Open AccessA 3D MOF based on Adamantoid Tetracopper(II) and Aminophosphine Oxide Cages: Structural Features and Magnetic and Catalytic Properties
Author(s) -
Ewelina I. Śliwa,
Dmytro S. Nesterov,
Marina V. Kirillova,
Julia Kłak,
Alexander M. Kirillov,
Piotr Smoleński
Publication year - 2021
Publication title -
inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 233
eISSN - 1520-510X
pISSN - 0020-1669
DOI - 10.1021/acs.inorgchem.1c00868
Subject(s) - chemistry , copper , catalysis , metal organic framework , crystallography , inductive coupling , ferromagnetism , density functional theory , oxide , inorganic chemistry , computational chemistry , organic chemistry , condensed matter physics , physics , adsorption , electrical engineering , engineering
This work describes an unexpected generation of a new 3D metal-organic framework (MOF), [Cu 4 (μ-Cl) 6 (μ 4 -O)Cu(OH) 2 (μ-PTA═O) 4 ] n ·2 n Cl-EtOH·2.5 n H 2 O, from copper(II) chloride and 1,3,5-triaza-7-phosphaadamantane 7-oxide (PTA═O). The obtained product is composed of diamandoid tetracopper(II) [Cu 4 (μ-Cl) 6 (μ 4 -O)] cages and monocopper(II) [Cu(OH) 2 ] units that are assembled, via the diamandoid μ-PTA═O linkers, into an intricate 3D net with an nbo topology. Magnetic susceptibility measurements on this MOF in the temperature range of 1.8-300 K reveal a ferromagnetic interaction ( J = +20 cm -1 ) between the neighboring copper(II) ions. Single-point DFT calculations disclose a strong delocalization of the spin density over the tetranuclear unit. The magnitude of exchange coupling, predicted from the broken-symmetry DFT studies, is in good agreement with the experimental data. This copper(II) compound also acts as an active catalyst for the mild oxidation and carboxylation of alkanes. The present study provides a unique example of an MOF that is assembled from two different types of adamantoid Cu 4 and PTA═O cages, thus contributing to widening a diversity of functional metal-organic frameworks.