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Role of coordination geometry on the magnetic relaxation dynamics of isomeric five-coordinate low-spin Co(II) complexes

To investigate the influence of the coordination geometry on the magnetization relaxation dynamics, two geometric isomers of a five-coordinate low-spin Co(II) complex with the general molecular formula [Co(DPPE)2Cl]SnCl3 (DPPE = diphenylphosphinoethane) were synthesized and structurally characterize...

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Main Authors: Spillecke, Lena (Author) , Tripathi, Shalini (Author) , Koo, Changhyun (Author) , Bahr, Arne (Author) , Swain, Abinash (Author) , Haldar, Rajashi (Author) , Ansari, Mursaleem (Author) , Jasinski, Jerry (Author) , Rajaraman, Gopalan (Author) , Shanmugam, Maheswaran (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 2022
In: Inorganic chemistry
Year: 2022, Volume: 61, Issue: 1, Pages: 317-327
ISSN:1520-510X
DOI:10.1021/acs.inorgchem.1c02881
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.inorgchem.1c02881
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Author Notes:Lena Spillecke, Shalini Tripathi, Changhyun Koo, Arne Bahr, Abinash Swain, Rajashi Haldar, Mursaleem Ansari, Jerry Jasinski, Gopalan Rajaraman, Maheswaran Shanmugam, and Rüdiger Klingeler
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Summary:To investigate the influence of the coordination geometry on the magnetization relaxation dynamics, two geometric isomers of a five-coordinate low-spin Co(II) complex with the general molecular formula [Co(DPPE)2Cl]SnCl3 (DPPE = diphenylphosphinoethane) were synthesized and structurally characterized. While one isomer has a square pyramidal geometry (Co-SP (1)), the other isomer figures a trigonal bipyramidal geometry (Co-TBP (2)). Both complexes were already reported elsewhere. The spin state of these complexes is unambiguously determined by detailed direct current (dc) magnetic data, X-band, and high-frequency EPR measurements. Slow relaxation of magnetization is commonly observed for systems with S > 1/2. However, both 1 and 2 show field-induced slow relaxation of magnetization. Especially 1 shows relaxation times up to τ = 35 ms at T = 1.8 K, which is much longer than the reported values for undiluted Co(II) low-spin monomers. In 2, the maximal field-induced relaxation time is suppressed to τ = 5 ms. We attribute this to the change in g-anisotropy, which is, in turn, correlated to the spatial arrangement of ligands (i.e., coordination geometry) around the Co(II) ions. Besides the detailed electronic structure of these complexes, the experimental observations are further corroborated by theoretical calculations.
Item Description:Published: December 17, 2021
Gesehen am 18.07.2022
Physical Description:Online Resource
ISSN:1520-510X
DOI:10.1021/acs.inorgchem.1c02881

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