title: Single crystal-to-single crystal site-selective postsynthetic metal exchange in a Zn-MOF based on semi-rigid tricarboxylic acid and access to bimetallic MOFs.
abstract: The metal ions in a neutral Zn-MOF constructed from tritopic triacid H3 L with inherent concave features, rigid core, and peripheral flexibility are found to exist in two distinct SBUs, that is, 0D and 1D. This has allowed site-selective postsynthetic metal exchange (PSME) to be investigated and reactivities of the metal ions in two different environments in coordination polymers to be contrasted for the first time. Site-selective transmetalation of Zn ions in the discrete environment is shown to occur in a single crystal-to-single crystal (SCSC) fashion, with metal ions such as Fe(3+) , Ru(3+) , Cu(2+) , Co(2+) , etc., whereas those that are part of 1D SBU sustain structural integrity, leading to novel bimetallic MOFs, which are inaccessible by conventional approaches. To the best of our knowledge, site-selective postsynthetic exchange of an intraframework metal ion in a MOF that contains metal ions in discrete as well as polymeric SBUs is heretofore unprecedented.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur-208016 (India), Fax: (+91) 512-2597436.
authors.forename: Alankriti
authors.initials: A
authors.lastname: Bajpai
authors.forename: Pujari
authors.initials: P
authors.lastname: Chandrasekhar
authors.forename: Savitha
authors.initials: S
authors.lastname: Govardhan
authors.forename: Rahul
authors.initials: R
authors.lastname: Banerjee
authors.forename: Jarugu Narasimha
authors.initials: JN
authors.lastname: Moorthy
keywords: X-ray crystallography; coordination polymers; metal-exchange; metal-organic frameworks; metathesis