Metal–Metal Distances at the Limit: Cr–Cr 1.73 Å – the Importance of the Ligand and its Fine Tuning
Tóm tắt
The synthesis and structure of a homobimetallic chromium complex is reported. The ligand used to stabilise the quintuply bonded metals is a sterically fine‐tuned guanidinate. A chromium–chromium bond length of 1.7293(12) Å was observed. It is the shortest metal–metal distance reported for a stable compound yet.
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Tài liệu tham khảo
Efremov Yu. M., 1974, Opt. Spectrosk., 36, 654
Ge S., 2008, Organometallics, 27, 313
$\rm P{\bar 1}$;a= 18.0850(17) b= 18.1010(17) c= 18.1180(2) Å; α = 75.711(8) ß= 76.094(8) γ= 89.885(5)°;R1= 0.0626 wR2(all data) = 0.1315.
Pccn;a= 13.4340(8) b= 19.7350(11) c= 19.8000(13) Å; α =β=γ= 90.00°;R1= 0.0490 [I> 2σ(I)] wR2(all data) = 0.0932.
Kahn O., 1996, Molecular Magnetism, 380
All structure optimisations were carried out at BP86/TZVP DFT level. NPA and ELF analyses were based on single point calculations at B3LYP/TZVPP level.
The employed model structure was based on X‐ray structure data of3 but the positions of all hydrogen atoms were optimised.