首页> 外文期刊>Chemistry: A European journal >The Recently Synthesized Dimagnesiabutadiene and the Analogous Dimetalla-Beryllium, -Calcium, -Strontium, and -Barium Compounds
【24h】

The Recently Synthesized Dimagnesiabutadiene and the Analogous Dimetalla-Beryllium, -Calcium, -Strontium, and -Barium Compounds

机译:最近合成的二氧化镁丁二烯和类似的双金属铍,-钙,-锶和-钡化合物

获取原文
获取原文并翻译 | 示例
           

摘要

The 2014 synthesis of the remarkable dimagnesium compound Mg-2[C-4(CH3)(2)(Si(CH3)(3))(2)](C3H7)(2)(C4H8O)(2) may point the way to a new chapter in alkaline earth organometallic chemistry. Accordingly, we have studied the known Mg compound and the analogous Be, Ca, Sr, and Ba structures. Although most of our theoretical predictions come from density functional methods, the latter have been bench-marked using coupled cluster theory including single, double, and perturbative triplet excitations, CCSD(T) using cc-pVTZ basis sets. Among our most important predictions are the energies for dissociation to the butadiene plus the RM-MR [R=(C3H7)(2)(C4H8O)(2); M= Be, Mg, Ca, Si, and Ba] entities. The most reliable predictions for the dissociation energies are 99-104 (Be), 85-93 (Mg), 90-99 (Ca), 83-92 (Sr), and 83-94 (Ba) kcal mol(-1). Thus, there is reason to anticipate that the four unknown compounds should be achievable synthetically. The predicted metal-metal distances (not single bonds) are 2.89 angstrom (Mg center dot center dot center dot Mg), 3.46 angstrom (Ca center dot center dot center dot Ca), 3.75 angstrom (Sr center dot center dot center dot Sr), and 4.04 angstrom (Ba center dot center dot center dot Ba). The separated RM-MR compounds have longer M-M distances but genuine metal-metal single bonds. This perhaps counter intuitive result is due to the presence of the bridging carbons in the alkaline earth butadiene compounds. All five compounds incorporate metal-carbon ionic interactions.
机译:2014年合成出色的二镁化合物Mg-2 [C-4(CH3)(2)(Si(CH3)(3))(2)](C3H7)(2)(C4H8O)(2)可能会为我们指明方向碱土金属有机化学的新篇章。因此,我们研究了已知的Mg化合物及其类似的Be,Ca,Sr和Ba结构。尽管我们的大多数理论预测都来自密度泛函方法,但后者已使用耦合簇理论进行了基准测试,包括单重,双重和微扰三重态激发,使用cc-pVTZ基集的CCSD(T)。在我们最重要的预测中,有分解为丁二烯的能量加上RM-MR [R =(C3H7)(2)(C4H8O)(2; M = Be,Mg,Ca,Si和Ba]实体。离解能的最可靠预测是99-104(Be),85-93(Mg),90-99(Ca),83-92(Sr)和83-94(Ba)kcal mol(-1) 。因此,有理由预期这四种未知化合物应该可以合成获得。预测的金属-金属距离(非单键)为2.89埃(Mg中心点中心点中心点Mg),3.46埃(Ca中心点中心点中心点Ca),3.75埃(Sr中心点中心点中心点Sr)和4.04埃(Ba中心点中心点中心点Ba)。分离的RM-MR化合物具有更长的M-M距离,但具有真正的金属-金属单键。这种可能相反的直观结果是由于在碱土金属丁二烯化合物中存在桥连碳。所有这五个化合物都具有金属-碳离子相互作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号