Preparation and X-ray structures of K[Ln(O-2,6-i-Pr{sub 2}C{sub 6}H{sub 3}){sub 4}] (Ln = La, Nd, Er). Extended chain structures of lanthanide tetrakis(aryloxide) anions bridged by potassium-{eta}-arene interactions
- Los Alamos National Lab., NM (United States); and others
Reaction of several lanthanide trichlorides LnCl{sub 3} (Ln = La, Nd, Er, Lu) with 3 or 4 equiv of potassium 2,6-diisopropylphenoxide in THF solution leads to the formation of potassium salts of formula K[Ln(O-2,6-i-Pr{sub 2}C{sub 6}H{sub 3}){sub 4}][Ln = Nd (5), Er (6), Lu (7), La (8)]. These salts exhibit unusual solid-state structures involving multihapto potassium-{pi}-arene interactions. Not all lanthanide trichlorides produce the potassium salt directly from this reaction, and the nature of the product appears to be related to the solubility of the LnCl{sub 3} starting material in THF solution. Compounds 5 and 6 exist in the solid state as pseudo-one-dimensional infinite-chain structures featuring multihapto K-C interactions with phenyl rings from two adjacent [Ln(OAr){sub 4}]{sup {minus}} units. Compound 8 forms a pseudo-two-dimensional sheet structure, with multihapto K-C interactions linking three neighboring [Ln(OAr){sub 4}]{sup {minus}} units. Ln-O distances within the tetrahedral [Ln(OAr){sub 4}]{sup {minus}} units average 2.211(12) (5), 2.084(14) (6) and 2.253-(6) {angstrom} (8).
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 421019
- Journal Information:
- Inorganic Chemistry, Vol. 33, Issue 25; Other Information: PBD: 7 Dec 1994
- Country of Publication:
- United States
- Language:
- English
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