ZERO THERMAL EXPANSION

Zero thermal expansion in a flexible, stable framework: Tetramethylammonium copper(I) zinc(II) cyanide
A E Phillips, G J Halder, K W Chapman, A L Goodwin and C J Kepert
J Am Chem Soc 132, 10–11 (2010)

Tetramethylammonium copper(I) zinc(II) cyanide, which consists of N(CH3)4+ ions trapped within a cristobalite-like metal cyanide framework, has been studied by variable-temperature powder and single-crystal X-ray diffraction. Its coefficient of thermal expansion is approximately zero over the temperature range 200−400 K and comparable with the best commercial zero thermal expansion materials. The atomic displacement parameters, apparent bond lengths, and structure of a low-temperature, low-symmetry phase reveal that the low-energy vibrational modes responsible for this behavior maintain approximately rigid Zn coordination tetrahedra but involve significant distortion of their Cu counterparts.

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