Low temperature synthesis study of metal-organic framework CPO-27: investigating metal, solvent and base effects down to -78 °C

Simon M Vornholt; Susan E Henkelis; Russell E Morris

doi:10.1039/c7dt01223c

Low temperature synthesis study of metal-organic framework CPO-27: investigating metal, solvent and base effects down to -78 °C

Dalton Trans. 2017 Jun 27;46(25):8298-8303. doi: 10.1039/c7dt01223c.

Authors

Simon M Vornholt¹, Susan E Henkelis, Russell E Morris

Affiliation

¹ School of Chemistry, Purdie Building, North Haugh, St Andrews, Fife KY16 9ST, UK. seh24@st-andrews.ac.uk.

PMID: 28621359
DOI: 10.1039/c7dt01223c

Abstract

CPO-27-M (M = Co, Mg, Ni, Zn) metal-organic frameworks have been successfully synthesized at temperatures down to -78 °C in a range of solvent systems and their crystallinity and morphology analyzed by powder X-ray diffraction and scanning electron microscopy. CPO-27-Mg and -Zn could be synthesized at lower temperatures using MeOH-NaOH as the solvent with CPO-27-Zn showing the most crystalline material at -78 °C. CPO-27-Zn afforded the most crystalline samples of all studies in MeOH-TEA. However, in MeOH a non-porous monomeric [Zn(H₂dhtp)(H₂O)₂] complex was formed when no base was present. In THF with base (NaOH, TEA) the reaction produced crystalline MOFs in a controlled and stable manner at low temperatures, whilst the reagents were insoluble in THF at low temperature when no base was present. SEM was used to analyze the morphologies of the products.