Ten complexes constructed by two reduced Schiff base tetraazamacrocycle ligands: syntheses, structures, magnetic and luminescent properties

Liu, Yingying; Ma, Jianjun; Ma, Jian‐Fang

doi:10.1080/00958972.2013.859680

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…As shown in Figure 3a, each central Mn II atom is five‐coordinated by four carboxylate oxygen atoms from four L 1 anions and one nitrogen atom from biim‐3 ligand, showing a distorted square‐pyramidal arrangement (τ = 0.110, τ = 0 and 1 for perfect square‐pyramidal and trigonal‐bipyramidal environments, respectively) 9. Each L anion bridges four Mn II ions with two carboxylate groups exhibiting bidentate coordination modes.…”

Section: Resultsmentioning

confidence: 99%

Syntheses and Structures of Coordination Polymers Constructed by Semi‐Rigid Bicarboxylic Acid Ligands

Liu

Yang

2014

Zeitschrift anorg allge chemie

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Section: Resultsmentioning

confidence: 99%

Syntheses and Structures of Coordination Polymers Constructed by Semi‐Rigid Bicarboxylic Acid Ligands

Liu

Yang

2014

Zeitschrift anorg allge chemie

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New polyaminocarboxylate macrocycles containing phenolate binding units: synthesis, luminescent and relaxometric properties of their lanthanide complexes

et al. 2017

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The synthesis of two new polyaminocarboxylate macrocycles incorporating one or two intracyclic phenol units (HL and HL, respectively) is described. The 12-membered HL macrocycle leads to soluble and stable mononuclear Ln complexes of [(L)Ln(HO)] composition (Ln = Eu, Tb and Gd) in aqueous solutions. In Tris buffer (pH 7.4), the [(L)Tb(HO)] complex displays a suitable efficiency for sensitized emission (η = 48%) and a high luminescence quantum yield (Φ = 22%), which is worthy of note for a bis-hydrated terbium complex. Besides, luminescence experiments show that bidentate endogenous anions (citrate, carbonate, and phosphate) do not displace the two inner-sphere water molecules of this complex. In contrast, the possible presence of LMCT states causes the europium complex to be weakly luminescent. The [(L)Gd(HO)] complex is characterized by high relaxivity (r = 7.2 s mM at 20 MHz) and a very short water residence time of the coordinated water molecules (τ = 9 ns), promising values for the realisation of macromolecular systems with high relaxivities. Thus, the Tb and Gd complexes of the HL macrocycle exhibit several improvements in terms of luminescent (lower excitation energy, higher brightness) and relaxometric (shorter τ) properties compared to the corresponding LnPCTA complexes, where a phenol moiety substitutes a pyridine ring. On the other hand, the 24-membered HL macrocycle including two phenol units in its structure leads to dinuclear complexes of [(L)Ln] composition. Its terbium complex shows a long luminescence lifetime (2 ms) and a high quantum yield (43%) in aqueous solutions, making this compound a new promising candidate for time-resolved applications.

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Asymmetric bis-(μ_1,1-azido) bridged dinuclear copper(II) complex with N₂O donor Schiff base: synthesis, structure and magnetic study

Das

Shaw

Ghosh

et al. 2015

Journal of Coordination Chemistry

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Ten complexes constructed by two reduced Schiff base tetraazamacrocycle ligands: syntheses, structures, magnetic and luminescent properties

Cited by 5 publications

References 13 publications

Syntheses and Structures of Coordination Polymers Constructed by Semi‐Rigid Bicarboxylic Acid Ligands

Syntheses and Structures of Coordination Polymers Constructed by Semi‐Rigid Bicarboxylic Acid Ligands

New polyaminocarboxylate macrocycles containing phenolate binding units: synthesis, luminescent and relaxometric properties of their lanthanide complexes

Asymmetric bis-(μ_1,1-azido) bridged dinuclear copper(II) complex with N₂O donor Schiff base: synthesis, structure and magnetic study

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Ten complexes constructed by two reduced Schiff base tetraazamacrocycle ligands: syntheses, structures, magnetic and luminescent properties

Cited by 5 publications

References 13 publications

Syntheses and Structures of Coordination Polymers Constructed by Semi‐Rigid Bicarboxylic Acid Ligands

Syntheses and Structures of Coordination Polymers Constructed by Semi‐Rigid Bicarboxylic Acid Ligands

New polyaminocarboxylate macrocycles containing phenolate binding units: synthesis, luminescent and relaxometric properties of their lanthanide complexes

Asymmetric bis-(μ1,1-azido) bridged dinuclear copper(II) complex with N2O donor Schiff base: synthesis, structure and magnetic study

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Asymmetric bis-(μ_1,1-azido) bridged dinuclear copper(II) complex with N₂O donor Schiff base: synthesis, structure and magnetic study