Locating Interstitial Hydrides in MH(2)@Cu(14) (M = Cu, Ag) Clusters by Single-Crystal X-ray Diffraction

[Image: see text] Two structures, [Cu(15)H(2)(S(2)CN(n)Bu(2))(6)(C≡CPh)(6)][CuCl(2)] (1) and [AgH(2)Cu(14){S(2)P(O(i)Pr)(2)}(6)(C≡CPh)(6)][PF(6)] (2), are characterized by X-ray crystallography with high-quality single crystals. The position of interstitial hydrides can be accurately located. In addition, the refinement of the hydrides with anisotropic displacement parameters (ADPs) was successful. The distances between the central atom and copper atoms, as well as the distances within the metal cages surrounding the hydrides, are analyzed and compared with similar MH(2)@Cu(14) (M = Cu, Ag, Pd) compounds. This work provides a thoughtful and accurate assessment of the considerations and challenges associated with anisotropic refinement for H atoms, particularly in X-ray data collection.