crystal structure, carbamoylmethyl- phosphine oxide (CMPO), rare earth element, metal–organic polymer




In the title compound poly[aqua­bis­(-nitrato-4O,O':O,O'')tetra­kis­(nitrato-2O,O'){4-tetra­ethyl [(ethane-1,2-diyl)bis(aza­nedi­yl)bis­(2-oxo­ethane-2,1-di­yl)]di­phospho­nate-2O,O'}disamarium(III)], [Sm2(NO3)6(C14H30N2O8P2)(H2O)]n, a 12-coordinate SmIII and a nine-coordinate SmIII cation are alternately linked via shared bis-bidentate nitrate anions into a corrugated chain extending parallel to the a axis. The nine-coordinate SmIII atom of this chain is also chelated by a bidentate, yet flexible, carbamoyl­methyl­phoshine oxide (CMPO) ligand and bears one water mol­ecule. This water mol­ecule is hydrogen bonded to nitrate groups bonded to the 12-coordinate SmIII cation. The CMPO ligand, which lies about an inversion center, links neighboring chains along the c axis, forming sheets parallel to the ac plane. Hydrogen bonds between the amide NH group and metal-bound nitrate anions are also present in these sheets. The sheets are packed along the b axis through only van der Waals inter­actions.


Original Citation:

Stoscup, J. A., Staples, R. J., & Biros, S. M. (2014). Crystal structure of a samarium(III) nitrate chain cross-linked by a bis-carbamoylmethylphosphine oxide ligand. Acta Crystallographica Section E Structure Reports Online, 70(10), 188–191.

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