EPR Spectroscopy Investigation of Cu 2+ Ions Adsorbed in Tannin-Formaldehyde Resins of Mimosa ( Acacia mearnsii ) Bark Extracts
The chemical environment of Cu 2+ ions adsorbed in tannin-formaldehyde resins of Acacia mearnsii bark extracts, prepared from polybutene, is investigated by EPR spectroscopy at 300 K. The spectrum is simulated considering two isolated axial Cu(II) species (Species 1: A ∥ = 16.50 ( 5 ) mT , A ⊥ = 1...
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| Veröffentlicht in: | Journal of spectroscopy (Hindawi) 2015, Vol.2015, p.1-5 |
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| container_title | Journal of spectroscopy (Hindawi) |
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| creator | Herbst, Marcelo H. Vugman, Ney V. |
| description | The chemical environment of Cu
2+
ions adsorbed in tannin-formaldehyde resins of
Acacia mearnsii
bark extracts, prepared from polybutene, is investigated by EPR spectroscopy at 300 K. The spectrum is simulated considering two isolated axial Cu(II) species (Species 1:
A
∥
=
16.50
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.28
(
1
)
, and
g
⊥
=
2.08
(
1
)
; Species 2:
A
∥
=
15.00
(
5
)
mT
,
A
⊥
=
1.50
(
10
)
mT
,
g
∥
=
2.32
(
1
)
, and
g
⊥
=
2.05
(
2
)
), superposed to a broad line (
g
iso
=
2.14
(
1
)
; linewidth = 30.0(5) mT) assigned to Cu(II) aggregates. Measurements at 77 K did not improve spectral resolution. Heating at 413 K changes the hyperfine parameters of Species 2 (
A
∥
=
14.20
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.33
(
1
)
, and
g
⊥
=
2.07
(
2
)
) and slightly modifies the parameters of the broad line (
g
iso
=
2.11
(
2
)
; linewidth = 40.00(50) mT) but does not change Species 1, assigned to Cu(II) species immobilized into resin pores in cathecolate-type coordination sites. Species 2 is assigned to Cu(II) species immobilized at the outer resin surface. Upon extended heating, a reversible formation of semiquinone-type paramagnetic radicals (
g
iso
=
2.0037
(
1
)
) is observed, assigned to the partial collapse of the resin polymeric network. |
| doi_str_mv | 10.1155/2015/978270 |
| format | Article |
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2+
ions adsorbed in tannin-formaldehyde resins of
Acacia mearnsii
bark extracts, prepared from polybutene, is investigated by EPR spectroscopy at 300 K. The spectrum is simulated considering two isolated axial Cu(II) species (Species 1:
A
∥
=
16.50
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.28
(
1
)
, and
g
⊥
=
2.08
(
1
)
; Species 2:
A
∥
=
15.00
(
5
)
mT
,
A
⊥
=
1.50
(
10
)
mT
,
g
∥
=
2.32
(
1
)
, and
g
⊥
=
2.05
(
2
)
), superposed to a broad line (
g
iso
=
2.14
(
1
)
; linewidth = 30.0(5) mT) assigned to Cu(II) aggregates. Measurements at 77 K did not improve spectral resolution. Heating at 413 K changes the hyperfine parameters of Species 2 (
A
∥
=
14.20
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.33
(
1
)
, and
g
⊥
=
2.07
(
2
)
) and slightly modifies the parameters of the broad line (
g
iso
=
2.11
(
2
)
; linewidth = 40.00(50) mT) but does not change Species 1, assigned to Cu(II) species immobilized into resin pores in cathecolate-type coordination sites. Species 2 is assigned to Cu(II) species immobilized at the outer resin surface. Upon extended heating, a reversible formation of semiquinone-type paramagnetic radicals (
g
iso
=
2.0037
(
1
)
) is observed, assigned to the partial collapse of the resin polymeric network.</description><identifier>ISSN: 2314-4920</identifier><identifier>EISSN: 2314-4939</identifier><identifier>DOI: 10.1155/2015/978270</identifier><language>eng</language><ispartof>Journal of spectroscopy (Hindawi), 2015, Vol.2015, p.1-5</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-crossref_primary_10_1155_2015_9782703</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,861,4010,27904,27905,27906</link.rule.ids></links><search><creatorcontrib>Herbst, Marcelo H.</creatorcontrib><creatorcontrib>Vugman, Ney V.</creatorcontrib><title>EPR Spectroscopy Investigation of Cu 2+ Ions Adsorbed in Tannin-Formaldehyde Resins of Mimosa ( Acacia mearnsii ) Bark Extracts</title><title>Journal of spectroscopy (Hindawi)</title><description>The chemical environment of Cu
2+
ions adsorbed in tannin-formaldehyde resins of
Acacia mearnsii
bark extracts, prepared from polybutene, is investigated by EPR spectroscopy at 300 K. The spectrum is simulated considering two isolated axial Cu(II) species (Species 1:
