title: Sulfonic Group Functionalized Mixed Ligand Coordination Polymers: Synthesis, Characterization, Water Sorption, and Proton Conduction Studies.
abstract: Five sulfonic acid group functionalized mixed ligand coordination polymers (CPs), namely, {[Zn(bpeH)(5-sip)(H2O)]·(H2O)}n(1), {[Cu(pyz)(5-Hsip)(H2O)2]·(H2O)2}n(2), {[Cu(bpee)0.5(5-sip)(H2O)2]·(H2O)4(bpeeH2)0.5}n(3), {[Cu(bpy)(5-Hsip)(H2O)]·(H2O)2}n(4), and {[Cu(bpy)2(5-H2sip)2]·(H2O)6}n(5) [where sip3-= 5-sulfoisophthalate; bpe = 4,4'-bispyridylethane; pyz = pyrazine; bpee = 4,4'-bispyridylethylene; bpy = 4,4'-bipyridine], have been synthesized with varying different N,N'-donor linkers using slow diffusion techniques at room temperature. The CPs possess guest water filled 1D channels and noncoordinating sulfonic acid or coordinated sulfonate groups, which are interconnected by means of extended intermolecular H-bonding interaction, which supports the humidity dependent proton conductivity of the samples. Under 95% relative humidity (% RH), the CPs exhibit the temperature dependent proton conductivity which is maximum up to in the range of ∼10-5-10-6S cm-1at 65 °C. In most of the cases, the framework shows activation energies with the value ranging from 0.35 to 0.54 eV, suggesting mostly the contribution of the Grotthuss mechanism of the proton conductivity.
authors.affiliation: Department of Chemistry, Jadavpur University , Jadavpur, Kolkata, 700 032, India.
authors.forename: Dilip Kumar
authors.initials: DK
authors.lastname: Maity
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Otake
authors.affiliation: Department of Chemistry, Jadavpur University , Jadavpur, Kolkata, 700 032, India.
authors.forename: Saheli
authors.initials: S
authors.lastname: Ghosh
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Hiroshi
authors.identifier: http://orcid.org/0000-0001-6955-3015
authors.initials: H
authors.lastname: Kitagawa
authors.affiliation: Department of Chemistry, Jadavpur University , Jadavpur, Kolkata, 700 032, India.
authors.forename: Debajyoti
authors.identifier: http://orcid.org/0000-0001-8820-8209
authors.initials: D
authors.lastname: Ghoshal