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  • Humidity-sensing properties of an 1D antiferromagnetic oxalate-bridged coordination polymer of iron(III) and its temperature-induced structural flexibility [Elektronski vir]
    Burazer, Sanja ...
    : A novel one-dimensional (1D) oxalate-bridged coordination polymer of iron(III), {[NH(CH3 ) (C2H5 )2 ][FeCl2 (C2O4 )]}n (1), exhibits remarkable humidity-sensing properties and very high proton ... conductivity at room temperature (2.70 × 10−4 (Ω·cm)−1 at 298 K under 93% relative humidity), in addition to the independent antiferromagnetic spin chains of iron(III) ions bridged by oxalate groups (J = −7.58(9) cm−1 ). Moreover, the time-dependent measurements show that 1 could maintain a stable proton conductivity for at least 12 h. Charge transport and magnetic properties were investigated by impedance spectroscopy and magnetization measurements, respectively. Compound 1 consists of infinite anionic zig-zag chains [FeCl2 (C2O4 )]n n− and interposed diethylmethylammonium cations (C2H5 )2 (CH3 )NH+ , which act as hydrogen bond donors toward carbonyl oxygen atoms. Extraordinarily, the studied coordination polymer exhibits two reversible phase transitions: from the high-temperature phase HT to the mid-temperature phase MT at T ~213 K and from the mid-temperature phase MT to the low-temperature phase LT at T ~120 K, as revealed by in situ powder and single-crystal X-ray diffraction. All three polymorphs show large linear thermal expansion coefficients.
    Vir: Materials [Elektronski vir]. - ISSN 1996-1944 (Vol. 14, iss. 19, art. 5543, Oct. 2021, 12 str.)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2021
    Jezik - angleški
    COBISS.SI-ID - 124821763

    Povezava(-e):

    https://www.mdpi.com/1996-1944/14/19/5543
    Repozitorij Univerze v Ljubljani – RUL
    DOI

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