Povzetek
: 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.
Ključne besede
koordinacijski polimeri;protonska prevodnost;detektor vlažnosti",;antiferomagnetna spinska veriga;oxalate-bridged coordination polymers;alkyl ammonium cations;single-crystal-to-singlecrystal transformations;proton conductivity;humidity-sensing property;antiferromagnetic spin chain;
Podatki
Jezik: |
Angleški jezik |
Leto izida: |
2021 |
Tipologija: |
1.01 - Izvirni znanstveni članek |
Organizacija: |
UL FGG - Fakulteta za gradbeništvo in geodezijo |
UDK: |
544 |
COBISS: |
124821763
|
ISSN: |
1996-1944 |
Št. ogledov: |
13 |
Št. prenosov: |
3 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Slovenski jezik |
Sekundarne ključne besede: |
koordinacijski polimeri;protonska prevodnost;detektor vlažnosti";antiferomagnetna spinska veriga; |
Vrsta dela (COBISS): |
Članek v reviji |
Strani: |
12 str. |
Letnik: |
ǂVol. ǂ14 |
Zvezek: |
ǂiss. ǂ19, art. 5543 |
Čas izdaje: |
Oct. 2021 |
DOI: |
10.3390/ma14195543 |
ID: |
16777971 |