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

Canaj, A. B. , Nodaraki, L. E., Philippidis, A., Tzimopoulos, D. I., Fotopoulou, E., Siczek, M., Lis, T. and Milios, C. J. (2013) An indeno-quinoxaline based oxime ligand for the synthesis of polynuclear Ni(ii) clusters. RSC Advances, 3(32), 13214. (doi: 10.1039/c3ra41455h)

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.

• Item Type: Articles
• Additional Information: CJM would like to thank The Excellence Grant (ARISTEIA-2691) for funding.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Tsanai, Dr Angelos
• Authors: Canaj, A. B., Nodaraki, L. E., Philippidis, A., Tzimopoulos, D. I., Fotopoulou, E., Siczek, M., Lis, T., and Milios, C. J.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: RSC Advances
• Publisher: Royal Society of Chemistry
• ISSN: 2046-2069
• ISSN (Online): 2046-2069