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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Self-ordering of metallogrid complexes via directed hydrogen-bonding
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Self-ordering of metallogrid complexes via directed hydrogen-bonding

机译：金属定向络合物通过定向氢键的自排序

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Reaction of imidazole aldehydes with dihydrazino derivatives of 2-phenylpyrimidine provides a family of bis(acylhydrazone)ligands which form[2 × 2]metallogrid complexes with transition metal ions including Fe(ii), Co(ii), Cu(ii)and Zn(ii). The free ligands show H-bonding interactions, both donor and acceptor, largely involving the imidazole units, while binding of the metal ions occupies all the acceptor sites and leaves only the pyrrolic-NH site as an H-bond donor, although its deprotonation by a strong base can regenerate an acceptor. These H-bonding interactions have been studied by 1H NMR spectroscopy in solution and in the solid state by means of several crystal structure determinations. The Fe(ii)grids appear to be exclusively high-spin species over a wide temperature range in solution. In the solid state various forms of spin-crossover behaviour can be observed between 1.8 and 300 K, which has been rationalised in terms of the varied forms of hydrogen-bonding possible in the crystalline state.
机译：咪唑醛与2-苯基嘧啶的二肼基衍生物的反应提供了双（酰基hydr）配体家族，其与包括Fe（ii），Co（ii），Cu（ii）和Zn在内的过渡金属离子形成[2×2]金属对位络合物（ii）。游离的配体在供体和受体上都表现出氢键相互作用，主要涉及咪唑单元，而金属离子的结合占据了所有的受体位点，只留下了吡咯-NH位点作为氢键供体，尽管它通过强大的基础可以再生受体。这些氢键的相互作用已通过1H NMR光谱在溶液中和固态下通过几种晶体结构测定方法进行了研究。 Fe（ii）格栅似乎是溶液中宽温度范围内的唯一高旋转物种。在固态下，可以观察到在1.8 K和300 K之间有各种形式的自旋交联行为，这在晶态下可能发生的氢键变化形式方面是合理的。

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