The effect of molecular packing on the occurrence of spin crossover phenomena in one-dimensional Fe(II)-bis-Schiff base complexes |
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Authors: | Atsuhiro Nabei Takayoshi Kuroda-Sowa Takashi Okubo Masahiko Maekawa Megumu Munakata |
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Affiliation: | Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka, Japan;Universita degli Studi di Firenze, Dipartimento di Chimica, Polo Scientifico, Via della Lastruccia 3, 50019 Sesto Fiorentino (Firenze), Italy |
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Abstract: | Two new one-dimensional Fe(II)-bis-Schiff base complexes, [Fe(L1)(pyz)] · CH2Cl2 (1) and [Fe(L2)(pyz)] · 2CH2Cl2 (2) (H2L1 = bis(O-vanillin)-O-phenylenediimine, H2L2 = bis(O-vanillin)-2,3-naphthalenediimine, pyz = pyrazine) are reported with their crystal structures and magnetic property. Compound 1 shows a two-step SCO behavior while 2 shows HS at all the temperature range measured. Although the extension of aromatic moiety from benzene (L1) to naphthalene (L2) was introduced for the purpose of strengthening the cooperativity, it leads to the absence of SCO, due to the unanticipated π–π interaction, which leads to the longer Fe–N bond lengths and a weak ligand field around Fe(II) ion. |
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