• Castilloblas, Celia
• Bennett, Thomas D.
• Knebel, Alexander
• Wondraczek, Lothar
• Azar, Ayda Nemati Vesali
• Steele, James
• Kono, Ayano
• Chater, Philip A.
• Robertson, Georgina P.
• Oschatz, Martin
• Nozari, Vahid
• Leónalcaide, Luis
• Ashling, Christopher W.
• Sajzew, Roman
• Keen, David A.

Abstract

<jats:title>Abstract</jats:title><jats:p>Metal‐organic framework (MOF) composite materials containing ionic liquids (ILs) have been proposed for a range of potential applications, including gas separation, ion conduction, and hybrid glass formation. Here, an order transition in an IL@MOF composite is discovered using CuBTC (copper benzene‐1,3,5‐tricarboxylate) and [EMIM][TFSI] (1‐ethyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide). This transition – absent for the bare MOF or IL – provides an extended super‐cooling range and latent heat at a capacity similar to that of soft paraffins, in the temperature range of ≈220 °C. Structural analysis and in situ monitoring indicate an electrostatic interaction between the IL molecules and the Cu paddle‐wheels, leading to a decrease in pore symmetry at low temperature. These interactions are reversibly released above the transition temperature, which reflects in a volume expansion of the MOF‐IL composite.</jats:p>

Topics

• nanocomposite
• impedance spectroscopy
• pore
• phase
• glass
• glass
• copper