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Synthesis, crystal structure and magnetic properties of the spin crossover system [Fe(pq)3]2+
Jahro I.S.a, Onggo D.a, Ismunandara, Rahayu S.I.a, Munoz M.C.b, Gaspar A.B.c, Seredyuk M.d, Gutlich P.d, Real J.A.c
a Inorganic and Physical Chemistry Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia
b Departament de Física Aplicada, Universitat Politécnica de València, Spain
c Institut de Ciencia Molecular, Universitat de València, Spain
d Institut für Anorganische und Analytsische Chemie, Johannes-Gutenberg-Universität, Germany
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Three new compounds formulated (ClO4)2[Fe(pq)3] (1), (BF4)2[Fe(pq)3] · EtOH (2) and {(ClO4)[MnCr(C2O4)3][Fe(pq)2(H2O)2]} (3), where pq is 2,2′-pyridylquinoline, have been synthesised and characterised. Despite the different crystal packing exhibited by 1 and 2, the cationic species [Fe(pq)3]2+ are structurally quite similar. At 293 K, the Fe-N bond lengths are characteristic of the iron(II) in the high-spin state. In contrast to 1, 2 undergoes a continuous spin transition. Indeed, at 95 K its structure experiences a noticeable change in the Fe-N bonds and angles, i.e. the Fe-N bonds shorten by 0.194 Å on the average. The magnetic behaviour confirms that 1 is fully high-spin in the 4-300 K temperature range while 2 shows a spin transition centred at T1/2 = 150 K. The corresponding enthalpy, entropy and interaction parameter are ΔH = 7.49 kJ mol-1, ΔS = 50 J K-1 mol-1and Γ = 1.35 kJ mol-1. Compound 3 has been obtained as a microcrystalline powder. The magnetic properties of 3 point at the occurrence of ferromagnetic coupling below 100 K and the onset of a ferromagnetic ordering below 10 K (Weiss constant equal to 6.8 K). The Mössbauer spectra of 3 show the occurrence of a magnetic order at T ≤ 4.2 K. © 2008 Elsevier B.V. All rights reserved.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Coordination Polymers,Ferromagnetic coupling,Ferromagnetic orderings,Interaction parameters,Iron complex,Microcrystalline powders,Mossbauer spectra,Spin crossovers[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Coordination polymers,Crystal structure,Iron(II) complexes,Magnetism,Mossbauer Spectra,Spin crossover[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]Financial support is acknowledged from the Spanish DGICYT (CTQ2007-64727/BQU), from the European Network of excellence MAGMANET, and the Deutsche Forschungsgemeinschaft (Priority Program 1137). A.B.G. thanks the Spanish MEC for a research contract (Programa Ramón y Cajal). Appreciation is expressed to Mrs. M. Aminah, ITB for preparation of pq. Appendix A[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1016/j.ica.2008.03.122[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]