Burazer, Sanja; Molčanov, Krešimir; Šantić, Ana; Klaser, Teodoro; Wenger, Emmanuel; Pajić, Damir; Jagličić, Zvonko; Popović, Jasminka; Jurić, Marijana (2021) Humidity-Sensing Properties of an 1D Antiferromagnetic Oxalate-Bridged Coordination Polymer of Iron(III) and Its Temperature-Induced Structural Flexibility. Materials, 14 . pp. 5543-5555. ISSN 1996-1944
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Abstract
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 (W·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)]nn− 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.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | oxalate-bridged coordination polymers ; alkyl ammonium cations ; single-crystal-to-singlecrystal transformations ; proton conductivity ; humidity-sensing property ; antiferromagnetic spin chain | ||||||||
| Subjects: | NATURAL SCIENCES > Physics | ||||||||
| Divisions: | Division of Materials Chemistry Division of Materials Physics Division of Physical Chemistry |
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| Depositing User: | Marijana Jurić | ||||||||
| Date Deposited: | 09 Nov 2021 14:35 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/6601 | ||||||||
| DOI: | 10.3390/ma14195543 |
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