화학공학소재연구정보센터
Inorganic Chemistry, Vol.55, No.1, 214-220, 2016
Inter- versus Intramolecular Structural Manipulation of a Dichromium(II) Pacman Complex through Pressure Variation
The effect of pressure on the intranuclear M center dot center dot center dot M separation and intermolecular secondary interactions in the dinudear chromium Pacman complex [Cr-2(L)](C6H6) was evaluated because this compound contains both a short Cr center dot center dot center dot Cr separation and an exogenously bound molecule of benzene in the solid state. The electronic structure of [Cr-2(L)] was determined by electron paramagnetic resonance spectroscopy, SQUID magnetometry, and density functional theory calculations and shows a diamagnetic ground state through antiferromagnetic exchange, with no evidence for a Cr Cr bond. Analysis of the solid-state structures of [Cr-2(L)](C6H6) at pressures varying from ambient to 3.0 GPa shows little deformation in the Cr center dot center dot center dot Cr separation, i.e., no Cr-Cr bond formation, but instead a significantly increased interaction between the exogenous arene and the chromium iminopyrrolide environment. It is therefore apparent from this analysis that [Cr-2(L)] would be best exploited as a rigid chemical synthon, with pressure regulation being used to mediate the approach and secondary interactions of possible substrates.