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

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5543
Author(s):  
Sanja Burazer ◽  
Krešimir Molčanov ◽  
Ana Šantić ◽  
Teodoro Klaser ◽  
Emmanuel Wenger ◽  
...  

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)]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.

1989 ◽  
Vol 100 (1) ◽  
pp. 135-141 ◽  
Author(s):  
A. I. Baranov ◽  
V. P. Khiznichenko ◽  
L. A. Shuvalov

2014 ◽  
Vol 2 (21) ◽  
pp. 7754 ◽  
Author(s):  
Rakesh K. Pandey ◽  
Md. Delwar Hossain ◽  
Satoshi Moriyama ◽  
Masayoshi Higuchi

2012 ◽  
Vol 66 (1) ◽  
pp. 19-21 ◽  
Author(s):  
Yan Xia ◽  
Teng Fei ◽  
Yuan He ◽  
Rui Wang ◽  
Fan Jiang ◽  
...  

2013 ◽  
Vol 48 (2) ◽  
pp. 790-794 ◽  
Author(s):  
Xing Zhang ◽  
Hai Ming ◽  
Ruihua Liu ◽  
Xiao Han ◽  
Zhenhui Kang ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document