Rare nuclearities in Ni(II) cluster chemistry: an unprecedented {Ni12} nanosized cage from the use of N-naphthalidene-2-amino-5-chlorobenzoic acid.
The self-assembly reaction between NiI2, benzoic acid (PhCO2H) and the Schiff base chelate, N-naphthalidene-2-amino-5-chlorobenzoic acid (nacbH2), in the presence of the organic base triethylamine (NEt3), has resulted in the isolation and the structural, spectroscopic, and physicochemical characteri...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/173733 |
| Acceso en línea: | https://hdl.handle.net/2445/173733 |
| Access Level: | acceso abierto |
| Palabra clave: | Complexos metàl·lics Química de l'estat sòlid Propietats magnètiques Metal complexes Solid state chemistry Magnetic properties |
| Sumario: | The self-assembly reaction between NiI2, benzoic acid (PhCO2H) and the Schiff base chelate, N-naphthalidene-2-amino-5-chlorobenzoic acid (nacbH2), in the presence of the organic base triethylamine (NEt3), has resulted in the isolation and the structural, spectroscopic, and physicochemical characterization of the dodecanuclear [Ni12I2(OH)6(O2CPh)5(nacb)5(H2O)4(MeCN)4]I (1) cluster compound in ~30%yield. Complex 1 has a cage-like conformation, comprising twelvedistorted, octahedral NiII ions that are bridged by five 3-OH, one -OH, an I in 55% occupancy, five PhCO2 groups (under the 1: 1: , 1: 2: 3 and 2: 2: 4 modes), and the naphthoxido and carboxylato O-atoms of five doubly deprotonated nacb2 groups. The overall {Ni12} cluster exhibits a nanosized structure with a diameter of ~2.5 nm and its metallic core can be conveniently described as a series of nine edge- or vertex-sharing {Ni3} triangular subunits. Complex 1 is the highest nuclearity coordination compound bearing the nacbH2 chelate, and a rare example of polynuclear NiII complex containing coordinating I ions. Direct current (DC) magnetic susceptibility studies revealed the presence of predominant antiferromagnetic exchange interactions between the NiII ions, while photophysical studies of 1 in the solid-state showed a cyan-to-green centered emission at 520 nm, upon maximum excitation at 380 nm. The reported results demonstrate the rich coordination chemistry of the deprotonated nacb2 chelate in the presence of NiII metal ions, and the ability of this ligand to adopt a variety of di erent bridging modes, thus fostering the formation of high-nuclearity molecules with rare, nanosized dimensions and interesting physical (i.e., magnetic and optical) properties. |
|---|