Figure 1. a) 2, 2’-bipyridyl-4, 4’-dicarboxylic acid ligand in Mn-bpdc MOF; b) Local coordination geometry of the central Mn metal atoms; c) The 3D structure and connolly surface of Mn-bpdc MOF front view of the structure along the c axis; d)The one-dimensional channels of Mn-bpdc MOF. The inner and external surfaces are lilac and grey, respectively. Color codes: Grey violet, red, dark blue, and gray nodes represent manganese metal, oxygen, nitrogen and carbon atoms, respectively.
The Mn-bpdc MOF was synthesized by hydrothermal method through the reaction of commercially available 2,2’-bipyridine-4,4’-dicarboxylic acid ligand (H2BPDC) and manganese sulfate.43 The experimental PXRD pattern of the as-synthesized Mn-based MOF is accorded with the simulated ones, revealing the successful synthesis of Mn-bpdc MOF (Figure S1 ). The framework of Mn-bpdc consists of infinite chains of corner-sharing Mn(II) centers connected with two nitrogen atoms from bipyridyl and four oxygen atoms from carboxylic of BPDC ligands, possessing uniform one dimensional channels (Figure 1a-d ). The scanning electron microscopy (SEM) of Mn-bpdc MOF is showed in Figure S2, which reveals that the Mn-bpdc MOF has rod-shaped laminated microstructures.