265114-82-7Relevant academic research and scientific papers
Heteronuclear chains of four metal atoms including one quadruply bonded dimetal unit. Dichromium and dimolybdenum compounds with appended copper(I) atoms
Cotton, F. Albert,Murillo, Carlos A.,Roy, Lindsay E.,Zhou, Hong-Cai
, p. 1743 - 1747 (2000)
It is shown that the M2(DPhIP)4 molecules (M = Cr, Mo; HDPhIP = 2,6-di(phenylimino)piperidine) can each capture two Cu(I) atoms to form molecules with linear Cu···M-M···Cu chains. In these chains the Cu(I) atoms have only weak interactions with the M atoms (Cr···Cu = 2.628 A; Mo···Cu = 2.615 A) even though their introduction causes marked decreases in the M-M distances (from 2.265 to 1.906 A for Cr and from 2.114 to 2.078 A, for Mo). These seemingly contradictory facts are explained by noting that in the M2(DPhIP)4 molecules there are strong destabilizing (to the M-M bonds) donor interactions of the dangling nitrogen atoms with the π* orbitals. When these are eliminated by the introduction of the Cu(I) atoms, the M-M bonds become stronger and shorter.
