Structural investigation into the steric control of polyether complexation in the lanthanide series: Macrocyclic 18-crown-6 versus acyclic pentaethylene glycol
Abstract
The complexation reactions of MCl[sub 3][center dot]nH[sub 2]O (M = Y, La-Pr, Sm-Lu) with pentaethylene glycol (EO5) and MCl[sub 3][center dot]nH[sub 2]O (M = La, Ce, Pr, Eu, Gd) with 18-crown-6 in 1:1 molar ratios in 3:1 CH[sub 3]CN:CH[sub 3]OH were investigated. X-ray structural analysis of 21 crystalline complexes were carried out. Comparison of all the crystalline complexes studied reveals that polyethylene glycols exhibit a helical wrapping pattern around the lanthanide ions, while the crown ethers attempt to fold around these cations. This feature of polyether complexation of the lanthanide(III) chlorides may be responsible for the ready isolation of EO5 complexes for all lanthanides and the lack of direct coordination of 18-crown-6 past M = Tb in normal 1:1 complexation reactions.
- Authors:
-
- Northern Illinois Univ., DeKalb, IL (United States)
- Publication Date:
- OSTI Identifier:
- 5088593
- Resource Type:
- Journal Article
- Journal Name:
- Inorganic Chemistry; (United States)
- Additional Journal Information:
- Journal Volume: 32:16; Journal ID: ISSN 0020-1669
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; RARE EARTH COMPLEXES; CRYSTAL STRUCTURE; YTTRIUM COMPLEXES; CHELATING AGENTS; CROWN ETHERS; HYDRATES; POLYETHYLENE GLYCOLS; X-RAY DIFFRACTION; ALCOHOLS; COHERENT SCATTERING; COMPLEXES; DIFFRACTION; ETHERS; GLYCOLS; HYDROXY COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; ORGANIC POLYMERS; POLYMERS; SCATTERING; TRANSITION ELEMENT COMPLEXES; 400201* - Chemical & Physicochemical Properties
Citation Formats
Rogers, R D, Rollins, A N, Etzenhouser, R D, Voss, E J, and Bauer, C B. Structural investigation into the steric control of polyether complexation in the lanthanide series: Macrocyclic 18-crown-6 versus acyclic pentaethylene glycol. United States: N. p., 1993.
Web. doi:10.1021/ic00068a013.
Rogers, R D, Rollins, A N, Etzenhouser, R D, Voss, E J, & Bauer, C B. Structural investigation into the steric control of polyether complexation in the lanthanide series: Macrocyclic 18-crown-6 versus acyclic pentaethylene glycol. United States. https://doi.org/10.1021/ic00068a013
Rogers, R D, Rollins, A N, Etzenhouser, R D, Voss, E J, and Bauer, C B. 1993.
"Structural investigation into the steric control of polyether complexation in the lanthanide series: Macrocyclic 18-crown-6 versus acyclic pentaethylene glycol". United States. https://doi.org/10.1021/ic00068a013.
@article{osti_5088593,
title = {Structural investigation into the steric control of polyether complexation in the lanthanide series: Macrocyclic 18-crown-6 versus acyclic pentaethylene glycol},
author = {Rogers, R D and Rollins, A N and Etzenhouser, R D and Voss, E J and Bauer, C B},
abstractNote = {The complexation reactions of MCl[sub 3][center dot]nH[sub 2]O (M = Y, La-Pr, Sm-Lu) with pentaethylene glycol (EO5) and MCl[sub 3][center dot]nH[sub 2]O (M = La, Ce, Pr, Eu, Gd) with 18-crown-6 in 1:1 molar ratios in 3:1 CH[sub 3]CN:CH[sub 3]OH were investigated. X-ray structural analysis of 21 crystalline complexes were carried out. Comparison of all the crystalline complexes studied reveals that polyethylene glycols exhibit a helical wrapping pattern around the lanthanide ions, while the crown ethers attempt to fold around these cations. This feature of polyether complexation of the lanthanide(III) chlorides may be responsible for the ready isolation of EO5 complexes for all lanthanides and the lack of direct coordination of 18-crown-6 past M = Tb in normal 1:1 complexation reactions.},
doi = {10.1021/ic00068a013},
url = {https://www.osti.gov/biblio/5088593},
journal = {Inorganic Chemistry; (United States)},
issn = {0020-1669},
number = ,
volume = 32:16,
place = {United States},
year = {Wed Aug 04 00:00:00 EDT 1993},
month = {Wed Aug 04 00:00:00 EDT 1993}
}