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Anion binding by metallo-receptors of 5,5′-dicarbamate-2,2′-bipyridine ligands
- Source :
- Dalton Transactions. 40:5687
- Publication Year :
- 2011
- Publisher :
- Royal Society of Chemistry (RSC), 2011.
-
Abstract
- Three 5,5'-dicarbamate-2,2'-bipyridine ligands (L = L(1)-L(3)) bearing ethyl, isopropyl or tert-butyl terminals, respectively, on the carbamate substituents were synthesized. Reaction of the ligands L with the transition metal ions M = Fe(2+), Cu(2+), Zn(2+) or Ru(2+) gave the complexes ML(n)X(2)·xG (1-12, n = 1-3; X = Cl, NO(3), ClO(4), BF(4), PF(6), ½SO(4); G = Et(2)O, DMSO, CH(3)OH, H(2)O), of which [Fe(L(2))(3) ⊃ SO(4)]·8.5H(2)O (2), [Fe(L(1))(3) ⊃ (BF(4))(2)]·2CH(3)OH (7), [Fe(L(2))(3) ⊃ (Et(2)O)(2)](BF(4))(2)·2CH(3)OH (8), [ZnCl(2)(L(1))][ZnCl(2)(L(1))(DMSO)]·2DMSO (9), [Zn(L(1))(3) ⊃ (NO(3))(2)]·2H(2)O (10), [Zn(L(2))(3) ⊃ (ClO(4))(Et(2)O)]ClO(4)·Et(2)O·2CH(3)OH·1.5H(2)O (11), and [Cu(L(1))(2)(DMSO)](ClO(4))(2)·2DMSO (12) were elucidated by single-crystal X-ray crystallography. In the complexes ML(n)X(2)·xG the metal ion is coordinated by n = 1, 2 or 3 chelating bipyridine moieties (with other anionic or solvent ligands for n = 1 and 2) depending on the transition metal and reaction conditions. Interestingly, the carbamate functionalities are involved in hydrogen bonding with various guests (anions or solvents), especially in the tris(chelate) complexes which feature the well-organized C(3)-clefts for effective guest inclusion. Moreover, the anion binding behavior of the pre-organized tris(chelate) complexes was investigated in solution by fluorescence titration using the emissive [RuL(3)](2+) moiety as a probe. The results show that fluorescent recognition of anion in solution can be achieved by the Ru(II) complexes which exhibit good selectivities for SO(4)(2-).
- Subjects :
- Anions
Magnetic Resonance Spectroscopy
Stereochemistry
Chemistry
Hydrogen bond
Molecular Conformation
Crystallography, X-Ray
Ligands
Medicinal chemistry
2,2'-Bipyridine
Inorganic Chemistry
Bipyridine
chemistry.chemical_compound
2,2'-Dipyridyl
Transition metal
Coordination Complexes
Moiety
Chelation
Carbamates
Anion binding
Isopropyl
Subjects
Details
- ISSN :
- 14779234 and 14779226
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Dalton Transactions
- Accession number :
- edsair.doi.dedup.....adaf129e46ec7a395305ebff6b0cc931