Back to Search
Start Over
Synthesis and spectroscopic properties of two different structural Schiff base Zn(II) complexes constructed with/without auxiliary ligands
- Source :
- Journal of Molecular Structure. 1230:129627
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The Schiff base binuclear Zn(II) complexes, [Zn2(L)2∙(H2O)2]∙2DMF (1) and its coordination polymer [Zn2(L)2∙(4,4′-bpy)2]n (2) (H2L = 3-[(5-chloro-2-hydroxy-benzylidene)-amino]-4-hydroxy-chromen-2-one, 4,4′-bpy = 4,4′-bipyridine), were synthesized under the same experimental condition without or with the auxiliary ligand 4,4′-bpy, respectively. The structural analysis revealed that complexes 1 and 2 have different crystal structures. The complex 1 was a centrosymmetric binuclear structure. It is noteworthy that the linker 4,4′-bpy was introduced during the synthesis of complex 2, so that two water molecules in complex 1 were replaced by two 4,4′-bpy linkers to form one-dimensional (1D) chain-like coordination polymer. The central Zn(II) ions in complex 1 were penta-coordinated distorted square pyramid geometry with τ = 0.42. However, the Zn(II) ions of complex 2 were hexa-coordinated distorted octahedral geometry. The fluorescence spectrum showed the complex 2 containing 4,4′-bpy was substantially quenching of the fluorescence as compared with the complex 1. In addition, it could be seen from the DFT calculation the energy gaps of the complexes 1 and 2 were both reduced compared to the ligand H2L. However, the LUMO and HOMO orbits of the complex 2 were occupied by the 4,4′-bpy, which is different from complex 1, resulting in 1 and 2 had different spectral properties.
- Subjects :
- Schiff base
010405 organic chemistry
Coordination polymer
Ligand
Organic Chemistry
Crystal structure
010402 general chemistry
01 natural sciences
0104 chemical sciences
Analytical Chemistry
Inorganic Chemistry
chemistry.chemical_compound
Crystallography
chemistry
Square pyramid
Octahedral molecular geometry
Molecule
HOMO/LUMO
Spectroscopy
Subjects
Details
- ISSN :
- 00222860
- Volume :
- 1230
- Database :
- OpenAIRE
- Journal :
- Journal of Molecular Structure
- Accession number :
- edsair.doi...........6d37acbaee77266143cbe3214d55a6ab