Effect of linear and non-linear pseudohalides on the structural and magnetic properties of Co(ii) hexacoordinate single-molecule magnets

Dalton Transactions : an International Journal of Inorganic Chemistry
Lucia VáhovskáRadovan Herchel

Abstract

A series of mononuclear hexacoordinate Co(ii) complexes with the 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole (abpt) ligand and various linear and non-linear pseudohalides, such as NCSe (selenocyanate), N{C(CN)2}2(1,1,3,3-tetracyano-2-azapropenide, tcap), NO2C(CN)2(nitrodicyanomethanide, nodcm), C(CN){C(CN)2}2(1,1,2,3,3-pentacyanopropenide, pcp), NO2NCN (nitrocyanamide, nca), and ONC(CN)2(nitrosodicyanomethanide, ndcm), was prepared. X-ray analyses revealed the formation of the complexes with the general compositions [Co(abpt)2(solv)2]X2(solv = H2O and X = tcap (1), solv = H2O and X = nodcm (2), solv = CH3OH and X = pcp (3)) or [Co(abpt)2(X)2] (X = nca (4), X = NCSe (5), X = ndcm (6)). The impact of axial co-ligands (solv or X) on the magnetic properties was investigated experimentally by measuring temperature- and field-dependent static (DC) and dynamic magnetic (AC) data as well as theoretically using the CASSCF/NEVPT2, AILFT, and AOM methods. Large magnetic anisotropy was found for all complexes 1-6 and was treated either by the spin Hamiltonian or with the Hamiltonian including the orbital angular momentum. Furthermore, the AC susceptibility measurements confirmed the slow relaxation of the magnetization in a non-zero static m...Continue Reading

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Citations

Jan 10, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Anna SwitlickaMiguel Julve
Jan 16, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Pavel ZoufalýRadovan Herchel
Jan 7, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Barbora BrachňakováIvan Šalitroš
Mar 24, 2020·Chemistry, an Asian Journal·Xing-Cai HuangYi-Quan Zhang
Jun 30, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Hui-Hui CuiZi-Ling Xue

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Methods Mentioned

BETA
X-ray

Software Mentioned

ORCA
NEVPT2
SHELXL
PLATON
2014
CAS
CASSSCF
AOMX
AILFT
SUPERFLIP

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