Issue 4, 1999
From the journal:

Journal of the Chemical Society, Dalton Transactions

Crystal architecture of the cocrystalline salt [Ru(η5-C5H5)(η6-trans-PhCH[double bond, length half m-dash]CHPh)][PF6]·0.5trans-PhCH[double bond, length half m-dash]CHPh and the reversible order–disorder phase transition in [Ru(η5-C5H5)(η6-C6H6)][PF6]

Fabrizia Grepioni,   Gianna Cojazzi,   Dario Braga,   Elisabeth Marseglia,   Laura Scaccianoce  and  Brian F. G. Johnson  

Abstract

The crystal architecture, stability and behaviour with temperature of the hexafluorophosphate salts [Ru(η5-C5H5)(η6-arene)]+ (arene = benzene 1 or trans-stilbene 2) have been investigated by variable temperature X-ray diffraction and differential scanning calorimetry. Compound 1 shows a reversible high temperature phase transition to a semi-disordered phase at 332 K. It is pseudo-isomorphous with [Cr(η6-C6H6)2][PF6] and with the room temperature form of [M(η5-C5H5)2][PF6] (M = Co or Fe), the latter species also undergoing reversible phase transitions. Crystalline 2 has been characterised in its cocrystallised form [Ru(η5-C5H5)(η6-trans-PhCH[double bond, length half m-dash]CHPh)]- [PF6]·0.5trans-PhCH[double bond, length half m-dash]CHPh. The trans-stilbene molecules fill in the voids formed in the packing when the small [PF6]– anions assemble with the large and asymmetric [Ru(η5-C5H5)(η6-trans-PhCH[double bond, length half m-dash]CHPh)]+ cations. The role of charge assisted C–H(δ+) · · · F(δ–) interactions is discussed.

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Article information

DOI
https://doi.org/10.1039/A808278B
Article type
Paper

J. Chem. Soc., Dalton Trans., 1999, 553-558

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Crystal architecture of the cocrystalline salt [Ru(η5-C5H5)(η6-trans-PhCH[double bond, length half m-dash]CHPh)][PF6]·0.5trans-PhCH[double bond, length half m-dash]CHPh and the reversible order–disorder phase transition in [Ru(η5-C5H5)(η6-C6H6)][PF6]

F. Grepioni, G. Cojazzi, D. Braga, E. Marseglia, L. Scaccianoce and B. F. G. Johnson, J. Chem. Soc., Dalton Trans., 1999, 553 DOI: 10.1039/A808278B

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