Snap-Shots of a Reduction Pathway: The Reaction of WCl6 with Copper Powder

A combined differential scanning calorimetry (DSC)/X-ray diffraction (XRD) methodology is used to search and identify compounds in the Cu/W/Cl system based on the successive reaction of WCl6 with copper powder. Thermal effects monitored by DSC are used to detect reaction pathways and phase formations of compounds. A series of five new and one already known compounds is discovered as crystalline phases in the Cu/W/Cl system and structurally characterized by XRD. The reaction of WCl6 with elemental copper begins at temperatures as low as 60 °C with the formation of crystalline powders of α-CuxWCl6. Continuing reaction stages include the successive formation of crystalline phases β-CuxWCl6, γ-CuxWCl6, α-Cu2W2Cl10, β-Cu2W2Cl10, and Cu2[W6Cl14].

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