Acrylonitrile copolymers using cobalt acetylacetonate-triethylaluminum initiator system

Nagabhushanam, Kalyanam; Gandhi, V. G.; Sivaram, Swaminathan

doi:10.1007/bf00258015

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Since then, the chemistry of these simple molecules has been heavily explored for a number of applications. , Acetylacetones are chemically simple and tunable ligands, prone to structural modifications by replacing their α-hydrogen atoms or the methyl groups with other fragments. Such chemical flexibility allows the fine-tuning of several properties such as solubility, volatility, color, and melting point of the resultant metal complexes. − At present, they are used as starting materials for the synthesis of nanoparticles, they have a relevant role in polymeric production processes, − and are used as catalysts precursors in many organic syntheses. − The most characterized and studied complexes contain 3d metals, − even though some examples are reported also for the second transition series. , For 5d elements there are only a few examples in the literature. − …”

Section: Introductionmentioning

confidence: 99%

Osmium(III) Acetylacetonate and Its Missing Polymorph: A Magnetic and Structural Investigation

Raza,

Chelazzi,

Ciattini

et al. 2024

Inorg. Chem.

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Despite the potential for their application, the magnetic behavior of complexes containing 4d and 5d metal ions is underexplored, evidencing the need for benchmark multitechnique studies on simple molecules. We report here a structural and magnetic study on osmium(III) acetylacetonate [Os(acac) 3 ]. X-ray single crystal diffraction did not allow us to determine the structure of the β-polymorph of [Os(acac) 3 ]. The combined magnetic (dc magnetic measurements on powder and cantilever torque magnetometry on single crystal) and spectroscopic (electron paramagnetic resonance, EPR) characterization is here used to provide further evidence that its structure is indeed the one of the orthorhombic "missing polymorph", analogous to the ruthenium(III) derivative. Our study shows that all acetylacetonate complexes of the eighth group of the periodic table show dimorphism and are isomorphic. The EPR characterization allowed the experimental assessment of the easy axis nature of the ground doublet and the determination of the first hyperfine coupling in an osmium complex. Torque magnetometry, applied here for the first time on an osmium-based molecule, determined the orientation of the easy axis along the pseudo C 3 axis of the complex. Ac magnetometric measurements revealed in-field slow relaxation of the magnetization further slowed by the suppression of dipolar fields via magnetic dilution in the isostructural gallium(III) analogue.

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Section: Introductionmentioning

confidence: 99%

Osmium(III) Acetylacetonate and Its Missing Polymorph: A Magnetic and Structural Investigation

Raza,

Chelazzi,

Ciattini

et al. 2024

Inorg. Chem.

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“…Zn(acac) 2 is used as an initiator for ring‐opening polymerization in the synthesis of high‐molecular‐weight polycarbonates, catalyst for chain extension of polyesters, and latent accelerator for anhydride‐cured epoxy resins . Co(acac) 3 can be used as a catalyst in the synthesis of styrene–acrylonitrile copolymers and initiator for graft copolymerization of 4‐vinylpyridine onto cellulose …”

Section: Introductionmentioning

confidence: 99%

Metal acetylacetonate–amine and metal nitrate–amine complexes as low‐emission catalysts for rigid polyurethane foam preparation

Sridaeng

Limsirinawa

Sirojpornphasut

et al. 2015

J of Applied Polymer Sci

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Six metal-amine complexes, Cu(acac) 2 (trien), Zn(acac) 2 (en), Zn(acac) 2 (trien), Cu(NO 3 ) 2 (en) 2 , Cu(NO 3 ) 2 (trien), and Cu(NO 3 ) 2 (tetraen), are synthesized from metal acetylacetonates [M(acac) 2 , where M 5 Cu and Zn] or metal nitrate [M(NO 3 ) 2 , where M 5 Cu] and aliphatic amines (en 5 ethylenediamine, trien 5 triethylenetetramine, and tetraen 5 tetraethylenepentamine). These metal-amine complexes can be used as catalysts in the preparation of rigid polyurethane (RPUR) foams. All metal-amine complexes emit very weak odor when compared with N,N-dimethylcyclohexylamine (DMCHA), which is a commercial catalyst commonly used in the preparation of RPUR foams. DMCHA emits very strong amine odor that affects working environment in RPUR foam processing. Among all metal complexes, Cu(acac) 2 (trien) has the highest catalytic activity. In comparison with DMCHA, Cu(acac) 2 (trien) shows slightly higher catalytic activity in gelling reaction but lower catalytic activity in blowing reaction. RPUR foam prepared from Cu(acac) 2 (trien) has lower density and compressive strength than that prepared from DMCHA. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42332.

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Fourier-transform Raman Spectroscopic Study of the Association Between Co(II) Ions and Acrylonitrile in Aqueous Solution

Alía

Edwards

Moore

1997

Progress in Fourier Transform Spectroscopy

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Acrylonitrile copolymers using cobalt acetylacetonate-triethylaluminum initiator system

Cited by 5 publications

References 3 publications

Osmium(III) Acetylacetonate and Its Missing Polymorph: A Magnetic and Structural Investigation

Osmium(III) Acetylacetonate and Its Missing Polymorph: A Magnetic and Structural Investigation

Metal acetylacetonate–amine and metal nitrate–amine complexes as low‐emission catalysts for rigid polyurethane foam preparation

Fourier-transform Raman Spectroscopic Study of the Association Between Co(II) Ions and Acrylonitrile in Aqueous Solution

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