Ullery David R, Moore Curtis E, Thomas Christine M
100 W. 18<sup>th</sup> Ave., Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
Acta Crystallogr E Crystallogr Commun. 2021 Jul 27;77(Pt 9):871-874. doi: 10.1107/S205698902100743X. eCollection 2021 Sep 1.
The solid-state structure of di-μ-iodido-bis-{[(1,2,5,6-η)-cyclo-octa-1,4-diene]rhodium(I)}, [RhI(CH)] or [Rh(μ-I)(COD)], was determined from two crystals with different morphologies, which were found to correspond to two polymorphs containing Rh dimers with significantly different mol-ecular structures. Both polymorphs are monoclinic and the [Rh(μ-I)(COD)] mol-ecules in each case possess C symmetry. However, the core geometry of the butterfly-shaped RhI core differs substanti-ally. In the 2/ polymorph, the core geometry of [Rh(μ-I)(COD)] is bent, with a hinge angle of 96.13 (8)° and a Rh⋯Rh distance of 2.9612 (11) Å. The 2/ polymorph features a more planar [Rh(μ-I)(COD)] core geometry, with a hinge angle of 145.69 (9)° and a Rh⋯Rh distance of 3.7646 (5) Å.
二-μ-碘代-双-{[(1,2,5,6-η)-环辛-1,4-二烯]铑(I)}，即[RhI(CH)]或[Rh(μ-I)(COD)]的固态结构，是由两种具有不同形态的晶体确定的，发现它们对应于两种多晶型物，其中含有的铑二聚体具有显著不同的分子结构。两种多晶型物均为单斜晶系，且每种情况下的[Rh(μ-I)(COD)]分子都具有C对称性。然而，蝴蝶形RhI核的核心几何结构有很大差异。在2/多晶型物中，[Rh(μ-I)(COD)]的核心几何结构是弯曲的，铰链角为96.13 (8)°，Rh⋯Rh距离为2.9612 (11) Å。2/多晶型物的[Rh(μ-I)(COD)]核心几何结构更接近平面，铰链角为145.69 (9)°，Rh⋯Rh距离为3.7646 (5) Å。
