The glass transition temperatures of melting mixtures of metal–organic frameworks (MOFs) and phenanthroline are lowered through transient coordination, enabling melt-quenched vitrification of previously unmeltable MOFs. This is a preview of subscription content, access via your institution Access options Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription $32.99 / 30 days cancel any time Subscribe to this journal Receive 12 print issues...