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Tetrazine derived mononuclear RuII(acac)2(L) (1), [RuII(bpy)2(L)](ClO4)2 (2) and [RuII(bpy)(L)2](ClO4)2 (3) (L = 3-amino-6-(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine, acac = acetylacetonate, bpy = 2,2′-bipyridine): syntheses, structures, spectra and redox properties

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Title Tetrazine derived mononuclear RuII(acac)2(L) (1), [RuII(bpy)2(L)](ClO4)2 (2) and [RuII(bpy)(L)2](ClO4)2 (3) (L = 3-amino-6-(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine, acac = acetylacetonate, bpy = 2,2′-bipyridine): syntheses, structures, spectra and redox properties
 
Creator NAYAK, ANIMESH
PATRA, SRIKANTA
SARKAR, BIPRAJIT
GHUMAAN, SANDEEP
PURANIK, VEDAVATI G
KAIM, WOLFGANG
LAHIRI, GOUTAM KUMAR
 
Subject ruthenium-tetrazine
synthesis
structure
electrochemistry
redox
spectra
 
Description Mononuclear ruthenium complexes of tetrazine derived L, RuII(acac)2(L) (1), [RuII(bpy)2(L)](ClO4)2 (2) and [RuII(bpy)(L)2](ClO4)2 (3) (L = 3-amino-6-(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine, acac = acetylacetonate and bpy = 2,2′-bipyridine) were prepared. The free L exists as a dimeric entity in the solid state via hydrogen bonding interactions involving L and water molecules present in the crystal lattice. 1 exhibits unusually strong bonds from RuII to coordinating pyrazolyl-N (2.040(2) Å) and especially to tetrazine-N (1.913(2) Å). The RuIII/RuII couples of 1–3 appeared at 0.28, 1.34 and 1.50 V versus SCE, respectively. The tetrazine and bpy-based reductions were observed at −1.33 (1); −0.55 and −1.55/−1.75/−1.98 (2); −0.47/−0.78 and −1.80/−2.02 V (3), respectively. 1, 2 and 3 displayed two MLCT bands each, corresponding to dπ(RuII) → π* (L, tetrazine) and dπ(RuII) → π* (acac or bpy or L) transitions. 1+ and 2+ showed rhombic EPR spectra at 110 and 4 K, respectively and 1−, 2− and 3− exhibited multiple line EPR spectra at 300 K. 1–3 exhibited moderately strong emission spectra in EtOH–MeOH glass at 77 K.
 
Publisher Elsevier
 
Date 2009-04-03T09:04:42Z
2011-11-25T20:36:31Z
2011-12-26T13:08:15Z
2011-12-27T05:56:15Z
2009-04-03T09:04:42Z
2011-11-25T20:36:31Z
2011-12-26T13:08:15Z
2011-12-27T05:56:15Z
2005
 
Type Article
 
Identifier Polyhedron 24(2), 333-342
0277-5387
http://dx.doi.org/10.1016/j.poly.2004.11.019
http://hdl.handle.net/10054/1120
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1120
 
Language en