title: Increase in Electrical Conductivity of MOF to Billion-Fold upon Filling the Nanochannels with Conducting Polymer.
abstract: Redox-active pyrrole (Py) monomers were intercalated into 1D nanochannels of [Cd(NDC)0.5(PCA)]·Gx (H2NDC = 2,6-napthalenedicarboxylic acid, HPCA = 4-pyridinecarboxylic acid, G = guest molecules) (1) - a fluorescent 3D MOF (λem = 385 nm). Subsequent activation of 1⊃Py upon immersing into iodine (I2) solution resulted in an increment of the bulk electrical conductivity by ∼9 orders of magnitude. The unusual increase in conductivity was attributed to the formation of highly oriented and conducting polypyrrole (PPy) chains inside 1D nanochannels and specific host-guest interaction in 1⊃PPy thereof. The Hall-effect measurements suggested 1⊃PPy to be an n-type semiconductor material with remarkably high-carrier density (η) of ∼1.5 × 10(17) cm(-3) and mobility (μ) of ∼8.15 cm(2) V(-1) s(-1). The fluorescence property of 1 was almost retained in 1⊃PPy with concomitant exciplex-type emission at higher wavelength (λem = 520 nm). The here-presented results on [MOF⊃Conducting Polymer] systems in general will serve as a prototype experiment toward rational design for the development of highly conductive yet fluorescent MOF-based materials for various optoelectronic applications.
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Barun
authors.initials: B
authors.lastname: Dhara
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Sanjog S
authors.initials: SS
authors.lastname: Nagarkar
authors.affiliation: Department of Physics, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Jitender
authors.initials: J
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Vikash
authors.initials: V
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Plawan Kumar
authors.initials: PK
authors.lastname: Jha
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Sujit K
authors.initials: SK
authors.lastname: Ghosh
authors.affiliation: Department of Physics, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Sunil
authors.initials: S
authors.lastname: Nair
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pashan, Pune 411008, India.
authors.forename: Nirmalya
authors.initials: N
authors.lastname: Ballav