Construction of copper chains with new fluorescent guanidino-functionalized naphthyridine ligands
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 sp...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
03 Oct 2016
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| In: |
Dalton transactions
Year: 2016, Volume: 45, Issue: 42, Pages: 16966-16983 |
| ISSN: | 1477-9226 |
| DOI: | 10.1039/C6DT03166H |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/C6DT03166H Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2016/dt/c6dt03166h 
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| Author Notes: | Christoph Krämer, Simone Leingang, Olaf Hübner, Elisabeth Kaifer, Hubert Wadepohl and Hans-Jörg Himmel |
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| 245 | 1 | 0 | |a Construction of copper chains with new fluorescent guanidino-functionalized naphthyridine ligands |c Christoph Krämer, Simone Leingang, Olaf Hübner, Elisabeth Kaifer, Hubert Wadepohl and Hans-Jörg Himmel |
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| 520 | |a 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. | ||
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