Poly(ethylenimines) as Brønsted bases and as ligands for metal ions

Zelewsky, Alex von; Barbosa, L.; Schläpfer, C. W.

doi:10.1016/0010-8545(93)85057-b

Cited by 67 publications

(67 citation statements)

References 46 publications

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“…12 and 13). By changing the pH, we could remove between 60 and 70% of Cd(II) and Zn(II) ions with (1M, 4M) HClO 4 and (1M, 4M) HNO 3 . All of the other metal ions formed more stable complexes because only up to 50% of the metal ions were removed (see Fig.…”

Section: Metal-ion-uptake Propertiesmentioning

confidence: 99%

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Synthesis of water‐insoluble functional copolymers containing amide, amine, and carboxylic acid groups and their metal‐ion‐uptake properties

Rivas¹,

Villegas²,

Ruf³

2006

J of Applied Polymer Sci

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The crosslinked poly[N-(3-dimethylamino)-propylmethacrylamide] [P(NDAPA)] and poly [N-(3-dimethylamino)propylmethacrylamide-co-acrylic acid] [P(NDA-PA-co-AA)] were synthesized by radical polymerization. The resins were completely insoluble in water. The metalion-uptake properties were studied by a batch equilibrium procedure for the following metal ions: silver(I), copper(II), cadmium(II), zinc(II), lead(II), mercury(II), chromium(III), and aluminum(III). The P(NDAPA-co-AA) resin showed a lower metal-ion affinity than P(NDAPA), except for Hg(II), which was retained at 71% at pH 2. At pH 5, the resin showed a higher affinity for Pb(II) (80%) and Cu(II) (60%), but its affinity was very low for Zn(II) and Cr(III). The polymer ligand-metal-ion equilibrium was achieved during the first 20 min. By changing the pH, we found it possible to remove between 60 and 70% of Cd(II) and Zn(II) ions with (1M, 4M) HClO 4 and (1M, 4M) HNO 3 .

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Section: Metal-ion-uptake Propertiesmentioning

confidence: 99%

“…To remove the metal ions, HNO 3 and HClO 4 were used because these produce a change in pH and form a more stable salt with the metal ions. To recover the resin from the loaded metal-ion resins, the resins were eluted in acid media with protonic acid at different concentrations (see Figs.…”

Section: Metal-ion-uptake Propertiesmentioning

confidence: 99%

Synthesis of water‐insoluble functional copolymers containing amide, amine, and carboxylic acid groups and their metal‐ion‐uptake properties

Rivas¹,

Villegas²,

Ruf³

2006

J of Applied Polymer Sci

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“…The coordination chemistry of poly(ethyleneimines) with transition metal cations in aqueous solution has Aggregation of metal complexes has turned out to be a been investigated by Schläpfer et al, who suggests that powerful concept for the design and preparation of ex-these ligands have a considerable potential for technical aptended polymeric structures [1] . Such molecular arrays have plications [7] . The ability of polyalcohols such as the sugar been discussed in the context of crystal engineering and alcohols or the tripodal tris(hydroxymethyl)aminoethane to supramolecular chemistry [2] .…”

mentioning

confidence: 99%

Ligand Synthesis and Metal Complex Formation of 1,2,3-Triaminopropane

Zimmer

Müller

Reiß

et al. 1998

Eur. J. Inorg. Chem.

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A series of linear primary polyamines H2N–CH2–(CH–NH2)n–CH2–NH2 (1 ≤ n ≤ 3) was prepared from the corresponding polyalcohols. The polyamines were isolated as HCl adducts and the acidity constants in aqueous solution were determined. The crystal structure of the fully protonated tetraamine (n = 2) was elucidated by an X‐ray diffraction study. Complex formation of the triamine (n = 1) with Ni2+, Cu2+, Zn2+, Cd2+ was re‐investigated in aqueous solution. The pH‐dependent formation of a variety of species MxLyHz was established by potentiometric titrations and was compared with previous reports. The crystal structure of the Cu complex [CuL2]Cl2 exhibited a chain structure with a five‐coordinate CuII centre in which two amino groups of the triamine ligands are coordinated to one Cu centre, while the third amino group of one of the ligands is bonded to a neighbouring Cu atom. The compound shows weak antiferromagnetic coupling interactions between the CuII centres within the chain.

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“…Furthermore, the kinetics of chelate ring opening within the hexadentate Co 3 -penten complex with formation of [Co(penten)OH] 2 have been reported [8]. Additionally, poly(ethylenimines) with possible penten monomer units were studied as chelating ligands for different metal ions [9] [10].…”

mentioning

confidence: 99%

“…In contrast, the analogously less-stable PbH 2 L 4 is a stronger acid with pK values 7.79 and 7.92, vs. 8.56 and 9.54 for [AgH 2 L] 3 , in order to bind all six N-atoms in Pb(penten) 2 . 2.569 (9) A comparison of the MÀN distances in Tl 3 -tpen and Tl 3 -penten shows that the longest TlÀN bonds are found for N(21) and N(21a) of the central ethylenediamine unit (see Table 3). For the peripheral ligand N-atoms, the larger MÀN distances are found for tpen, as one would expect due to the larger steric strain caused by the aromatic amine.…”

mentioning

confidence: 99%

The Stability of MetalN,N,N′,N′-Tetrakis(2-aminoethyl)ethane- 1,2-diamine (=penten) Complexes and the X-Ray Crystal Structure of [Tl(NO3)(penten)](NO3)2

Gramlich¹,

Lubal²,

Musso³

et al. 2001

HCA

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Complex formation between N,N,N',N'-tetrakis(2-aminoethyl)ethane-1,2-diamine (penten) and the metal ions Mn 2 , Co 2 , Cu 2 , Zn 2 , Cd 2 , Hg 2 , Ag , Pb 2 , and Tl 3 (in 1.00m NaNO 3 and 258) was investigated by potentiometry and spectrophotometry. These are the first reported values of the stability constants for this ligand with Ag , Pb 2 , and Tl 3 . The X-ray crystal structure of [Tl(NO 3 )(penten)](NO 3 ) 2 was determined. In this structure, Tl 3 shows a coordination number of seven made up of the six N-donors and one O-atom of NO À 3 .

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Poly(ethylenimines) as Brønsted bases and as ligands for metal ions

Cited by 67 publications

References 46 publications

Synthesis of water‐insoluble functional copolymers containing amide, amine, and carboxylic acid groups and their metal‐ion‐uptake properties

Synthesis of water‐insoluble functional copolymers containing amide, amine, and carboxylic acid groups and their metal‐ion‐uptake properties

Ligand Synthesis and Metal Complex Formation of 1,2,3-Triaminopropane

The Stability of MetalN,N,N′,N′-Tetrakis(2-aminoethyl)ethane- 1,2-diamine (=penten) Complexes and the X-Ray Crystal Structure of [Tl(NO3)(penten)](NO3)2

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