Preparation, structural characterization and properties of malonamato(−1) complexes

Dynamic relaxometry: application to iron uptake by ferritin

“…The rhombicity value, g 1 ± g 2 = 6.14, is fairly large and reflects a significant asymmetry in the equatorial plane of Co(II) [29]. These g-values are in the range of those observed in similar high-spin octahedral Co(II) complexes, such as trans-[Co II (malonamato) 2 (H 2 O) 2 ] [30]. Characteristic of the EPR signal of 1 is the presence of a broad feature slightly over 200 mT, which grows as the temperature of the spectrum decreases, resolves below 35 K, and reaches maximum intensity at 19 K. The line shapes are mostly dominated by the unresolved hyperfine interactions and by a distribution of E/D, where D and E describe the axial and rhombic zero-field splitting (ZFS) constants, respectively.…”

Dynamic relaxometry: application to iron uptake by ferritin

“…The rhombicity value, g 1 ± g 2 = 6.14, is fairly large and reflects a significant asymmetry in the equatorial plane of Co(II) [29]. These g-values are in the range of those observed in similar high-spin octahedral Co(II) complexes, such as trans-[Co II (malonamato) 2 (H 2 O) 2 ] [30]. Characteristic of the EPR signal of 1 is the presence of a broad feature slightly over 200 mT, which grows as the temperature of the spectrum decreases, resolves below 35 K, and reaches maximum intensity at 19 K. The line shapes are mostly dominated by the unresolved hyperfine interactions and by a distribution of E/D, where D and E describe the axial and rhombic zero-field splitting (ZFS) constants, respectively.…”

The succinamate(−1) ligand in 4f-metal chemistry: First example of amide coordination in the double-chain 1D coordination polymer catena-aquatris(succinamato(−1))erbium(III)

“…Owing to the presence of two different types of amide groups in 1 and 2, two m(C@O) and two [30]. The IR spectra of 1 and 2 are almost identical, suggesting that these complexes have similar structures.…”

First use of the succinamate(−1) ligand in 3d-metal chemistry: dinuclear copper(II) complexes with the rare [Cu2(η1:μ2-O2CR)2(η1:η1:μ2-O2CR)]+, [Cu2(η1:η1:μ2-O2CR)2]2+ and [Cu2(μ-OH)(μ-OH2)(η1:η1:μ2-O2CR)]2+ cores, and a novel one-dimensional polymerization of two different dimers (R=CH2CH2CONH2)

“…Complexes 1a, 1b and 2-4 were characterized by vibrational spectroscopy [16]. IR assignments of some diagnostic bands (Table 1) have been given in comparison with the data obtained for lithium succinate (assumed to contain a ÔfreeÕ carboxylate group) [16], oxamato()1) ( À OOC-CONH 2 ) [17] and malonamato()1) ( À OOC-CH 2 -CONH 2 ) [18] complexes; they have also been assisted by NH/ND and OH/OD isotopic substitutions [16]. The typical bands of the neutral amide group (m as (NH 2 ), m s (NH 2 ), m(C@O), m(CN)) are situated at approximately the same frequencies in the spectra of the complexes compared to those in the spectrum of LiLH, confirming the non-participation of the amide group in coordination.…”

Dynamic relaxometry: application to iron uptake by ferritin

“…The rhombicity value, g 1 ± g 2 = 6.14, is fairly large and reflects a significant asymmetry in the equatorial plane of Co(II) [29]. These g-values are in the range of those observed in similar high-spin octahedral Co(II) complexes, such as trans-[Co II (malonamato) 2 (H 2 O) 2 ] [30]. Characteristic of the EPR signal of 1 is the presence of a broad feature slightly over 200 mT, which grows as the temperature of the spectrum decreases, resolves below 35 K, and reaches maximum intensity at 19 K. The line shapes are mostly dominated by the unresolved hyperfine interactions and by a distribution of E/D, where D and E describe the axial and rhombic zero-field splitting (ZFS) constants, respectively.…”

The succinamate(−1) ligand in 4f-metal chemistry: First example of amide coordination in the double-chain 1D coordination polymer catena-aquatris(succinamato(−1))erbium(III)

“…Owing to the presence of two different types of amide groups in 1 and 2, two m(C@O) and two [30]. The IR spectra of 1 and 2 are almost identical, suggesting that these complexes have similar structures.…”

First use of the succinamate(−1) ligand in 3d-metal chemistry: dinuclear copper(II) complexes with the rare [Cu2(η1:μ2-O2CR)2(η1:η1:μ2-O2CR)]+, [Cu2(η1:η1:μ2-O2CR)2]2+ and [Cu2(μ-OH)(μ-OH2)(η1:η1:μ2-O2CR)]2+ cores, and a novel one-dimensional polymerization of two different dimers (R=CH2CH2CONH2)

“…Complexes 1a, 1b and 2-4 were characterized by vibrational spectroscopy [16]. IR assignments of some diagnostic bands (Table 1) have been given in comparison with the data obtained for lithium succinate (assumed to contain a ÔfreeÕ carboxylate group) [16], oxamato()1) ( À OOC-CONH 2 ) [17] and malonamato()1) ( À OOC-CH 2 -CONH 2 ) [18] complexes; they have also been assisted by NH/ND and OH/OD isotopic substitutions [16]. The typical bands of the neutral amide group (m as (NH 2 ), m s (NH 2 ), m(C@O), m(CN)) are situated at approximately the same frequencies in the spectra of the complexes compared to those in the spectrum of LiLH, confirming the non-participation of the amide group in coordination.…”

Dynamic relaxometry: application to iron uptake by ferritin

“…The rhombicity value, g 1 ± g 2 = 6.14, is fairly large and reflects a significant asymmetry in the equatorial plane of Co(II) [29]. These g-values are in the range of those observed in similar high-spin octahedral Co(II) complexes, such as trans-[Co II (malonamato) 2 (H 2 O) 2 ] [30]. Characteristic of the EPR signal of 1 is the presence of a broad feature slightly over 200 mT, which grows as the temperature of the spectrum decreases, resolves below 35 K, and reaches maximum intensity at 19 K. The line shapes are mostly dominated by the unresolved hyperfine interactions and by a distribution of E/D, where D and E describe the axial and rhombic zero-field splitting (ZFS) constants, respectively.…”

The succinamate(−1) ligand in 4f-metal chemistry: First example of amide coordination in the double-chain 1D coordination polymer catena-aquatris(succinamato(−1))erbium(III)

“…Owing to the presence of two different types of amide groups in 1 and 2, two m(C@O) and two [30]. The IR spectra of 1 and 2 are almost identical, suggesting that these complexes have similar structures.…”

First use of the succinamate(−1) ligand in 3d-metal chemistry: dinuclear copper(II) complexes with the rare [Cu2(η1:μ2-O2CR)2(η1:η1:μ2-O2CR)]+, [Cu2(η1:η1:μ2-O2CR)2]2+ and [Cu2(μ-OH)(μ-OH2)(η1:η1:μ2-O2CR)]2+ cores, and a novel one-dimensional polymerization of two different dimers (R=CH2CH2CONH2)

“…Complexes 1a, 1b and 2-4 were characterized by vibrational spectroscopy [16]. IR assignments of some diagnostic bands (Table 1) have been given in comparison with the data obtained for lithium succinate (assumed to contain a ÔfreeÕ carboxylate group) [16], oxamato()1) ( À OOC-CONH 2 ) [17] and malonamato()1) ( À OOC-CH 2 -CONH 2 ) [18] complexes; they have also been assisted by NH/ND and OH/OD isotopic substitutions [16]. The typical bands of the neutral amide group (m as (NH 2 ), m s (NH 2 ), m(C@O), m(CN)) are situated at approximately the same frequencies in the spectra of the complexes compared to those in the spectrum of LiLH, confirming the non-participation of the amide group in coordination.…”