Crystal structure of strontium Di[bis(iminodiacetato)cobaltate(III)] pentahydrate, Sr[cis(N)-Co(Ida){sub 2}]{sub 2} {center_dot} 5H{sub 2}O
- National Academy of Sciences of Belarus, Stepanov Institute of Physics (Belarus)
- Russian Academy of Sciences, Kurnakov Institute of General and Inorganic Chemistry (Russian Federation)
Compound Sr[cis(N)-Co(Ida){sub 2}]{sub 2} {center_dot} 5H{sub 2}O (I) is synthesized and its crystal structure is determined. The crystals are built of [Co(Ida){sub 2}]{sup -} anionic complexes, [Sr(H{sub 2}O){sub 3}]{sup 2+} hydrated cations, and crystallization water molecules. Two independent anions are located on rotation axis 2 and have close structures. A distorted octahedral coordination of Co{sup 3+} atoms is formed by two N atoms and four O atoms of two Ida{sup 2-} ligands [Co-N, 1.932(3) and 1.940(3) Angstrom-Sign ; Co-O, 1.879-1.899(3) Angstrom-Sign ]. [Sr(H{sub 2}O){sub 3}]{sup 2+} cations randomly occupy half of the positions in the vicinity of centers of inversion. In addition to three water molecules, the environment of the Sr{sup 2+} atom includes five O atoms of five Ida{sup 2-} ligands [Sr-O, 2.487(3)-2.889(5) Angstrom-Sign ]. Because of the disordering of [Sr(H{sub 2}O){sub 3}]{sup 2+} cations, the structural function of the Ida{sup 2-} ligands varies from tridentate chelate to pentadentate bridging chelate. Sr-O and hydrogen bonds connect structural elements into a three-dimensional framework. The structure of I is compared with that of a related compound Sr[CoEdta]{sub 2}{center_dot}9H{sub 2}O (II). It is shown that the formation of N-H Horizontal-Ellipsis O hydrogen bonds, which connect [Co(Ida){sub 2}]{sup -} anionic complexes in I into compact chains, is an important factor leading to the difference between packings I and II.
- OSTI ID:
- 22054185
- Journal Information:
- Crystallography Reports, Vol. 57, Issue 2; Other Information: Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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