A
∥
=
16.50
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.28
(
1
)
, and
g
⊥
=
2.08
(
1
)
; Species 2:
A
∥
=
15.00
(
5
)
mT
,
A
⊥
=
1.50
(
10
)
mT
,
g
∥
=
2.32
(
1
)
, and
g
⊥
=
2.05
(
2
)
), superposed to a broad line (
g
iso
=
2.14
(
1
)
; linewidth = 30.0(5) mT) assigned to Cu(II) aggregates. Measurements at 77 K did not improve spectral resolution. Heating at 413 K changes the hyperfine parameters of Species 2 (
A
∥
=
14.20
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.33
(
1
)
, and
g
⊥
=
2.07
(
2
)
) and slightly modifies the parameters of the broad line (
g
iso
=
2.11
(
2
)
; linewidth = 40.00(50) mT) but does not change Species 1, assigned to Cu(II) species immobilized into resin pores in cathecolate-type coordination sites. Species 2 is assigned to Cu(II) species immobilized at the outer resin surface. Upon extended heating, a reversible formation of semiquinone-type paramagnetic radicals (
g
iso
=
2.0037
(
1
)
) is observed, assigned to the partial collapse of the resin polymeric network.</description><issn>2314-4920</issn><issn>2314-4939</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqVj8FKw0AURQdRsNiu_IG3VErsTDJDzLKWFLsQSu0-vE4m-rCZCfOimJW_bori3tW9i3PhHiGulbxTyphFKpVZFPl9msszMUkzpRNdZMX5X0_lpZgx00FqnWuTGzkRX-V2B8-ds30MbEM3wMZ_OO7pBXsKHkIDq3dI57AJnmFZc4gHVwN52KP35JN1iC0ea_c61A52jmnExtETtYERbmBp0RJC6zB6JoJbeMD4BuVnH9H2PBUXDR7ZzX7zSszX5X71mNjxD0fXVF2kFuNQKVmdNKuTZvWjmf2P_gbtVVev</recordid><startdate>2015</startdate><enddate>2015</enddate><creator>Herbst, Marcelo H.</creator><creator>Vugman, Ney V.</creator><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>2015</creationdate><title>EPR Spectroscopy Investigation of Cu 2+ Ions Adsorbed in Tannin-Formaldehyde Resins of Mimosa ( Acacia mearnsii ) Bark Extracts</title><author>Herbst, Marcelo H. ; Vugman, Ney V.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-crossref_primary_10_1155_2015_9782703</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Herbst, Marcelo H.</creatorcontrib><creatorcontrib>Vugman, Ney V.</creatorcontrib><collection>CrossRef</collection><jtitle>Journal of spectroscopy (Hindawi)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Herbst, Marcelo H.</au><au>Vugman, Ney V.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>EPR Spectroscopy Investigation of Cu 2+ Ions Adsorbed in Tannin-Formaldehyde Resins of Mimosa ( Acacia mearnsii ) Bark Extracts</atitle><jtitle>Journal of spectroscopy (Hindawi)</jtitle><date>2015</date><risdate>2015</risdate><volume>2015</volume><spage>1</spage><epage>5</epage><pages>1-5</pages><issn>2314-4920</issn><eissn>2314-4939</eissn><abstract>The chemical environment of Cu
2+
ions adsorbed in tannin-formaldehyde resins of
Acacia mearnsii
bark extracts, prepared from polybutene, is investigated by EPR spectroscopy at 300 K. The spectrum is simulated considering two isolated axial Cu(II) species (Species 1:
A
∥
=
16.50
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.28
(
1
)
, and
g
⊥
=
2.08
(
1
)
; Species 2:
A
∥
=
15.00
(
5
)
mT
,
A
⊥
=
1.50
(
10
)
mT
,
g
∥
=
2.32
(
1
)
, and
g
⊥
=
2.05
(
2
)
), superposed to a broad line (
g
iso
=
2.14
(
1
)
; linewidth = 30.0(5) mT) assigned to Cu(II) aggregates. Measurements at 77 K did not improve spectral resolution. Heating at 413 K changes the hyperfine parameters of Species 2 (
A
∥
=
14.20
(
5
)
mT
,
A
⊥
=
1.20
(
10
)
mT
,
g
∥
=
2.33
(
1
)
, and
g
⊥
=
2.07
(
2
)
) and slightly modifies the parameters of the broad line (
g
iso
=
2.11
(
2
)
; linewidth = 40.00(50) mT) but does not change Species 1, assigned to Cu(II) species immobilized into resin pores in cathecolate-type coordination sites. Species 2 is assigned to Cu(II) species immobilized at the outer resin surface. Upon extended heating, a reversible formation of semiquinone-type paramagnetic radicals (
g
iso
=
2.0037
(
1
)
) is observed, assigned to the partial collapse of the resin polymeric network.</abstract><doi>10.1155/2015/978270</doi></addata></record> |
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| language | eng |
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| source | DOAJ Directory of Open Access Journals; Wiley Online Library Open Access; Alma/SFX Local Collection |
| title | EPR Spectroscopy Investigation of Cu 2+ Ions Adsorbed in Tannin-Formaldehyde Resins of Mimosa ( Acacia mearnsii ) Bark Extracts |
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