Improved synthesis of trigone trimer cluster metal organic framework MIL-100Al by a later entry of methyl groups.

Later entry of methyl or ethyl groups was carried out for the economical synthesis of trigone trimer cluster MIL-100Al oriented from H3BTC directly. The pure phase MIL-100Al was obtained in a DMF aqueous solution, and equal amounts of methyl and carboxyl groups are the key for the successful synthesis of MIL-100Al.