20.500.12556/RUL-142038 Humidity-sensing properties of an 1D antiferromagnetic oxalate-bridged coordination polymer of iron(III) and its temperature-induced structural flexibility 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. oxalate-bridged coordination polymers alkyl ammonium cations single-crystal-to-singlecrystal transformations proton conductivity humidity-sensing property antiferromagnetic spin chain koordinacijski polimeri protonska prevodnost detektor vlažnosti" antiferomagnetna spinska veriga true false true Angleški jezik Slovenski jezik Članek v reviji 2022-10-17 15:13:19 2022-10-17 15:13:24 2022-10-18 03:47:14 0000-00-00 00:00:00 2021 0 0 12 str. iss. 19, art. 5543 Vol. 14 Oct. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544 1996-1944 10.3390/ma14195543 124821763 materials-14-05543-v2.pdf materials-14-05543-v2.pdf 1 4DBDC83558CBB9365C896188C3375686 a7f6da78ca60974aa205d9b08a699969ffecd8b80fe9277deff962540935d320 2d1219e5-4e1e-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=163291 https://www.mdpi.com/1996-1944/14/19/5543 1 6e11630d-4e1d-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=163290 Fakulteta za gradbeništvo in geodezijo 0 0 0