在柔性、稳定骨架中实现零热膨胀：四甲基碘化亚铜锌氰化物。

Zero thermal expansion in a flexible, stable framework: tetramethylammonium copper(I) zinc(II) cyanide.

机构信息

School of Chemistry, The University of Sydney, NSW 2006, Australia.

出版信息

J Am Chem Soc. 2010 Jan 13;132(1):10-1. doi: 10.1021/ja906895j.

PMID:20014833

Abstract

Tetramethylammonium copper(I) zinc(II) cyanide, which consists of N(CH(3))(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.

摘要

四甲基铵铜（I）锌（II）氰化物，由 N(CH(3))(4)(+) 离子被困在类似方石英的金属氰化物骨架内，通过变温粉末和单晶 X 射线衍射进行了研究。其热膨胀系数在 200-400 K 温度范围内接近零，与最好的商业零热膨胀材料相当。低温、低对称相的原子位移参数、表观键长和结构表明，导致这种行为的低能振动模式保持了 Zn 配位四面体的大致刚性，但涉及到它们 Cu 对应物的显著变形。