Issue 42, 2020

Lanthanide complexes based on a new bis-chelating carbacylamidophosphate (CAPh) scorpionate-like ligand

Abstract

The novel bis-chelating carbacylamidophosphate type ligand, tetramethyl[pyridine-2,6-diyldi(iminocarbonyl)]diamidophosphate (H2L), and its sodium salt, NaHL, have been synthesized and their structural properties have been investigated. Coordination compounds of lanthanides [Ln(HL)2NO3]·i-PrOH (Ln = Eu3+, Tb3+) were obtained for the first time, isolated in the individual state and characterized by means of IR and NMR spectroscopies, electrospray ionization mass spectrometry (ESI-MS), potentiometric titration, and elemental, thermal gravimetric and X-ray diffraction analyses. It was shown that H2L behaves like a scorpionate type ligand and in a mono-deprotonated form coordinates in a tridentate manner via the oxygen atoms of phosphoryl and carbonyl groups with formation of a mononuclear metal complex. The protonation constants of H2L and stability constants of Eu3+ and Tb3+ complexes have been determined. According to the results of X-ray diffraction analysis the H2L and [Ln(HL)2NO3]·i-PrOH molecules have monomeric structure but NaHL is a dimer. The Hirshfeld surface and fingerprint plots of the compounds have been used to analyze various hydrogen bonds and intermolecular interactions displayed in the crystal structure.

Graphical abstract: Lanthanide complexes based on a new bis-chelating carbacylamidophosphate (CAPh) scorpionate-like ligand

Supplementary files

Article information

Article type
Paper
Submitted
28 May 2020
Accepted
19 Jun 2020
First published
29 Jun 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 24808-24816

Lanthanide complexes based on a new bis-chelating carbacylamidophosphate (CAPh) scorpionate-like ligand

I. Olyshevets, V. Ovchynnikov, N. Kariaka, V. Dyakonenko, S. Shishkina, T. Sliva, M. Ostrowska, A. Jedyńczuk, E. Gumienna-Kontecka and V. Amirkhanov, RSC Adv., 2020, 10, 24808 DOI: 10.1039/D0RA04714G

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