Jump to main content
Jump to site search

Issue 42, 2016
Previous Article Next Article

Construction of copper chains with new fluorescent guanidino-functionalized naphthyridine ligands

Author affiliations

Abstract

The three new blue-fluorescent ligands 2,7-bis(tetramethylguanidino)-1,8-naphthyridine (1), 2,7-bis(N,N′-dimethylethylene-guanidino)-1,8-naphthyridine (2) and 2,7-bis(N,N′-diisopropylguanidino)-1,8-naphthyridine (3) are synthesized, and their optical properties (electronic absorption and emission spectroscopy) studied. Reactions of 1 or 2 with [Cu(CH3CN)4]BF4 yield the Cu4 chain compounds [Cu4(1)2](BF4)4 (that crystallizes as [Cu4(1)2(CH3CN)2](BF4)4·2CH2Cl2) and [Cu4(2)2](BF4)4. The variations of the optical properties upon coordination are evaluated, and the electronic transitions identified by time-dependent DFT (TD-DFT) calculations. Then the redox properties of the new Cu4 chain complexes are studied. In the course of these experiments, the new Cu6 complex [Cu4(1)2(CuCl2)2]2+, in which two CuCl2 units coordinate to the Cu4 chain in [Cu4(1)2]4+, was fully characterized. In addition, the Cu3 chain complexes [Cu3(1)3]3+ and [Cu3(1)2]3+ were isolated as products of redox-induced degradation processes. Finally, we show by quantum chemical calculations that in [M4(1)2]4+ complexes (M = coinage metal), the HOMO changes from a ligand-centered to a metal-centered orbital for replacement of M = Cu by Au.

Graphical abstract: Construction of copper chains with new fluorescent guanidino-functionalized naphthyridine ligands

Back to tab navigation

Supplementary files

Publication details

The article was received on 09 Aug 2016, accepted on 26 Sep 2016 and first published on 03 Oct 2016


Article type: Paper
DOI: 10.1039/C6DT03166H
Citation: Dalton Trans., 2016,45, 16966-16983
  •   Request permissions

    Construction of copper chains with new fluorescent guanidino-functionalized naphthyridine ligands

    C. Krämer, S. Leingang, O. Hübner, E. Kaifer, H. Wadepohl and H. Himmel, Dalton Trans., 2016, 45, 16966
    DOI: 10.1039/C6DT03166H

Search articles by author

Spotlight

Advertisements