# The Lanthanide Contraction Revisited

## Abstract

A complete, isostructural series of lanthanide complexes (except Pm) with the ligand TREN-1,2-HOIQO has been synthesized and structurally characterized by means of single-crystal X-ray analysis. All complexes are 1D-polymeric species in the solid state, with the lanthanide being in an eight-coordinate, distorted trigonal-dodecahedral environment with a donor set of eight unique oxygen atoms. This series constitutes the first complete set of isostructural lanthanide complexes with a ligand of denticity greater than two. The geometric arrangement of the chelating moieties slightly deviates across the lanthanide series, as analyzed by a shape parameter metric based on the comparison of the dihedral angles along all edges of the coordination polyhedron. The apparent lanthanide contraction in the individual Ln-O bond lengths deviates considerably from the expected quadratic decrease that was found previously in a number of complexes with ligands of low denticity. The sum of all bond lengths around the trivalent metal cation, however, is more regular, showing an almost ideal quadratic behavior across the entire series. The quadratic nature of the lanthanide contraction is derived theoretically from Slater's model for the calculation of ionic radii. In addition, the sum of all distances along the edges of the coordination polyhedron show exactly the samemore »

- Authors:

- Publication Date:

- Research Org.:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)

- Sponsoring Org.:
- USDOE Director. Office of Science. Basic EnergySciences

- OSTI Identifier:
- 923295

- Report Number(s):
- LBNL-62640

Journal ID: ISSN 0002-7863; JACSAT; R&D Project: 403015; BnR: KC0302030; TRN: US200804%%1046

- DOE Contract Number:
- DE-AC02-05CH11231

- Resource Type:
- Journal Article

- Journal Name:
- Journal of the American Chemical Society

- Additional Journal Information:
- Journal Volume: 129; Journal Issue: 36; Related Information: Journal Publication Date: 09/12/2007; Journal ID: ISSN 0002-7863

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 37; ATOMS; BOND LENGTHS; CONTRACTION; FORECASTING; METRICS; OXYGEN; RARE EARTHS; SHAPE

### Citation Formats

```
Seitz, Michael, Oliver, Allen G, and Raymond, Kenneth N.
```*The Lanthanide Contraction Revisited*. United States: N. p., 2007.
Web. doi:10.1021/ja072750f.

```
Seitz, Michael, Oliver, Allen G, & Raymond, Kenneth N.
```*The Lanthanide Contraction Revisited*. United States. doi:10.1021/ja072750f.

```
Seitz, Michael, Oliver, Allen G, and Raymond, Kenneth N. Thu .
"The Lanthanide Contraction Revisited". United States. doi:10.1021/ja072750f. https://www.osti.gov/servlets/purl/923295.
```

```
@article{osti_923295,
```

title = {The Lanthanide Contraction Revisited},

author = {Seitz, Michael and Oliver, Allen G and Raymond, Kenneth N},

abstractNote = {A complete, isostructural series of lanthanide complexes (except Pm) with the ligand TREN-1,2-HOIQO has been synthesized and structurally characterized by means of single-crystal X-ray analysis. All complexes are 1D-polymeric species in the solid state, with the lanthanide being in an eight-coordinate, distorted trigonal-dodecahedral environment with a donor set of eight unique oxygen atoms. This series constitutes the first complete set of isostructural lanthanide complexes with a ligand of denticity greater than two. The geometric arrangement of the chelating moieties slightly deviates across the lanthanide series, as analyzed by a shape parameter metric based on the comparison of the dihedral angles along all edges of the coordination polyhedron. The apparent lanthanide contraction in the individual Ln-O bond lengths deviates considerably from the expected quadratic decrease that was found previously in a number of complexes with ligands of low denticity. The sum of all bond lengths around the trivalent metal cation, however, is more regular, showing an almost ideal quadratic behavior across the entire series. The quadratic nature of the lanthanide contraction is derived theoretically from Slater's model for the calculation of ionic radii. In addition, the sum of all distances along the edges of the coordination polyhedron show exactly the same quadratic dependency as the Ln-X bond lengths. The universal validity of this coordination sphere contraction, concomitant with the quadratic decrease in Ln-X bond lengths, was confirmed by reexamination of four other, previously published, almost complete series of lanthanide complexes. Due to the importance of multidentate ligands for the chelation of rare-earth metals, this result provides a significant advance for the prediction and rationalization of the geometric features of the corresponding lanthanide complexes, with great potential impact for all aspects of lanthanide coordination.},

doi = {10.1021/ja072750f},

journal = {Journal of the American Chemical Society},

issn = {0002-7863},

number = 36,

volume = 129,

place = {United States},

year = {2007},

month = {4}

}