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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Influence of the metal size in the structure of the complexes derived from a pentadentate [N3O2] hydrazone
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Influence of the metal size in the structure of the complexes derived from a pentadentate [N3O2] hydrazone

机译：金属大小对源自五齿[N3O2] derived的配合物结构的影响

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The influence of the metal size in the nuclearity of the complexes derived from the hydrazone ligand 2,6- bis( 1- salicyloylhydrazonoethyl) pyridine [H(4)daps] has been investigated. We have synthesised a series of new complexes [ M(H(x)daps)] . yH(2)O, ( x = 2,3; y = 0 - 3) with M= Ag ( 1), Cd ( 2), Al ( 3), Sn ( 4) and Pb ( 6), using an electrochemical procedure. The crystal and molecular structures have been determined for the mononuclear complexes [Sn(H(2)daps)( H2O)(2)] . 4H(2)O ( 5) and [ Pb( H(2)daps)( CN)][ Et4N] ( 7). Complex 5 is the first neutral Sn( II) complex derived from a pentadentate hydrazone Schiff base ligand. Complex 7 shows the lead coordinated to the hydrazone donor set and a cyanide ligand, being the first reported complex with the lead atom coordinated to a monodentate cyanide group. Additionally, we have synthesised the lead complex using chemical conditions, in the presence of sodium cyanide which allowed us to isolate the neutral complex [ Pb( H(2)daps)] ( 8). Evaporation of these mother liquors led the novel compound [ Pb( Hdaphs)(CH3COO)] ( 9). Complex 9 shows the initial ligand hydrolysed in one of the imine bonds giving rise to a new tetradentate ligand [ H(2)daphs] coordinated to the lead atom and a bidentate acetate group. Moreover, the solution behaviour of the complexes has been investigated by H-1, Cd-113, Sn-117 and Pb-207 NMR techniques. In particular multinuclear NMR has provided new useful data to correlate factors such as oxidation state, coordination number and nature of the kernel donor atoms due to the new coordination found in complexes 5 and 7. The comparative study of the structures of the complexes derived from this pentadentate [ N3O2] hydrazone ligand let us to conclude that the metal size is a key factor to control the nuclearity of the complexes derived from the ligand [ H(4)daps].
机译：研究了金属大小对from配体2,6-双（1-水杨酰肼基乙基）吡啶[H（4）daps]衍生的配合物的核的影响。我们合成了一系列新的复合物[M（H（x）daps）]。 yH（2）O，（x = 2,3; y = 0-3），其中M = Ag（1），Cd（2），Al（3），Sn（4）和Pb（6）程序。晶体和分子结构已确定为单核络合物[Sn（H（2）daps）（H2O）（2）]。 4H（2）O（5）和[Pb（H（2）daps）（CN）] [Et4N]（7）。配合物5是衍生自五齿Sch席夫碱配体的第一个中性Sn（II）配合物。配合物7显示了与to供体组配位的铅和氰化物配体，这是首次报道的与铅原子配位为单齿氰化物基团的配合物。此外，我们在氰化钠存在下使用化学条件合成了铅配合物，这使我们能够分离出中性配合物[Pb（H（2）daps）]（8）。这些母液的蒸发导致了新化合物[Pb（Hdaphs）（CH3COO）]（9）。配合物9显示了在一个亚胺键中水解的初始配体，产生了一个新的四齿配体[H（2）daphs]，该配体与铅原子和乙酸双齿基团配位。此外，已通过H-1，Cd-113，Sn-117和Pb-207 NMR技术研究了配合物的溶液行为。特别是由于在配合物5和7中发现了新的配位，多核NMR已提供了新的有用数据来关联诸如氧化态，配位数和内核供体原子的性质等因素。由此衍生的配合物结构的比较研究五齿[N3O2] ligand配体让我们得出结论，金属的大小是控制衍生自配体[H（4）daps]的配合物核的关键因素。

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