Correlation of MLCTs of Group 7
<i>fac</i>
‐[M(CO)
<sub>3</sub>
]
<sup>+</sup>
Complexes (M = Mn, Re) with Bipyridine, Pyridinylpyrazine, Azopyridine, and Pyridin‐2‐ylmethanimine Type Ligands for Rational photoCORM Design
A mathematical correlation of the MLCT absorption maxima of structurally related fac‐[M(CO)3L2Br] complexes (M = Mn, Re; L2 = bidentate ligand) is obtained by the comparison of a total of 50 species bearing bipyridine, pyridinylpyrazine, azopyridine and pyridin‐2‐ylmethanimine L2 type ligands. The empirical relationship is first derived by the initial comparison of the MLCT absorption maxima of 26
通过比较总共50个带有联吡啶的物种,获得了结构相关的fac- [M(CO)3 L 2 Br]配合物(M = Mn,Re; L 2 =双齿配体)的MLCT吸收最大值的数学相关性,吡啶基吡嗪,偶氮吡啶和吡啶-2-基甲胺L 2类型配体。经验关系首先通过对先前发布的26种复合物的MLCT吸收最大值进行初步比较得出,然后用于预测其他24种物种的相同吸收值。为了检查预测的有效性,准备了几种新的配合物。对它们进行了光谱表征,并在可能的情况下阐明了其X射线固态结构。初始的数学相关性可以预测未知物种的MLCT吸收最大值,平均差异为12 nm。随后利用以下导出的公式Calc Mn m LCT =(Obs Re MLCT /0.88)– 15.1将关系精炼为平均误差为6 nm。计算Mn m LCT = Mn配合物MLCT和Obs Re的预测值MLCT =实验观察到的Re配合物的MLCT转变。从长远来看,相关性和
Tuning coordination modes of pyridine/thioether Schiff base (NNS) ligands to mononuclear manganese carbonyls
作者:Simone E. A. Lumsden、Gummadi Durgaprasad、Keren A. Thomas Muthiah、Michael J. Rose
DOI:10.1039/c4dt00600c
日期:——
represented by [(NMeNS)Mn(CO)2Br] ↔ [(NMeNS)Mn(CO)2Br]. Lastly, we obtained crystal structures of the S-bound and S-unbound conformers derived from the same ligand – the fluorophenyl derived FPhNNS, namely [(FPhNNS)Mn(CO)3Br] (5CO-a) and [(FPhNNS)Mn(CO)2Br] (5CO-b). This report represents several examples of a thioether-stabilized Mn(CO)2}+ fragment, a deviation from the usual ‘piano stool’ Mn(I) tricarbonyl
我们研究了NNS Schiff碱,硫醚配体对锰(I)羰基的配位方式。配体在席夫碱键处包含邻位取代的吡啶(H,CH 3,OCH 3,氟苯基)和各种取代基(H,CH 3)。通常,[Mn(CO)5 Br]与三齿NNS配体在CH 2 Cl 2中的反应提供了这样的物质,其中硫醚-S可以结合或不结合到锰中心,具体取决于分子中的空间和电子取代。配体框架;结果,该配合物分别显示出两个或三个羰基配体。醛衍生的配体骨架(R1 NH NS)通常提供[[ R NN S)Mn(CO) 3 Br]( 1 CO, 2 CO, 3 CO; R = H,OCH 3,CH 3)类型的络合物,其螯合物(S (不受约束)在X射线结构中。相反,使用亚氨基甲基配体(N Me NS)可得到式[( N Me NS)Mn(CO) 2 Br]( 4 CO)的配合物,其中混合的N /硫醚-S稳定了Mn( CO) 2 } +片段。在固态红外光谱中,[[R