Stoscup Julie A, Staples Richard J, Biros Shannon M
Department of Chemistry, Grand Valley State University, Allendale, MI 49401, USA.
Center for Crystallographic Research, Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA.
Acta Crystallogr Sect E Struct Rep Online. 2014 Sep 13;70(Pt 10):188-91. doi: 10.1107/S1600536814020078. eCollection 2014 Oct 1.
In the title compound poly[aqua-bis-(μ-nitrato-κ(4) O,O':O,O'')tetra-kis-(nitrato-κ(2) O,O'){μ4-tetra-ethyl [(ethane-1,2-diyl)bis(aza-nedi-yl)bis-(2-oxo-ethane-2,1-di-yl)]di-phospho-nate-κ(2) O,O'}disamarium(III)], [Sm2(NO3)6(C14H30N2O8P2)(H2O)] n , a 12-coordinate Sm(III) and a nine-coordinate Sm(III) cation are alternately linked via shared bis-bidentate nitrate anions into a corrugated chain extending parallel to the a axis. The nine-coordinate Sm(III) atom of this chain is also chelated by a bidentate, yet flexible, carbamoyl-methyl-phoshine oxide (CMPO) ligand and bears one water mol-ecule. This water mol-ecule is hydrogen bonded to nitrate groups bonded to the 12-coordinate Sm(III) 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 inter-actions.
在标题化合物聚[水合双（μ-硝酸根-κ(4) O,O':O,O''）四-双（硝酸根-κ(2) O,O'）{μ4-四乙基[（乙烷-1,2-二基）双（氮杂二基）双（2-氧代乙烷-2,1-二基）]二膦酸酯-κ(2) O,O'}二钐(III)]，[Sm2(NO3)6(C14H30N2O8P2)(H2O)]n 中，一个十二配位的Sm(III)和一个九配位的Sm(III)阳离子通过共享的双齿硝酸根阴离子交替连接成一条平行于a轴延伸的波纹链。该链中九配位的Sm(III)原子还被一个双齿但灵活的氨甲酰甲基氧化膦（CMPO）配体螯合，并带有一个水分子。这个水分子与键合到十二配位Sm(III)阳离子上的硝酸根基团形成氢键。位于对称中心的CMPO配体沿着c轴连接相邻的链，形成平行于ac平面的片层。这些片层中还存在酰胺NH基团与金属键合的硝酸根阴离子之间的氢键。这些片层仅通过范德华相互作用沿b轴堆积。
