Naslov
Humidity-Sensing Properties of an 1D Antiferromagnetic Oxalate-Bridged Coordination Polymer of Iron(III) and Its Temperature-Induced Structural Flexibility

Autori
Burazer, Sanja ; Molčanov, Krešimir ; Šantić, Ana ; Klaser, Teodoro ; Wenger, Emmanuel ; Pajić, Damir ; Jagličić, Zvonko ; Popović, Jasminka ; Jurić, Marijana

Izvornik
Materials (1996-1944) 14 (2021); 5543-5555

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
oxalate-bridged coordination polymers ; alkyl ammonium cations ; single-crystal-to-singlecrystal transformations ; proton conductivity ; humidity-sensing property ; antiferromagnetic spin chain

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA