Tetranitratometallates of Manganese(II), Cobalt(II), Nickel(II), and Copper(II)

Straub, Darel K.; Drago, Russell S.; Donoghue, John T.

doi:10.1021/ic50004a028

Cited by 43 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As determined previously in 1964, the Co(II) ion in 3 is coordinated by eight oxygen atoms from four unsymmetrical bidentate NO 3 – groups (O4–N–O5) to form a distorted-dodecahedral configuration (Figure ). Two symmetrically related NO 3 – groups centered around N(2) atom are disordered at two positions.…”

Section: Resultssupporting

confidence: 62%

Slow Magnetic Relaxations in Cobalt(II) Tetranitrate Complexes. Studies of Magnetic Anisotropy by Inelastic Neutron Scattering and High-Frequency and High-Field EPR Spectroscopy

et al. 2016

View full text Add to dashboard Cite

Three mononuclear cobalt(II) tetranitrate complexes (A)[Co(NO)] with different countercations, PhP (1), MePhP (2), and PhAs (3), have been synthesized and studied by X-ray single-crystal diffraction, magnetic measurements, inelastic neutron scattering (INS), high-frequency and high-field EPR (HF-EPR) spectroscopy, and theoretical calculations. The X-ray diffraction studies reveal that the structure of the tetranitrate cobalt anion varies with the countercation. 1 and 2 exhibit highly irregular seven-coordinate geometries, while the central Co(II) ion of 3 is in a distorted-dodecahedral configuration. The sole magnetic transition observed in the INS spectroscopy of 1-3 corresponds to the zero-field splitting (2(D + 3E)) from 22.5(2) cm in 1 to 26.6(3) cm in 2 and 11.1(5) cm in 3. The positive sign of the D value, and hence the easy-plane magnetic anisotropy, was demonstrated for 1 by INS studies under magnetic fields and HF-EPR spectroscopy. The combined analyses of INS and HF-EPR data yield the D values as +10.90(3), +12.74(3), and +4.50(3) cm for 1-3, respectively. Frequency- and temperature-dependent alternating-current magnetic susceptibility measurements reveal the slow magnetization relaxation in 1 and 2 at an applied dc field of 600 Oe, which is a characteristic of field-induced single-molecule magnets (SMMs). The electronic structures and the origin of magnetic anisotropy of 1-3 were revealed by calculations at the CASPT2/NEVPT2 level.

show abstract

Section: Resultssupporting

confidence: 62%

Slow Magnetic Relaxations in Cobalt(II) Tetranitrate Complexes. Studies of Magnetic Anisotropy by Inelastic Neutron Scattering and High-Frequency and High-Field EPR Spectroscopy

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Moreover, in complexes containing several nitrate groups, more than one coordination mode may be present. Many papers have appeared (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21) in which attempts have been made to use the infrared spectra and Raman spectra of such complexes as a guide to the coordination mode present. It was initially proposed that the presence of an N=O stretching frequency above 1570 cm-' (10) (or above 1600 cm-(9)) indicated the presence of a bidentately coordinated nitrate group, but many exceptions to these suggestions soon became apparent (3, 14, 15).…”

Section: Introductionmentioning

confidence: 99%

Infrared Combination Frequencies in Coordination Complexes containing Nitrate Groups in various Coordination Environments. A Probe for the Metal–Nitrate Interaction

Lever¹,

Mantovani²,

Ramaswamy³

1971

Can. J. Chem.

529

113

View full text Add to dashboard Cite

show abstract

“…In EAN, the spectrum of Co(II) has a similar shape as that of [Co(H 2 O 6 )] 2+ , but it is red‐shifted for 31 nm and the intensity is much higher. The peak wavelength of 543 nm is comparable to that of Co(II) in [HO(CH 2 ) 2 mim][NO 3 ] (1‐[2‐hydroxyethyl]‐3‐methylimidazolium nitrate) 33 and [As(C 6 H 5 ) 4 ] 2 [Co(NO 3 ) 4 ] 34 in nitromethane that were found at 544 nm and 540 nm, respectively. The molar extinction coefficient (ε) of [As(C 6 H 5 ) 4 ] 2 [Co(NO 3 ) 4 ] in nitromethane and Co(II) in [HO(CH 2 ) 2 mim][NO 3 ] was about 107 L·mol −1 ·cm −1 and 102 L·mol −1 ·cm −1 , respectively, both of which are close to the value in this study, which is 103 L·mol −1 ·cm −1 .…”

Section: Resultsmentioning

confidence: 78%

Ethylammonium nitrate enhances the extraction of transition metal nitrates by tri‐n‐butyl phosphate (TBP)

Zhang

Onghena

et al. 2021

AIChE Journal

View full text Add to dashboard Cite

Several molecular polar solvents have been used as solvents of the more polar phase in the solvent extraction (SX) of metals. However, the use of hydrophilic ionic liquids (ILs) as solvents has seldomly been explored for this application. Here, the hydrophilic IL ethylammonium nitrate (EAN), has been utilized as a polar solvent in SX of transition metal nitrates by tri-n-butyl phosphate (TBP). It was found that the extraction from EAN is considerably stronger than that from a range of molecular polar solvents. The main species of Co(II) and Fe(III) in EAN are likely [Co(NO 3) 4 ] 2− and [Fe(NO 3) 4 ] − , respectively. The extracted species are likely Fe(TBP) 3 (NO 3) 3 and a mixture of Co(TBP) 2 (NO 3) 2 and Co(TBP) 3 (NO 3) 2. The addition of H 2 O or LiCl to EAN reduces the extraction because the metal cations coordinate to water molecules and chloride ions stronger than to nitrate ions. This study highlights the potential of using hydrophilic ILs to enhance SX of metals.

show abstract

Tetranitratometallates of Manganese(II), Cobalt(II), Nickel(II), and Copper(II)

Cited by 43 publications

References 0 publications

Slow Magnetic Relaxations in Cobalt(II) Tetranitrate Complexes. Studies of Magnetic Anisotropy by Inelastic Neutron Scattering and High-Frequency and High-Field EPR Spectroscopy

Slow Magnetic Relaxations in Cobalt(II) Tetranitrate Complexes. Studies of Magnetic Anisotropy by Inelastic Neutron Scattering and High-Frequency and High-Field EPR Spectroscopy

Infrared Combination Frequencies in Coordination Complexes containing Nitrate Groups in various Coordination Environments. A Probe for the Metal–Nitrate Interaction

Ethylammonium nitrate enhances the extraction of transition metal nitrates by tri‐n‐butyl phosphate (TBP)

Contact Info

Product

Resources

About