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- Title
A Metal-organic Framework with Paddle-wheel Zn<sub>2</sub>(CO<sub>2</sub>)<sub>4</sub> Secondary Building Units and Cubane-1,4-dicarboxylic Acid Linkers.
- Authors
Földes, Dávid; Kováts, Éva; Bortel, Gábor; Jakab, Emma; Pekker, Sándor
- Abstract
A new crystal structure of catena-(bis((µ4-cubane-1,4-dicarboxylato)-(N-methyl-2-pyrrolidone)-zinc(II)) N-methyl-2-pyrrolidone solvate) (1) was prepared by solvothermal method. The crystal structure of the compound was analyzed by single-crystal X-ray diffraction. It has a P1 space group, with lattice parameters a = 10.7190(4) Å, b = 10.8245(5) Å, c = 10.8403(8) Å, a = 80.291(5)°, ß = 70.0015(5)°, γ = 77.531(4)°, V = 1147.97(12) ų. The secondary building units of 1 consist of 2 central Zn ions, coordinated by 4 carboxylate groups in a bis-monodentate way, forming a square planar configuration of Zn2(CO2)4, known as paddle-wheel units. The paddle-wheels are connected by cubane-1,4-dicarboxylic acid linkers at the edges, resulting in a two-dimensional coordination polymer with a square lattice (sql) underlying network topology. The axial sites of the zinc atoms are occupied by N-methyl-2-pyrrolidone molecules. In this new crystal structure the two-dimensional polymer planes are interstacked by weak dispersion bonds. The axial N-methyl- 2-pyrrolidone solvent molecules determine the distances of planar polymer planes. The thermal properties of this new structure were studied by thermogravimetry/mass spectrometry in inert atmosphere. It was found, that the organic linkers in the framework structure do not decompose below 200 °C. The stochiometry of the activated compound is Zn2[C8H6(COO)2]2(C5H9NO)2, as determined by thermogravimetry in oxidative atmosphere.
- Subjects
METAL-organic frameworks; COORDINATION polymers; STRUCTURAL frames; LATTICE constants; MASS spectrometry; SOLVATION
- Publication
Periodica Polytechnica: Chemical Engineering, 2019, Vol 63, Issue 3, p365
- ISSN
0324-5853
- Publication type
Article
- DOI
10.3311/PPch.13075