Mixed-Valent Dicobalt and Iron–Cobalt Complexes with High-Spin Configurations and Short Metal–Metal Bonds
作者:Christopher M. Zall、Laura J. Clouston、Victor G. Young、Keying Ding、Hyun Jung Kim、Danylo Zherebetskyy、Yu-Sheng Chen、Eckhard Bill、Laura Gagliardi、Connie C. Lu
DOI:10.1021/ic400292g
日期:2013.8.19
Cobalt–cobalt and iron–cobalt bonds are investigated in coordination complexes with formally mixed-valent [M2]3+ cores. The trigonal dicobalt tris(diphenylformamidinate) compound, Co2(DPhF)3, which was previously reported by Cotton, Murillo, and co-workers (Inorg. Chim. Acta1996, 249, 9), is shown to have an energetically isolated, high-spin sextet ground-state by magnetic susceptibility and electron
在具有正式混合价[M 2 ] 3+核的配位化合物中研究了钴-钴和铁-钴键。三方羰基二钴三(diphenylformamidinate)化合物,钴2(DPhF)3,这是以前由棉,略,和合作者报道(Inorg化学学报1996年,249,9),被示为具有在能量分离磁化率和电子顺磁共振(EPR)光谱分析高自旋六重体的基态。介绍了一个新的三(酰胺基)胺配体平台。通过将三个a酰胺供体束缚到顶部胺上,该平台提供了两个不同的金属结合位点。使用苯基取代的变体(缩写为LPh),证明了二钴均双金属和铁钴异双金属的分离。新的[Co 2 ] 3+和[FeCo] 3+磁芯分别具有高旋转的六重态和septet基态。它们的固态结构显示出Co-Co的短金属-金属键距为2.29Å,Fe-Co的短金属-金属键距为2.18Å。后者是迄今为止铁钴结合的最短距离。为了指定铁和钴原子的位置以及确定是否发生Fe / Co混合,进行了X射