| Title: |
Aluminium 8-Hydroxyquinolinate N-Oxide as a Precursor to Heterometallic Aluminium–Lanthanide Complexes |
| Authors: |
Gallo, Elisa; Bellucci, Luca; Carlotto, Silvia; Bottaro, Gregorio; Babetto, Luca; Giordano, Luca; Marchetti, Fabio; Samaritani, Simona; Armelao, Lidia; Labella, Luca |
| Contributors: |
Gallo, Elisa; Bellucci, Luca; Carlotto, Silvia; Bottaro, Gregorio; Babetto, Luca; Giordano, Luca; Marchetti, Fabio; Samaritani, Simona; Armelao, Lidia; Labella, Luca |
| Publisher Information: |
MDPI |
| Publication Year: |
2024 |
| Collection: |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
| Subject Terms: |
8-hydroxyquinoline N-oxide; aluminium; heterometallic complexe; lanthanide; quantum mechanical calculation; X-ray structure |
| Description: |
A reaction in anhydrous toluene between the formally unsaturated fragment [Ln(hfac)(3)] (Ln(3+) = Eu3+, Gd3+ and Er3+; Hhfac = hexafluoroacetylacetone) and [Al(qNO)(3)] (HqNO = 8-hydroxyquinoline N-oxide), here prepared for the first time from [Al((OBu)-Bu-t)(3)] and HqNO, affords the dinuclear heterometallic compounds [Ln(hfac)(3)Al(qNO)(3)] (Ln(3+) = Eu3+, Gd3+ and Er3+) in high yields. The molecular structures of these new compounds revealed a dinuclear species with three phenolic oxygen atoms bridging the two metal atoms. While the europium and gadolinium complexes show the coordination number (CN) 9 for the lanthanide centre, in the complex featuring the smaller erbium ion, only two oxygens bridge the two metal atoms for a resulting CN of 8. The reaction of [Eu(hfac)(3)] with [Alq(3)] (Hq = 8-hydroxyquinoline) in the same conditions yields a heterometallic product of composition [Eu(hfac)(3)Alq(3)]. A recrystallization attempt from hot heptane in air produced single crystals of two different morphologies and compositions: [Eu-2(hfac)(6)Al(2)q(4)(OH)(2)] and [Eu-2(hfac)(6)(mu -Hq)(2)]. The latter compound can be directly prepared from [Eu(hfac)(3)] and Hq at room temperature. Quantum mechanical calculations confirm (i) the higher stability of [Eu(hfac)(3)Al(qNO)(3)] vs. the corresponding [Eu(hfac)(3)Alq(3)] and (ii) the preference of the Er complexes for the CN 8, justifying the different behaviour in terms of the Lewis acidity of the metal centre. |
| Document Type: |
article in journal/newspaper |
| File Description: |
ELETTRONICO |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/pmid/38257364; info:eu-repo/semantics/altIdentifier/wos/WOS:001152748400001; volume:29; issue:2; firstpage:451; numberofpages:16; journal:MOLECULES; https://hdl.handle.net/11577/3508210 |
| DOI: |
10.3390/molecules29020451 |
| Availability: |
https://hdl.handle.net/11577/3508210; https://doi.org/10.3390/molecules29020451; https://www.mdpi.com/1420-3049/29/2/451 |
| Rights: |
info:eu-repo/semantics/openAccess ; license:Creative commons ; license uri:http://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.8CF5E5CC |
| Database: |
BASE |