to that of Rb+( 15C5)2,Na", a sodide whose crystal structure has been determined by X-ray diffraction. The radial distribution functions of the compounds Rb+(18C6),X" indicate different conformations of the 18-crown-6 ring in different salts.A number of compounds that contain novel types of anionic species have been synthesized in our laboratory.1"4 Alkalides

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%