The order-disorder state of diaminoalkanes in Cu-based metal-organic materials

Abstract

Two novel metal-organic compounds, [NH₃(CH₂)_nNH₃][Cu₂(HCOO)₄Cl₂], where n = 3,4, have been investigated by X-ray diffraction and spectroscopic methods to determine the interactions in the crystal and their influence on the molecular arrangement. The disorder found in the n = 3 crystal is of static nature as it has been confirmed by IR and Raman spectroscopy. It has also been suggested that the copper paddle-wheel pyramids can accommodate the conformation of the 1,3-diaminopropane cations through rotary motion.

Keywords:

• Copper
• formate
• diaminopropane
• diaminobutane
• crystal structure
• infrared
• Raman
• disorder