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Issue 5, 2016
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Modulating the electrical conductivity of metal–organic framework films with intercalated guest π-systems

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Abstract

The access to electroactive metal–organic frameworks (MOFs) and the ability to manipulate their electrical properties with external stimuli are vital for the realization of MOF-based electronic and photonic devices. To this end, we have constructed a new blue colored pillared-paddlewheel (PPW) MOF, namely BMOF composed of redox-active N,N′-bis(4-pyridyl)-2,6-dipyrrolidyl naphthalenediimide (BPDPNDI) pillars and 1,2,4,5-tetrakis-(4-carboxyphenyl)benzene (TCPB) struts, and grown stable, uniform BMOF films on ZnO substrates via a bottom-up method for device integration and testing. The electrical conductivity (σ) of BMOF films is ca. 6 × 10−5 S m−1 (25 °C), which surges up to 2.3 × 10−3 S m−1 upon infiltration of π-acidic methyl viologen (MV2+) guests, but remains unaffected by large C60 molecules that are size excluded. These results demonstrate for the first time that the conductivity of MOFs can be fine-tuned by complementary guest π-systems that can promote long-range electron delocalization by forming extended π-stacks with the redox-active ligands.

Graphical abstract: Modulating the electrical conductivity of metal–organic framework films with intercalated guest π-systems

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Publication details

The article was received on 22 Jul 2015, accepted on 09 Nov 2015 and first published on 10 Nov 2015


Article type: Communication
DOI: 10.1039/C5TC02232K
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J. Mater. Chem. C, 2016,4, 894-899

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    Modulating the electrical conductivity of metal–organic framework films with intercalated guest π-systems

    Z. Guo, D. K. Panda, K. Maity, D. Lindsey, T. G. Parker, T. E. Albrecht-Schmitt, J. L. Barreda-Esparza, P. Xiong, W. Zhou and S. Saha, J. Mater. Chem. C, 2016, 4, 894
    DOI: 10.1039/C5TC02232K

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