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Synthesis, Characterization, and Magnetic Properties of Iron(II) Complex with 2,6-Bis(pyrazol-3-yl)pyridine Ligand and Tetracyanonickelate Anion
- Source :
- Indonesian Journal of Chemistry, Vol 23, Iss 4, Pp 1152-1160 (2023)
- Publication Year :
- 2023
- Publisher :
- Department of Chemistry, Universitas Gadjah Mada, 2023.
-
Abstract
- The complex containing iron(II), 2,6-bis(pyrazol-3-yl)pyridine (3-bpp) as ligand, and tetracyanonickelate as counter anion has been synthesized and characterized. The characterization data suggest the corresponding formula of [Fe(3-bpp)2][Ni(CN)4]·4H2O. Meanwhile, the SEM–EDX analysis image confirms the existence of all elements contained in the complex except the hydrogen atom. The infrared spectra exhibit vibration bands of the functional groups of 3-bpp ligand and [Ni(CN)4]−1 anion. From magnetic property measurement, the complex's molar magnetic susceptibility (XMT) value is 2.65 emu mol−1 K at 300 K, which contains about 75% high-spin state of the Fe(II) complex. Upon lowering the temperature, the XMT value gradually decreases around 1.37 emu mol−1 K at 13 K. It decreases sharply to about 0.73 emu mol−1 K at 2 K. These values reveal that Fe(II) complex is in the low-spin (LS) state. As a result, the complex exhibited spin-crossover characteristics of gradual transition without thermal hysteresis, and the transition temperature occurred below room temperature with a transition temperature (T1/2) close to 140 K. The spin crossover property of the complex is supported by a thermochromic reversible color change from red-brown at room temperature to dark brown on cooling in liquid nitrogen associated with the high-spin to low-spin transition.
Details
- Language :
- English
- ISSN :
- 14119420 and 24601578
- Volume :
- 23
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- Indonesian Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.0eae687b5bb4d388ec1b81178e7862f
- Document Type :
- article
- Full Text :
- https://doi.org/10.22146/ijc.81625