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Gold(I,III) chloride
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<h2 id="synthesis">Synthesis</h2> <p>According to the procedure by <a href="/facts/Fausto_Calderazzo/SfKn2Qmr">Calderazzo</a> et al., gold(I,III) chloride may be prepared by the reaction of <a href="/facts/Gold(III)_chloride/YeLH5Dbr">gold(III) chloride</a> with gold carbonyl chloride<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> or <a href="/facts/Carbon_monoxide/CKuLtEMJ">carbon monoxide</a><a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> at room temperature in <a href="/facts/Thionyl_chloride/nWwvNtvd">thionyl chloride</a>. </p> Au2(CO)Cl4 + Au2Cl6 → COCl2 + Au4Cl8 2 Au2Cl6 + 2 CO → Au4Cl8 + 2 COCl2 <h2 id="structure-and-properties">Structure and properties</h2> <p>Single crystals of gold(I,III) chloride are triclinic with a <i>P</i>1 <a href="/facts/Space_group/2XQx0J7M">space group</a> and consist of discrete Au4Cl8 molecules with idealised C2h <a href="/facts/Molecular_symmetry/BrDxAkTK">symmetry</a>.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> Within this the Au(I) centers are linearly coordinated with a Cl-Au-Cl bond angle of 175.0° (close to the ideal value of 180°) and an average bond length of 2.30 <a href="/facts/Angstrom/T5mjdd97">Å</a>. The Au(III) centers adopt a slightly irregular square-planar conformation with the Au-Cl bond lengths for <a href="/facts/Bridging_ligand/E4ytba8I">bridging</a> chlorides (2.33 Å) being slightly longer than those of terminal chlorides (2.24 Å). </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Dell'Amico, Daniela Belli; Calderazzo, Fausto; Marchetti, Fabio; Merlino, Stefano; Perego, Giovanni (1977). "X-Ray crystal and molecular structure of Au4Cl8, the product of the reduction of Au2Cl6 by Au(CO)Cl". Journal of the Chemical Society, Chemical Communications (1): 31. doi:10.1039/C39770000031. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Dell'Amico, Daniela Belli; Calderazzo, Fausto; Marchetti, Fabio; Merlino, Stefano (1982). "Synthesis and molecular structure of [Au4Cl8], and the isolation of [Pt(CO)Cl5]− in thionyl chloride". Journal of the Chemical Society, Dalton Transactions (11): 2257. doi:10.1039/DT9820002257. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Dell'Amico, Daniela Belli; Calderazzo, Fausto; Marchetti, Fabio; Merlino, Stefano; Perego, Giovanni (1977). "X-Ray crystal and molecular structure of Au4Cl8, the product of the reduction of Au2Cl6 by Au(CO)Cl". Journal of the Chemical Society, Chemical Communications (1): 31. doi:10.1039/C39770000031. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>