Wydział Chemii

Akhilesh Kumar

Amit Rajput

Pawanjeet Kaur

Indresh Verma

Rohan D. Erande

Saleem Javed

Julia Kłak

Shefa' F. Alrebei

Antonio J. Mota

Enrique Colacio

Himanshu Arora

2023

Dalton Transactions

52

7225-7238

10.1039/d3dt00604b

Naukowa

Angielski

Artykuł

Two new complexes [Fe^III(Tp)(CN)₂(μ-CN)Mn^IICl(HL¹)]·3DMF (1) and {[Fe^III(Tp)(CN)(μ₂-NC)₂Cu^II(HL²)](ClO₄)}₂·6DMF (2) (HL¹ = 2-((((1-methylbenzimidazol-2-yl)methyl)(pyridin-2-ylmethyl)amino)methyl)phenol and HL² = 2-(((pyridin-2-ylmethyl)(quinolin-2-ylmethyl)-amino)methyl)phenol) have been synthesized and characterized by elemental analysis and IR and UV/vis spectroscopy. Structural analysis revealed that 1 is a discrete dinuclear coordination complex and 2 is a discrete tetranuclear coordination complex. In complex 1, each Mn^II is in a distorted octahedral MN₄OCl environment where coordination is satisfied by three nitrogen atoms and one oxygen atom of the ligand, and a chloride group and one nitrogen atom from cyanide. In complex 2, each Cu is in a distorted octahedral MN₅O environment where coordination is satisfied by three nitrogen atoms and one oxygen atom of the ligand, and two nitrogen atoms from two cyanides. Direct current (dc) variable-temperature magnetic susceptibility measurements on polycrystalline samples of 1 and 2 were carried out in the temperature range of 1.8–300 K. Investigation of the magnetic properties reveals the occurrence of weak antiferromagnetic coupling between the low-spin Fe^III (S = 1/2) ions and high-spin Mn^II (S = 5/2) ions in 1, while 2 exhibits ferro- and antiferromagnetic coupling between the metal ions in the tetranuclear Cu^II₂Fe^III₂ unit. DFT calculations show ferromagnetic coupling in both complexes, although this appears to be weak in the case of complex 1. In addition, magnetostructural correlations reveal the magnetic behavior against Mn–N–C and Fe–C–N angles in 1 and Cu–N–C and Fe–C–N angles in 2.

http://dx.doi.org/10.1039/D3DT00604B

https://www.rsc.org/