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Proton-responsive naphthyridinone-based RuII complexes and their reactivity with water and alcohols.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-08-28 , DOI: 10.1039/d0dt02505d
Manuel Gallardo-Villagrán 1 , Orestes Rivada-Wheelaghan 1 , S M Wahidur Rahaman 1 , Robert R Fayzullin 2 , Julia R Khusnutdinova 1
Affiliation  

We report the synthesis and reactivity of RuII complexes with a new naphthyridinone-substituted phosphine ligand, 7-(diisopropylphosphinomethyl)-1,8-naphthyridin-2(1H)-one (L-H), which contains two reactive sites that can potentially be deprotonated by a strong base: an NH proton of naphthyridinone and a methylene arm attached to the phosphine. In the absence of a base, the stable bis-ligated complex Ru(L-H)2Cl2 (1) containing two NH groups in the secondary coordination sphere is formed. Upon further reaction with a base, a doubly deprotonated, dimeric complex is obtained, [Ru2(L*-H)2(L)2] (2), in which two of the four ligands undergo deprotonation at the NH (L), while the other two ligands are deprotonated at the methylene groups (L*-H) as confirmed by an X-ray diffraction study; intramolecular hydrogen bonding is present between the NH group of one ligand and an O-atom of another ligand in the dimeric structure, which stabilizes the observed geometry of the complex. Complex 2 reacts with protic solvents such as water or methanol generating aqua Ru(L)2(OH2)2 (3) or methanol complexes Ru(L)2(MeOH)2 (4), respectively, both exhibiting intramolecular H-bonded patterns with surrounding ligands at least in the solid state. These complexes react with benzyl alcohols to give aldehydes via base-free acceptorless dehydrogenation.

中文翻译:

质子响应萘啶酮基RuII复合物及其与水和醇的反应性。

我们报告了Ru II配合物与新的萘啶酮取代的膦配体7-(二异丙基膦甲基)-1,8-萘啶-2(1 H)-一个(LH)的合成和反应性,其中包含两个可能潜在的反应位点被强碱去质子化:萘啶酮的NH质子和连接在膦上的亚甲基臂。在不存在碱的情况下,形成了在二级配位球中包含两个NH基团的稳定的双连接的复合物Ru(LH2 Cl 21)。与碱进一步反应后,获得了双去质子化的二聚体复合物[Ru 2L * -H2L2 ](2),其中四个配体中的两个在NH(L)处去质子化,而另两个配体在亚甲基(L * -H)处质子化。研究; 二聚体结构中一个配体的NH基团和另一个配体的O原子之间存在分子内氢键,这使观察到的配合物几何形状稳定。配合物2与质子溶剂(例如水或甲醇)反应生成Ru(L2(OH 223)或甲醇配合物Ru(L2(MeOH)24)分别至少在固态下均表现出与周围配体的分子内H键模式。这些配合物与苄醇反应,通过无碱无受体脱氢反应生成醛。
更新日期:2020-09-22
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