Redox-noninnocence of N,N′-bis(6-methyl-2-pyridylmethylene)ethane-1,2-diamine (L): synthesis and characterization of diamagnetic [NiII2(L˙˙)2] and [ZnII2(L)Cl4]((L˙˙)2−π diradical dianion of L)
The synthesis of two diamagnetic dinuclear complexes [NiII2(LËË)2] (1) and [ZnII2(L)Cl4] (2) and an octahedral, paramagnetic, mononuclear complex [FeII(L)Cl2] (3) (S = 2) is reported; the tetradentate ligand N,Nâ²-bis(6-methyl-2-pyridylmethylene)ethane-1,2-diamine, L, is shown to be redox noninnocent. It exists in its neutral closed-shell form L in 2 and 3 and in its dianionic diradical form, (LËË)2â, in 1.
报道了两种抗磁性二核配合物[NiII2(L)2] (1)和[ZnII2(L)Cl4] (2)以及八面体顺磁性单核配合物[FeII(L)Cl2] (3) (S = 2)的合成;四齿配体N,N-双(6-甲基-2-吡啶亚甲基)乙烷-1,2-二胺L被证明是非氧化还原性的。它在2和3中以中性闭壳形式L存在,在1中以二阴离子二自由基形式(L)2⁻存在。
Van Stein, Gerard C.; Van Koten, Gerard; Vrieze, Kees, Inorganic Chemistry, 1984, vol. 23, # 25, p. 4269 - 4278
作者:Van Stein, Gerard C.、Van Koten, Gerard、Vrieze, Kees、Brevard, Christian
DOI:——
日期:——
Asymmetric Transformation of a Double-Stranded, Dicopper(I) Helicate Containing Achiral Bis(bidentate) Schiff Bases
作者:Nicolle C. Habermehl、Patricia M. Angus、Nathan L. Kilah、Lasse Norén、A. David Rae、Anthony C. Willis、S. Bruce Wild
DOI:10.1021/ic051478c
日期:2006.2.1
the enantiomericallypure Delta-(-)-tris(catecholato)arsenate(V) ([As(cat)3]-) in the presence of Dabco gave the two diastereomers (R,R)-[Cu2L2][Delta-(-)-[As(cat)3]]2 and (S,S)-[Cu2L2][Delta-(-)-[As(cat)3]]2 in up to 54% diastereomeric excess, as determined by (1)H NMR spectroscopy. The diastereomerically and enantiomericallypure salt (R,R)-[Cu(2)L2][Delta-(-)-[As(cat)3]]2 crystallized from the solution
双(双齿)席夫碱N,N'-双(6-烷基-2-吡啶基亚甲基)乙烷-1,2-二胺(其中烷基= H,Me,iPr)(L)与四(乙腈)的反应六氟磷酸铜(I)和六氟磷酸银(I)分别提供双链双核金属螺旋结构[T-4-(R,R)]-(+/-)-[M2L2](PF6)2(M = Cu,Ag)。通过1H和13C NMR光谱,电导率,微分析和对所选化合物的单晶X射线结构测定来表征螺旋结构。通过1 H NMR光谱研究了配合物的分子间配体交换和分子内转化率。两个不同取代的螺旋结构之间的可逆分子间配体交换遵循一级动力学。双铜(I)螺旋的配体交换的速率常数(k)和相应的半衰期(t(1/2))为k =(1.6-1.8)x 10(-6)s(-1)(t (1/2)= 110-120 h)在丙酮-d6中,k = 4.9 x 10(-6)s(-1)(t(1/2)= 40 h)在二氯甲烷-d2中,并且k> 2 x 10(-3)s