Reaction of 2-Pyridylmethylthiourea Derivatives with [(en)2Co(OSO2CF3)2]+ Induces Hypodentate Coordination of an Ethylenediamine Ligand
作者:Lee Roecker、Alison Anderson、Aladdin Al-Haddad、Cawas Engineer、Joan Fetty、Charles Kiaza、Nicholas Noinaj、Nathan L. Coker、Jeanette Krause、Sean Parkin
DOI:10.1071/ch14029
日期:——
hypodentate ethylenediamine ligand. Four ligands were studied: N-(R)phenyl-N′-2-pyridylmethylthiourea (R = H (1a), CH3 (1b), OCH3 (1c)) and N-benzyl-N′-2-pyridylmethylthiourea (2). These bind through the sulfur, a deprotonated exo nitrogen, and the pyridyl nitrogen atoms forming four and five-membered rings, respectively. The ligand also coordinates in a bidentate manner through the sulfur and deprotonated
吡啶基甲基硫脲衍生物以三齿方式与[(en)2 Co(OSO 2 CF 3)2 ] +配位,导致形成亚齿乙二胺配体。四个配体进行了研究:N-(R)苯基Ñ '-2- pyridylmethylthiourea(R = H(1A),CH 3(图1b),OCH 3(1C))和N-苄基- ñ '-2- pyridylmethylthiourea(2)。这些通过硫(去质子化的exo)结合氮和吡啶氮原子分别形成四个和五个元环。配体还通过硫和去质子化的内或外氮原子以双齿方式配位,形成两个另外的配位异构体。Co-1b 2+的一个二齿异构体(内异构体)的固态结构(X射线)显示,配位的硫脲硫对反式Co-N键产生0.035Å的结构反式效应,而对硫脲的反式则为0.035Å。Co-1a 3+的三齿异构体证实了配体的配位模式和质子化的高齿次乙二胺配体的存在,如1 H和13 C NMR光谱。