The Reaction of Nickel with Dioximes

Bambenek, Mark A.; Pflaum, Ronald T.

doi:10.1021/ic50006a011

Cited by 19 publications

(9 citation statements)

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“…This suggestion correlates rather well with limited crystallographic evidence.43 Twist angles are available3 for eight compounds and we see in Fig. 13 that the more highly hindered species exhibit larger AEs values.…”

Section: Discussionsupporting

confidence: 85%

Study of Steric Effects by Electron Spin Resonance Spectroscopy and Polarography. Substituted Nitrobenzenes and Nitroanilines

Geske¹,

Ragle²,

Bambenek³

et al. 1964

J. Am. Chem. Soc.

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136

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Section: Discussionsupporting

confidence: 85%

Study of Steric Effects by Electron Spin Resonance Spectroscopy and Polarography. Substituted Nitrobenzenes and Nitroanilines

Geske¹,

Ragle²,

Bambenek³

et al. 1964

J. Am. Chem. Soc.

Self Cite

136

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“…A check on the linearity of the weighting scheme as a function of various parameters indicated that the 50 highest intensity reflections were not sufficiently downweighted and that the weights were nonlinear as a function of (sin )/ . The final parameters and their standard devia- 0.01213 (7) 0.01213 (7) 0.00046 (1) (8) 0.01262 (54) 0.01205 (55) 0.00056 (3) (7) 0.01152 (44) 0.01285 (46) 0.00068 (3) (8) 0.01457 (51) 0.01597 (51) 0.00061 (3) (12) 0.01405 (72) 0.02011 (86) 0.00052 (4) (8) 0.01438 (49) 0.01234 (46) 0.00070 (3) (6) 0.01332 (39) 0.01428 (40) 0.00066 (3) (5) 0.01974 (41) 0.01871 (39) 0.00082 (2) (9) 0.02726 (75) 0.01777 (60) 0.00107 (4) 0.00013 (10) 0.00085 (46) -0.00023 (10) 0.00062 (12) -0.00055 (70) 0 0 0.00077 (44) -0.00037 (10) -0.00002 (10) 0.00026 (35) 0.00004 (8) -0.00052 (8) 0.00338 (34) 0.00018 (8) -0.00122 (8) 0.00726 (60) -0.00058 (14) -0.00012 (12) 2/313 hi + 2.ß13 )]. tions as calculated using this p/c weighting scheme are listed in Tables I and II.…”

Section: T H Imentioning

confidence: 99%

Stabilization of the higher oxidation states of nickel. Molecular structure of bis(2,6-diacetylpyridine dioximato)nickel(IV)

Sproul¹,

Stucky²

1973

Inorg. Chem.

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The nickel(IV) complex, bis(2,6-diacetylpyridine dioximato)nickel(IV), Ni(C9N302H9), has been examined by single-crystal X-ray structural techniques. The crystallographic data are: Laue symmetry 4/m; space group, I4Ja;a = b = 7.745 (3) A, c = 30.510 (16) A; dm = 1.59 (2) g/cm3; dx = 1.600 g/cm3 for four monomeric molecules in the unit cell. The 8371 reflections were measured on an automated Picker four-circle diffractometer and gave 702 unique observations for the structural analysis. Full-matrix least-squares analysis including hydrogen atoms gave final discrepancy factors of R = 0.028 and Rw = 0.025, S = 0.93. The crystallographic and molecular symmetry of the molecule is 4 (SJ with the nickel atom coordinated to two 2,6-diacetylpyridine dioximato ligands via the six nitrogen atoms of these ligands. A comparison of these nickelnitrogen distances with those found in nickel(II) complexes suggests a shortening of 0.17 A in the Ni(IV)-N bond. This average difference of 0.17 A for t2g6 and t2g6eg2 with a change in formal oxidation number of 2 can be compared with the 0.18-A difference reported earlier in the t2gseg2 Co(NH3)62+ and t2g6 Co(NH3)63+ complexes with a change in formal oxidation number of 1.

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“…Here, electron pairs are donated to the Ni 2+ ions by nitrogen atoms of the dimethylglyoxime molecule and not the oxygen atoms as commonly expected. In addition, one proton is lost from a oxime group on each of the dimethylglyoxime molecules [ 48 ]. The addition of OH − anions facilitates metal-chelate complex formation [ 49 ] which occurs quantitatively in solutions buffered between pH’s of 5 and 9.…”

Section: Resultsmentioning

confidence: 99%

Complexation-Based Detection of Nickel(II) at a Graphene-Chelate Probe in the Presence of Cobalt and Zinc by Adsorptive Stripping Voltammetry

Pokpas

Jahed

Baker

et al. 2017

Sensors

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The adsorptive stripping voltammetric detection of nickel and cobalt in water samples at metal film electrodes has been extensively studied. In this work, a novel, environmentally friendly, metal-free electrochemical probe was constructed for the ultra-trace determination of Ni2+ in water samples by Adsorptive Cathodic Stripping Voltammetry (AdCSV). The electrochemical platform is based on the adsorptive accumulation of Ni2+ ions directly onto a glassy carbon electrode (GCE) modified with dimethylglyoxime (DMG) as chelating agent and a Nafion-graphene (NGr) nanocomposite to enhance electrode sensitivity. The nafion-graphene dimethylglyoxime modified glassy carbon electrode (NGr-DMG-GCE) shows superior detection capabilities as a result of the improved surface-area-to-volume ratio and enhanced electron transfer kinetics following the incorporation of single layer graphene, while limiting the toxic effects of the sensor by removal of the more common mercury, bismuth and lead films. Furthermore, for the first time the NGr-DMG-GCE, in the presence of common interfering metal ions of Co2+ and Zn2+ demonstrates good selectivity and preferential binding towards the detection of Ni2+ in water samples. Structural and morphological characterisation of the synthesised single layer graphene sheets was conducted by Raman spectrometry, HRTEM and HRSEM analysis. The instrumental parameters associated with the electrochemical response, including accumulation potential and accumulation time were investigated and optimised in addition to the influence of DMG and graphene concentrations. The NGr-DMG-GCE demonstrated well resolved, reproducible peaks, with RSD (%) below 5% and a detection limit of 1.5 µg L−1 for Ni2+ reduction at an accumulation time of 120 s. The prepared electrochemical sensor exhibited good detection and quantitation towards Ni2+ detection in tap water samples, well below 0.1 mg L−1 set by the WHO and EPA standards. This is comparable to the South African drinking water guidelines of 0.15 mg L−1.

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The Reaction of Nickel with Dioximes

Cited by 19 publications

References 0 publications

Study of Steric Effects by Electron Spin Resonance Spectroscopy and Polarography. Substituted Nitrobenzenes and Nitroanilines

Study of Steric Effects by Electron Spin Resonance Spectroscopy and Polarography. Substituted Nitrobenzenes and Nitroanilines

Stabilization of the higher oxidation states of nickel. Molecular structure of bis(2,6-diacetylpyridine dioximato)nickel(IV)

Complexation-Based Detection of Nickel(II) at a Graphene-Chelate Probe in the Presence of Cobalt and Zinc by Adsorptive Stripping Voltammetry

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