Discrete and polymeric Cu(II) complexes featuring substituted indazole ligands: their synthesis and structural chemistry

Hawes, Chris S.; Kruger, Paul E.

Abstract

Reported here are the syntheses of four indazole-based ligands and the structural characterisation of four Cu(II) complexes derived from them. The ligands 1-(2-pyridyl)-1H-indazole, L1, and 2-(2-pyridyl)-2H-indazole, L2, have been characterised by single crystal X-ray diffraction methods for the first time. The intramolecular structural changes within L1 and L2 that result from the transition from the 1H to the 2H electronic configuration have been delineated. The synthesis of 1H-indazole-6-carboxylic acid, H2L3, and 1H-indazole-7-carboxylic acid, H2L4, is fully described and the structure of H2L4·H2O determined. The structures of two discrete mononuclear complexes {[Cu(L1)2(NO3)]·NO3·1.5H2O}, 1, and {[Cu(L2)2(NO3)]·NO3}, 2, have been determined and their molecular compositions corroborated by solution-based methods. Reaction of Cu(II) with H2L3 generates a 2D coordination polymer, [Cu3(HL3)4(NO3)2(EtOH)2]·3(C6H6)·2(H2O), 3, that features the archetypal [Cu2(OAc)4] paddlewheel motif and 1D channels; whereas reaction with H2L4 gives a discrete complex [Cu(HL4)2]·H2O·MeOH, 4, in which hydrogen bonding interactions link indazole dimers via a water molecule to yield a 1D network.

Citation

Hawes, C. S., & Kruger, P. E. (2014). Discrete and polymeric Cu(II) complexes featuring substituted indazole ligands: their synthesis and structural chemistry. Dalton Transactions, 43(43), 16450-16458. https://doi.org/10.1039/c4dt02428a

• Journal Article Type: Article
• Online Publication Date: Sep 16, 2014
• Publication Date: Nov 21, 2014
• Deposit Date: Jun 15, 2023
• Journal: DALTON TRANSACTIONS
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 43
• Issue: 43
• Pages: 16450-16458
• DOI: https://doi.org/10.1039/c4dt02428a
• Keywords: Inorganic Chemistry
• Additional Information: : This document is CrossCheck deposited; : Supplementary Information; : Crystal Structure Data; : Paul E. Kruger (ResearcherID); : The Royal Society of Chemistry has an exclusive publication licence for this journal; : Received 9 August 2014; Accepted 16 September 2014; Accepted Manuscript published 16 September 2014; Advance Article published 24 September 2014; Version of Record published 14 October 2014