Three new supramolecular networks formed via hydrogen bonding interactions: Syntheses, crystal structures and magnetic properties

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• 作者：Jian-Qiang Liu ; Yao-Yu Wang ; Lu-Fang Ma ; Wei-Hong Zhang ; Xi-Rui Zeng ; Fan Zhong ; Qi-Zhen Shi ; Shie-Ming Peng
• 关键词：Iron (III) ; Citrate ; Hydrogen bonds ; Supramolecular networks ; Magnetic behaviors
• 刊名：Inorganica Chimica Acta
• 出版年：2008
• 出版时间：1 January 2008
• 年：2008
• 卷：361
• 期：1
• 页码：173-182
• 全文大小：926 K

文摘

Three new iron(III) citrate complexes [Fe₂(cit)₂(H₂O)₂](H₂bpa) (1), [Fe₂(cit)₂(H₂O)₂](H₂bpe) (2) and [Fe₄(cit)₄(H₂O)₄](H₂bpp)₂(H₂O) (3) (cit = C(O⁻)(COO⁻)(CH₂COO⁻)₂, bpa = 1,3-bis(4-pyridyl)ethane, bpe = 1,3-bis(4-pyridyl)ethene, bpp = 1,3-bis(4-pyridyl)propane) were synthesized and characterized by elemental analysis, spectroscopic techniques and magnetic properties. Single X-ray diffraction analyses in the 1–3 complexes reveal that the iron ion is six-coordinated and is bound by two deprotonated citrates and a pair of aqua ligands in a distorted octahedral fashion. The anionic complex contains a centro-symmetrical planar of four-membered Fe₂O₂ ring. There are significant contributions to the stabilities of the assembled lattices in 1–3 arising from the protonated pyridine analogue counterions neutralizing the anionic charges of the complexes. The units in the complexes are connected together via hydrogen bonding to form 3D supramolecular networks. The supramolecular structures of 1–2 show alternating and motif linking the anionic moieties which are in turn interwoven with cationic moieties, while 3 shows alternating and motif. The magnetic properties of 1–3 are investigated and discussed in detail.