Synthesis and solution behaviour of stable mono-, di- and trinuclear Pd(II) complexes of 2,5-pyridinedihydroxamic acid: X-ray crystal structure of a novel Pd(II) hydroxamato complex
作者:Darren M. Griffith、Linda Bíró、James A. Platts、Helge Müller-Bunz、Etelka Farkas、Péter Buglyó
DOI:10.1016/j.ica.2011.09.050
日期:2012.1
coordination modes are (N-py,N), (O,O')(2) and (O,O')(5) where (N-py,N') is through a pyridine N and deprotonated hydroximate N and (O,O') is via doubly deprotonated hydroximate groups at positions 2 and 5 on the pyridine ring. Stability constants for the mono-, di- and trinuclear [Pd(en)](2+) complexes of 2,5-pyridinedihydroxamic acid are also reported. In solution at equimolar concentrations, 2,5-pyha effectively
报道了2,5-吡啶二异羟肟酸(2,5-pyha)的单,二和三核Pd(II)配合物。确定了[Pd(en)(2,5-pyha-(1H))] Cl(en =乙二胺)的单核络合物的X射线晶体结构,其(N-py,N)结合模式为2 ,5-pyha,其中(N-py,N)通过吡啶N和去质子化的异羟肟酸酯N。这种配位模式以前从未在Pd(II)异羟肟酸酯络合物中观察到。描述了异羟肟酸的二核和三核Pd(II)配合物的第一个实例,其中一个2,5-pyha配体分别充当两个和三个Pd(en)部分的桥。在Turbomole包装中,通过密度泛函理论在RI-BP86 / def2-TZVP水平上研究了拟议的双核络合物的2,5-pyha潜在结合模式的稳定性。发现(N-py,N),(O,O' )(2)得到更稳定的络合物,其中(N-py,N')通过吡啶N和去质子化的氢氧根N,(O,O')(2)通过羰基氧原子和去质子化的羟基吡啶环