Synthesis, Structure and Binding Properties of Nickel and Copper [14]Cyclidene Complexes with Appended Aza Crown Ethers

Korybut‐Daszkiewicz, Bohdan; Taraszewska, Joanna; Zięba, Katarzyna; Makal, Anna; Woźniak, Krzysztof

doi:10.1002/ejic.200300955

Cited by 10 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…À anions are few compared with compounds with weakly coordinated AF 6 2À dianions, 104,[106][107][108][109][110][111][112][113][114][115][116] which suggests that the PF 6 À anion is a weak Lewis base. To evaluate the relative strength of Lewis basicity of the PF 6 À anion, we recently determined the donor number (DN) of this anion.…”

Section: Binding Of Weak Lewis Base Anions At Cu(ii) Axial Positions ...mentioning

confidence: 99%

Rational synthesis and characterization of porous Cu(ii) coordination polymers

Noro

2010

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Porous coordination polymers or metal-organic frameworks constructed from metal ions and organic ligands have attracted much attention as next-generation porous materials due to their high designability, regularity, flexibility, and porosity. In particular, the Cu(II) ion with Jahn-Teller distortion can offer unique functions (coordination flexibility, Lewis acid property, and polarity) to porous frameworks. In this Perspective, we focus on porous Cu(II) coordination polymers; their unique characteristics and potential future applications are illustrated by recent experimental results.

show abstract

Section: Binding Of Weak Lewis Base Anions At Cu(ii) Axial Positions ...mentioning

confidence: 99%

Rational synthesis and characterization of porous Cu(ii) coordination polymers

Noro

2010

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…21 Here, the carboxylate coordination is enforced by an appended crown-ether moiety which binds the NH 3 + group via three strong NH⋯O hydrogen-bonding interactions. 22 The coordination modes of di-, tri-, and tetrapeptide ligands are more diverse as one might expect. In the absence of supporting ligands, the peptides generally act as chelate ligands, with a terminal N, one or more deprotonated amide ions and/or the carboxylato group.…”

Section: Introductionmentioning

confidence: 99%

Selective complexation of α-amino acids and simple peptides via their carboxylate groups

2014

View full text Add to dashboard Cite

The complexation of anions of selected α-amino acids (alanine, valine, proline, tyrosine) and small peptides (L-alanyl-L-alanine, L-alanyl-L-alanyl-L-alanine, and L-alanyl-L-alanyl-L-alanyl-L-alanine) by the dinuclear nickel(II) complex [LNi2(μ-Cl)]+ (1), where (L)2− represents a 24-membered binucleating hexamine-dithiophenolato ligand, has been investigated. The following complexes were prepared, isolated as perchlorate or tetraphenylborate salts, and characterized by UV/Vis, IR, and CD spectroscopy: [LNi2(μ-L-alaninato)]+ (2), [LNi2(μ-L-valinato)]+ (3), [LNi2(μ-L-prolinato)]+ (4), [LNi2(μ-L-tyrosinato)]+ (5a), [LNi2(μ-D-tyrosinato)]+ (5b), [LNi2(μ-L,D-tyrosinato)]+ (5c), [LNi2(μ-L-alanyl-L-alaninato)]+ (6), [LNi2(μ-(L-alanyl)2-L-alaninato)]+ (7), [LNi2(μ-(L-alanyl)3-L-alaninato)]+ (8). Compounds 4, 5a and 6 were additionally identified by X-ray crystallography. In contrast to unsupported amino carboxylate complexes which typically contain five membered NO chelate rings, the [LNi2]2+ fragment selectively binds the α-amino acids and peptides via μ1,3-bridging carboxylato groups. Coordination of the carboxylato coligands in this way confers dissymmetry on the complexes. The CD spectra of the syn,syn-bridged structures are significantly different from those of the NO chelates, and can distinguish between the two coordination modes. The encapsulation of the peptides increases their solubility in the solvent system MeOH–MeCN by up to two orders of magnitude. This is discussed in terms of the absence of intermolecular hydrogen bonding interactions as indicated in the X-ray structure of 6.

show abstract

Flexible Mono‐ and Bis‐tetraazamacrocyclic Complexes of Copper and Nickel Stabilizing Different Oxidation States

et al. 2012

View full text Add to dashboard Cite

The synthesis and structural properties of new mono‐ and bis‐macrocyclic cyclidene complexes of copper(II) andnickel(II) are presented. The compounds with aliphatic ligands are flexible enough to stabilize metal centers in the three oxidation states +1, +2, and +3. All the electron‐transfer processes in the 16‐membered mono‐ and binuclear macrocyclic complexes of copper(II) and nickel(II) were fast and reversible. Two polymorphic forms of the 16‐membered mononuclear complex of nickel(II) were isolated in the solid state and characterized. The 16‐membered macrocyclic complexes show both U‐ and Z‐shape conformations. The deviation of the macrocyclic ligand from planarity affects the electrochemical properties of the complexes and leads to stabilization of different oxidation states of the Cu and Ni metal centers. Substitution of the exocyclic nitrogen atoms with a second alkyl group increases the deviation from planarity and induces rotation of the functional groups at the meso position relative to the macrocyclic ring. In the bis‐macrocyclic complexes, the electron‐donating properties are improved and the formal potential of the metal(II)/metal(III) system is less positive with increasing linker length between the macrocyclic units. The acceptor properties of the metal(II) complexes are weaker, the formal potential of the metal(II)/metal(I) couple being shifted to more negative values.

show abstract

Synthesis, Structure and Binding Properties of Nickel and Copper [14]Cyclidene Complexes with Appended Aza Crown Ethers

Cited by 10 publications

References 24 publications

Rational synthesis and characterization of porous Cu(ii) coordination polymers

Rational synthesis and characterization of porous Cu(ii) coordination polymers

Selective complexation of α-amino acids and simple peptides via their carboxylate groups

Flexible Mono‐ and Bis‐tetraazamacrocyclic Complexes of Copper and Nickel Stabilizing Different Oxidation States

Contact Info

Product

Resources

About