Document Type

Article

Original Publication Date

2017

Journal/Book/Conference Title

Journal of Materials Chemistry C

Volume

2017

Issue

5

DOI of Original Publication

10.1039/c6tc03577a

Comments

Originally published at http://dx.doi.org/10.1039/c6tc03577a

Date of Submission

June 2017

Abstract

We have systematically studied a series of eight metal-organic frameworks (MOFs) in which the secondary building unit is a manganese trimer cluster, and the linkers are differently substituted benzene dicarboxylic acids (BDC). The optical band gap energy of the compounds vary from 2.62 eV to 3.57 eV, and theoretical studies find that different functional groups result in new states in the conduction band, which lie in the gap and lower the optical band gap energy. The optical absorption between the filled Mn 3d states and the ligands is weak due to minimal overlap of the states, and the measured optical band gap energy is due to transitions on the BDC linker. The Mn atoms in the MOFs have local moments of 5 mu B, and selected MOFs are found to be antiferromagnetic, with weak coupling between the cluster units, and paramagnetic above 10 K.

Rights

This journal is © The Royal Society of Chemistry 2017

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