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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Tetraosmium carbonyl clusters containing mu-NH_2 amido ligands:syntheses,crystal structures and reactivities
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Tetraosmium carbonyl clusters containing mu-NH_2 amido ligands:syntheses,crystal structures and reactivities

机译:含mu-NH_2酰胺配体的四tra羰基簇:合成,晶体结构和反应性

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Treatment of [Os_4(mu-H)_4(CO)_(12)] with O-tert-butylhydroxylamine hydrochloride ('BuONH_2.HCl) afforded two amino ligand containing osmium clusters [Os_4(mu-H)_4(CO)_(11)(n~1-NH_2O'Bu)] (1) and [OS_4(mu-H)_4(CO)U{(U-H)_3OS(CO)_2(TI1-NH_2O'BU)_2C1}] (2) in moderate yields.For the same reaction,in the presence of one equivalent of [Os_3(CO),2],the novel heptaosmium carbonyl cluster [{Os_4(mu-H)_2(CO),(mu-NH_2)} {Os_3(mu-H)(CO)_(11)}] (3) was isolated together with 1 and 2.This heptaosmium cluster 3 displays an uncommon metal skeleton,where the tetraosmium tetrahedron and the triosmium triangle are connected by a metal-metal bond.Upon the addition of hydrobromic acid (HBr) to a solution of 1,a pair of geometric isomers,unsupported butterfly [Os_4(mu-H)_4(CO)_(11)(mu-NH_2)Br] (4a) and supported butterfly [Os_4(mu-H)_4(CO),(mu-NH_2)Br] (4b) clusters were formed.They are the first examples of mu-NH_2 amido tetraosmium carbonyl clusters,which serve as good models for the adsorbed nitrogen atoms on a stepped metal surface.Refluxing of 4a in toluene for several hours,afforded a new triosmium mu-NH_2 amido cluster [Os_3(u-H)_2-(CO)_9(mu-NH_2)Br] (5).Addition of an excess of triphenylcarbenium tetrafluoroborate [PH_3C][BF_4] to a solution of 4a in dichloromcthane gave another tetrahedral mu-NH_2 amido tetraosmium cluster [Os_4(mu-H)_2(CO)_(11)(mu-NH_2)Br] (6) in moderate yield upon elimination of two hydrides.
机译:用O-叔丁基羟胺盐酸盐('BuONH_2.HCl)处理[Os_4(mu-H)_4(CO)_(12)],得到两个含氨基配体的簇[Os_4(mu-H)_4(CO)_ (11)(n〜1-NH_2O'Bu)](1)和[OS_4(mu-H)_4(CO)U {(UH)_3OS(CO)_2(TI1-NH_2O'BU)_2C1}]] [2 )。对于相同的反应,在一当量[Os_3(CO),2]的存在下,新型七tao羰基簇[{Os_4(mu-H)_2(CO),(mu-NH_2)} {Os_3(mu-H)(CO)_(11)}](3)与1和2一起被隔离。该七tao簇3显示了一个不常见的金属骨架,其中四os四面体和the三角形通过金属连接-金属键。在将氢溴酸(HBr)添加至1,一对几何异构体,无载体的蝶形[Os_4(mu-H)_4(CO)_(11)(mu-NH_2)Br]的溶液中4a)并形成了支撑的蝴蝶[Os_4(mu-H)_4(CO),(mu-NH_2)Br](4b)团簇。它们是mu-NH_2酰胺基四os羰基团簇的第一个实例,可以作为很好的模型吸附氮在甲苯中回流4a数小时,得到了一个新的mu mu-NH_2酰胺簇[Os_3(uH)_2-(CO)_9(mu-NH_2)Br](5)。将过量的四氟硼酸三苯基碳鎓[PH_3C] [BF_4]添加到4a在二氯甲烷中的溶液中,得到另一个四面体的mu-NH_2酰胺基四os簇[Os_4(mu-H)_2(CO)_(11)(mu-NH_2)Br](6 )消除两个氢化物后产率中等。

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