Utility of 2-methoxyethanol in the synthesis of polyeuropium complexes: {l_brace}[Eu(OCH{sub 2}CH{sub 2}OMe){sub 2}(OC{sub 6}H{sub 3}R{sub 2}-2,6){sup {minus}}][H{sup +}]{r_brace}{sub 4} (R = Me, {sup i}Pr) and [EuAl{sub 2}(OCH{sub 2}CH{sub 2}OMe){sub 3}Me{sub 5}]{sub 2}
- Univ. of California, Irvine, CA (United States). Dept. of Chemistry
Europium reacts with 2-methoxyethanol at room temperature to form arene-soluble [Eu(OCH{sub 2}CH{sub 2}OMe){sub 2}]n. 1. Reaction of 1 with 2,6-dimethylphenol or 2,6-diisopropylphenol forms the tetrametallic complexes {l_brace}[Eu({mu}{sub 3}-{eta}{sup 2}-OCH{sub 2}CH{sub 2}OMe)({eta}{sup 2}-OCH{sub 2}CH{sub 2}OMe)(OC{sub 6}H{sub 3}R{sub 2}-2,6){sup {minus}}][H{sup +}]{r_brace}{sub 4} (R = Me, 2; R = {sup i}Pr, 3). Magnetic measurements of 1--3 in solution are consistent with the presence of divalent europium. 2 and 3 are isostructural and contain a tetrahedral arrangement of europium atoms. Coordinated to each seven-coordinate metal are one terminal bidentate alkoxide, one bridging bidentate alkoxide, which bridges through its alkoxide oxygen to two other europium atoms, a terminal aryloxide, and two bridging oxygen atoms from other such units. The presence of protons in 2 was probed by reaction with Al{sub 2}Me{sub 6}, which forms hexametallic [Me{sub 3}Al({mu}-{eta}{sup 2}-OCH{sub 2}CH{sub 2}OMe)Eu({mu}-{eta}{sup 2}-OCH{sub 2}-CH{sub 2}OMe){sub 2}AlMe{sub 2}]{sub 2}, 4. Each six-coordinate europium in 4 is surrounded by three bidentate 2-methoxyethoxide ligands, which bridge via their alkoxide oxygen atoms. One ligand bridges to one AlMe{sub 3} unit, and the other two ligands bridge to AlMe{sub 2} units.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 321108
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 20 Vol. 37; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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