1/8/2024 0 Comments Axial font boxManipulating Magnetism: Ru25+ Paddlewheels Devoid of Axial Interactions. Murillo, Karen Ventura, Dino Villagrán, and Xiaoping Wang. Pushing the Limits of Delta Bonding in Metal–Chromium Complexes with Redox Changes and Metal Swapping. Tolman, Eckhard Bill, Laura Gagliardi, and Connie C. The Journal of Physical Chemistry A 2019, 123 Trends in the Bond Multiplicity of Cr2, Cr3, and Cr2M (M = Zn, Ni, Fe, Mn) Complexes Extracted from Multiconfigurational Wave Functions. ![]() ![]() Mariano Spivak, Xavier López, Coen de Graaf.Trans Influence across a Metal–Metal Bond of a Paddle-Wheel Unit on Interaction with Gases in a Metal–Organic Framework. Paramagnetic Metal–Metal Bonded Heterometallic Complexes. Synthesis and Characterization of a Linear Triiron(II) Extended Metal Atom Chain Complex with Fe–Fe Bonds. Bifunctional Effect of a Triple-Bond Heterobimetallic Zr/Co System for Hydrogen Activation. Yinwu Li, Peifeng Su, Jingxing Jiang, Zhuofeng Ke.This article is cited by 61 publications. The Cr 2(dpa) 4 molecule occurs in three different crystalline compounds, in all of which there are slightly different conformations, but the same Cr−Cr distance, 1.94 ± 0.01 Å these may be compared to that in the compound Cr 2(mpa) 4 (1.87 Å) in which the bridging is quite similar but there are no tethered additional donor atoms. Thus, the cumulative effect of donation from four nitrogen atoms is very large, namely, 0.4 Å in the Cr−Cr distance. In this case the ligand is very similar to DPhIP except that it has no donor nitrogen atoms available for axial π* donation. For direct comparison, the compound Cr 2(PhIP) 4 (PhIP is the anion of 2-(phenylimino)piperidine) was made and found to have a Cr−Cr distance of 1.858(1) Å. ![]() In the compound Cr 2(DPhIP) 4 four imino nitrogen lone pairs are suitably positioned to donate to the π* orbitals and the Cr−Cr bond length is 2.265(1) Å. The ligands used for this purpose are the anions of 2,6-di(phenylimino)piperidine (DPhIP) and 2,2‘-dipyridylamine (dpa). A molecule has been designed to ensure that there is axial donation into the π* orbitals but not onto the σ* orbital ligands have been used in which the donor atoms are tethered to the bridging ligands in such a way that they can reach only the π* orbitals but not the σ* orbital. Some molecules have now been made that allow a definitive assessment of this axial π* effect. It is well-known that donation of electron density into the σ* orbital of a Cr−Cr quadruple bond causes major lengthening of the Cr−Cr distance, and there is some prior evidence that a similar lengthening is caused by dative interaction with the π* orbitals.
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