Single Ion Anisotropy of CrIII and FeIII in a Series of {Ti7M} Rings

Andreas K. Kostopoulos; Grigore A. Timco; Floriana Tuna; Iñigo J. Vitórica-yrezábal; George F. S. Whitehead; Heiko Bamberger; Joris Van Slageren; David Collison; Eric J. L. Mcinnes; Richard E. P. Winpenny

doi:10.1007/s00723-020-01285-z

Single Ion Anisotropy of CrIII and FeIII in a Series of {Ti7M} Rings

Andreas K. Kostopoulos, Grigore A. Timco, Floriana Tuna, Iñigo J. Vitórica-yrezábal, George F. S. Whitehead, Heiko Bamberger, Joris Van Slageren, David Collison, Eric J. L. Mcinnes, Richard E. P. Winpenny

Research output: Contribution to journal › Article › peer-review

Abstract

A series of heterometallic [TiIV7MIII] rings are reported which contain a single paramagnetic metal centre, either FeIII or CrIII. The structures contain an octagon of metals bridged by oxides within the ring and pivalate ligands outside the ring. The structures encapsulate a single cation, either a secondary ammonium cation or a cesium. Multi-frequency EPR spectroscopy was used to measure the zero-field splitting parameters for the paramagnetic metal sites. The FeIII sites have rhombic anisotropy, with D around − 0.18 cm−1 and λ (= D/E) approximately 0.25. The CrIII have a more axial anisotropy, with D around − 0.5 cm−1 and λ around 0.05. Attempts to find a magneto-structural correlation are vitiated by the difficulty of refining the challenging crystal structures.

Original language	English
Pages (from-to)	1251-1265
Journal	Applied Magnetic Resonance
Volume	51
Issue number	11
Early online date	30 Oct 2020
DOIs	https://doi.org/10.1007/s00723-020-01285-z
Publication status	Published - 1 Nov 2020

Access to Document

10.1007/s00723-020-01285-zLicence: CC BY

http://link.springer.com/10.1007/s00723-020-01285-z

EPSRC National Research Facility for Electron Paramagnetic Resonance
Collison, D. (Academic lead), Mcinnes, E. (Academic lead), Tuna, F. (Academic lead), Bowen, A. (Academic lead), Shanmugam, M. (Senior Technical Specialist), Brookfield, A. (Technical Specialist), Fleming, E. (Other) & Cliff, M. (Platform Lead)
FSE Research
Facility/equipment: Facility

Cite this

@article{158cde6cb1c647cdb6144b6fd18d8b84,

title = "Single Ion Anisotropy of CrIII and FeIII in a Series of {Ti7M} Rings",

abstract = "A series of heterometallic [TiIV7MIII] rings are reported which contain a single paramagnetic metal centre, either FeIII or CrIII. The structures contain an octagon of metals bridged by oxides within the ring and pivalate ligands outside the ring. The structures encapsulate a single cation, either a secondary ammonium cation or a cesium. Multi-frequency EPR spectroscopy was used to measure the zero-field splitting parameters for the paramagnetic metal sites. The FeIII sites have rhombic anisotropy, with D around − 0.18 cm−1 and λ (= D/E) approximately 0.25. The CrIII have a more axial anisotropy, with D around − 0.5 cm−1 and λ around 0.05. Attempts to find a magneto-structural correlation are vitiated by the difficulty of refining the challenging crystal structures.",

author = "Kostopoulos, {Andreas K.} and Timco, {Grigore A.} and Floriana Tuna and Vit{\'o}rica-yrez{\'a}bal, {I{\~n}igo J.} and Whitehead, {George F. S.} and Heiko Bamberger and {Van Slageren}, Joris and David Collison and Mcinnes, {Eric J. L.} and Winpenny, {Richard E. P.}",

year = "2020",

month = nov,

day = "1",

doi = "10.1007/s00723-020-01285-z",

language = "English",

volume = "51",

pages = "1251--1265",

journal = "Applied Magnetic Resonance",

issn = "0937-9347",

publisher = "Springer Nature",

number = "11",

}

TY - JOUR

T1 - Single Ion Anisotropy of CrIII and FeIII in a Series of {Ti7M} Rings

AU - Kostopoulos, Andreas K.

AU - Timco, Grigore A.

AU - Tuna, Floriana

AU - Vitórica-yrezábal, Iñigo J.

AU - Whitehead, George F. S.

AU - Bamberger, Heiko

AU - Van Slageren, Joris

AU - Collison, David

AU - Mcinnes, Eric J. L.

AU - Winpenny, Richard E. P.

PY - 2020/11/1

Y1 - 2020/11/1

N2 - A series of heterometallic [TiIV7MIII] rings are reported which contain a single paramagnetic metal centre, either FeIII or CrIII. The structures contain an octagon of metals bridged by oxides within the ring and pivalate ligands outside the ring. The structures encapsulate a single cation, either a secondary ammonium cation or a cesium. Multi-frequency EPR spectroscopy was used to measure the zero-field splitting parameters for the paramagnetic metal sites. The FeIII sites have rhombic anisotropy, with D around − 0.18 cm−1 and λ (= D/E) approximately 0.25. The CrIII have a more axial anisotropy, with D around − 0.5 cm−1 and λ around 0.05. Attempts to find a magneto-structural correlation are vitiated by the difficulty of refining the challenging crystal structures.

AB - A series of heterometallic [TiIV7MIII] rings are reported which contain a single paramagnetic metal centre, either FeIII or CrIII. The structures contain an octagon of metals bridged by oxides within the ring and pivalate ligands outside the ring. The structures encapsulate a single cation, either a secondary ammonium cation or a cesium. Multi-frequency EPR spectroscopy was used to measure the zero-field splitting parameters for the paramagnetic metal sites. The FeIII sites have rhombic anisotropy, with D around − 0.18 cm−1 and λ (= D/E) approximately 0.25. The CrIII have a more axial anisotropy, with D around − 0.5 cm−1 and λ around 0.05. Attempts to find a magneto-structural correlation are vitiated by the difficulty of refining the challenging crystal structures.

U2 - 10.1007/s00723-020-01285-z

DO - 10.1007/s00723-020-01285-z

M3 - Article

SN - 0937-9347

VL - 51

SP - 1251

EP - 1265

JO - Applied Magnetic Resonance

JF - Applied Magnetic Resonance

IS - 11

ER -

Single Ion Anisotropy of CrIII and FeIII in a Series of {Ti7M} Rings

Abstract

Access to Document

Fingerprint

Equipment

EPSRC National Research Facility for Electron Paramagnetic Resonance

Cite this