Iron(Ii) Complexes With Alinear Pentadentate Ligand H2l1 = Bis(N,N '-2-Methylimidazol-4-Yl-Methylideneaminopropyl) Methylamine And A Monodentate Ligand X (X = N-3(-), Ncs-, Ncse-)

Three iron(II) complexes with a linear symmetrical pentadentate ligand H2L1 and a monodentate ligand X (X = N-3(-), NCS-, NCSe-), [(FeN3)-N-II(H2L1)]BPh4 (1), [(FeNCS)-N-II(H2L1)]BPh4 (2), and [(FeNCSe)-N-II(H2L1)]BPh4 (3), were synthesized and characterized, where H2L1 denotes bis(N,N'-2-methylimidazol-4-yl-methylideneaminopropyl)methylamine. Compounds 1, 2 and 3 consist of a mononuclear complex-cation of [(FeX)-X-II(H2L1)](+) (X = N-3(-), NCS-, NCSe-) and a tetraphylborate (BPh4-) anion. Each complex-cation has an octahedral coordination geometry with N-6 donor atoms of a linear pentadentate ligand of H2L1 and a nitrogen atom of N-3(-), NCS-, or NCSe-, in which the linear pentadentate ligand is folded to coordinate to Fe-II ion in a cis-form. One of two imidazole groups of a complex-cation is hydrogen bonded to N-3(-), NCS-, or NCSe- of the adjacent complex-cation to form acyclic dimer structure for 1 and a zigzag-chain structure for 2 and 3. The temperature dependence of the magnetic data revealed that 1, 2 and 3 are high-spin (HS) complexes. (C) 2013 Elsevier B. V. All rights reserved.