Tuning the structure and magnetic properties via distinct pyridine derivatives in cobalt(II) coordination polymers

Shao, Dong1; Moorthy, Shruti2; Yang, Xiaodong1; Yang, Jiong3; Shi, Le4; Singh, Saurabh Kumar2; Tian, Zhengfang1

2021-12-01

10.1039/d1dt03489h

DALTON TRANSACTIONS   影响因子和分区

1477-9226

1477-9234

Precise modulation of the structure and magnetic properties of coordination compounds is of great importance in the development of framework magnetic materials. Herein, we report that the coordination self-assembly of a neutral cobalt(s) magnetic building block and selective pyridine derivatives as organic linkers has led to two distinct cobalt(s) coordination polymers, {Co(DClQ)(2)(bpy)}(n) (1) and {Co-2(DClQ))(4)(tpb)}(n) (2) (DClQ = (5,7-dichloro-8-hydroxyquinoline; bpy = 4, 4'-dipyridine; tpb = 1,2,4,5-tetra(4-pyridyl)benzene)). Structural analyses revealed that 1 and 2 are one-dimensional (1D) and 2D coordination polymers containing the same neutral magnetic building block (Co(DClQ)(2)] bridged by bitopic bpy and tetratopic tpb ligands, respectively. Both the complexes have a distorted octahedral CoN4O2 coordination geometry around each cobalt center offered by the bidentate ligand and organic linkers. Magnetic studies reveal large easy-plane and easy-axis magnetic anisotropy for 1 and 2, respectively. However, because of the weak antiferromagnetic coupling between the bpy-bridged Co-II centers, no slow relaxation of the magnetization was observed in 1 under both zero or applied dc fields. Interestingly, complex 2 exhibits slow magnetic relaxation under external fields, indicative of a framework single-ion magnet of 2. Theoretical calculations further support the experimental results and unveil that the D values are +65.3 and -91.2 cm(-1) for 1 and 2, respectively, while the magnetic exchange interaction was precisely estimated as -0.16 (1) and -0.009 (2) cm(-1). The foregoing results show that the structural dimensionality and magnetic properties can be rationally modified via pre-designed magnetic building blocks and a suitable choice of organic bridging ligands.

SCI ; EI

英语

其他

Huanggang Normal University[2042021033] ; Department of Science and Technology for the Start-up Research Grant[SRG/2020/001323]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000730765700001

ROYAL SOC CHEMISTRY

20220311472591

Ligands ; Magnetic anisotropy ; Magnetic materials ; Magnetic relaxation ; Magnetic susceptibility ; Magnetism ; Organic polymers ; Pyridine ; Self assembly

Magnetism: Basic Concepts and Phenomena:701.2 ; Magnetic Materials:708.4 ; Physical Chemistry:801.4 ; Organic Compounds:804.1 ; Organic Polymers:815.1.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

CHEMISTRY

Web of Science

1.Huanggang Normal Univ, Coll Chem & Chem Engn, Hubei Key Lab Proc & Applicat Catalyt Mat, Huanggang 438000, Peoples R China
2.Indian Inst Technol Hyderabad, Dept Chem, Sangareddy 502285, Telangana, India
3.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China
4.Jagiellonian Univ, Fac Chem, PL-30387 Krakow, Poland

Shao, Dong,Moorthy, Shruti,Yang, Xiaodong,et al. Tuning the structure and magnetic properties via distinct pyridine derivatives in cobalt(II) coordination polymers[J]. DALTON TRANSACTIONS,2021,51:695-704.

Shao, Dong.,Moorthy, Shruti.,Yang, Xiaodong.,Yang, Jiong.,Shi, Le.,...&Tian, Zhengfang.(2021).Tuning the structure and magnetic properties via distinct pyridine derivatives in cobalt(II) coordination polymers.DALTON TRANSACTIONS,51,695-704.

Shao, Dong,et al."Tuning the structure and magnetic properties via distinct pyridine derivatives in cobalt(II) coordination polymers".DALTON TRANSACTIONS 51(2021):695-704.