Issue 32, 2013
From the journal:

RSC Advances

An indeno-quinoxaline based oximeligand for the synthesis of polynuclear Ni(ii) clusters†

Angelos B. Canaj,a   Lydia E. Nodaraki,a   Aggelos Philippidis,b   Demetrios I. Tzimopoulos,c   Eirini Fotopoulou,a   Milosz Siczek,d   Tadeusz Lisd  and  Constantinos J. Milios*a  

* Corresponding authors

a Department of Chemistry, University of Crete, 71003 Herakleion, Greece
E-mail: komil@chemistry.uoc.gr
Tel: +30-2810-545099

b Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (IESL-FORTH), GR 711 10 Herakleion, Greece

c Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece

d Faculty of Chemistry, University of Wroclaw, Joliot-Curie 14, 50-383 Wroclaw, Poland

Abstract

The reaction of Ni(OAc)2·4H2O with LH (LH = 11H-indeno[1,2-b]quinoxalin-11-one oxime) in a mixture of solvents comprising MeCN/MeOH (1 : 1) under solvothermal conditions in the presence of NEt3 forms the complex [Ni3(L)5(OAc)(MeOH)]·2.6MeCN·0.7MeOH·0.2H2O (1·2.6MeCN·0.7MeOH·0.2H2O) in moderate yield. Repeating the reaction in MeOH produces the complex [Ni6(L)6(OAc)4(OMe)2]·1.5MeOH·1.3H2O (2·1.5MeOH·1.3H2O) in good yield, while the reaction between Ni(ClO4)2·6H2O and LH in the presence of NEt3 in MeOH under solvothermal conditions yields complex [Ni5(L)6(OMe)2(OH)(H2O)2(MeOH)2](ClO4)·8.8MeOH·1.4H2O (3·8.8MeOH·1.4H2O). Furthermore, the reaction between Ni(ClO4)2·6H2O, LH and 2-amino-isobutyric acid, aibH, in MeCN in the presence of NEt3 forms complex [Ni7(L)7(aib)4(OH)(MeCN)0.5(H2O)0.5](ClO4)2·4MeCN·0.25H2O (4·4MeCN·0.25H2O) under high temperature/pressure, while the same reaction in MeOH yields complex [Ni8(L)8(aib)3(OMe)3](ClO4)2·0.75MeOH·4.2H2O (5·0.75MeOH·4.2H2O). Variable temperature dc magnetic susceptibility studies show that all 1–5 clusters display a small or a diamagnetic ground-state, S.

Graphical abstract: An indeno-quinoxaline based oxime ligand for the synthesis of polynuclear Ni(ii) clusters

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Article information

DOI
https://doi.org/10.1039/C3RA41455H
Article type
Paper
Submitted
25 Mar 2013
Accepted
01 May 2013
First published
02 May 2013

RSC Adv., 2013,3, 13214-13224

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An indeno-quinoxaline based oxime ligand for the synthesis of polynuclear Ni(II) clusters

A. B. Canaj, L. E. Nodaraki, A. Philippidis, D. I. Tzimopoulos, E. Fotopoulou, M. Siczek, T. Lis and C. J. Milios, RSC Adv., 2013, 3, 13214 DOI: 10.1039/C3RA41455H

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