The solution chemistry of ethylmethylglyoxime

Egneus, Birgitta

doi:10.1016/s0003-2670(01)85496-9

Cited by 11 publications

(4 citation statements)

References 27 publications

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“…While the α form is thermodynamically more stable, the β form is kinetically favored, and heating will not convert it to the α form due to the improbability of eclipsed molecules rotating in the solid state to become staggered. On the basis of our preparation, the X-ray diffraction pattern of the film, and the UV spectrum, we conclude that it is β-Ni(meg) 2 with which we have dealt. Its volatility is in the range we would expect from the position of its visible band and the closer M−M distance, and since the energy barrier to the α-phase cannot be surmounted by heating, it sublimes as the β modification.…”

Section: Resultsmentioning

confidence: 85%

“…Ni(meg) 2 reportedly has α and β crystal forms, , the former monoclinic (eclipsed packing), with M−M = 4.75 Å, and the latter orthorhombic (staggered packing), with M−M = 3.44 Å. , The preparation determines which modification is obtained, with fast precipitation from reactants favoring the orange β phase and slow recrystallization from chloroform favoring the red α phase. While the α form is thermodynamically more stable, the β form is kinetically favored, and heating will not convert it to the α form due to the improbability of eclipsed molecules rotating in the solid state to become staggered.…”

Section: Resultsmentioning

confidence: 99%

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Variations on Nickel Complexes of the vic-Dioximes: An Understanding of Factors Affecting Volatility toward Improved Precursors for Metal−Organic Chemical Vapor Deposition of Nickel

et al. 1998

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The vic-dioxime complexes bis(2,3-butanedionedioximato)nickel(II), Ni(dmg) 2 ; bis(3,4hexanedionedioximato)nickel(II), Ni(deg) 2 ; bis(4,5-octanedionedioximato)nickel(II), Ni(dpg) 2 ; bis(ethanedialdioximato)nickel(II), Ni(g) 2 ; bis(1,2-diphenylethanedionedioximato)nickel(II), Ni(dbg) 2 ; bis(1,2-cyclohexanedionedioximato)nickel(II), Ni(nox) 2 ; and bis(2,3-pentanedionedioximato)nickel(II), Ni(meg) 2 , were prepared. Their volatilities were compared under ambient and reduced pressure using thermogravimetry. Ni(deg) 2 and Ni(dpg) 2 were the most volatile, and the variation in volatility of each complex was explained on the basis of ligand effects, crystal packing, and nickel-nickel distances using solid-state electronic spectra. The crystal structure of Ni(dpg) 2 was determined for the first time: monoclinic crystal system, C2/c space group. The complex packs in pairs related by the c-glide plane symmetry. Short intrapair distances of 3.312(2) Å are observed between Ni and N with short and long Ni-Ni distances of 3.2044(5) and 5.7964(5) Å, respectively. Metal-organic chemical vapor deposition (MOCVD) experiments were conducted using Ni(deg) 2 as precursor in a vertical cold-walled reactor. The precursor transport and film growth behavior, morphology, and composition have been examined. Pure films could be grown between 350 and 400 °C in helium. Growth rates were greater with additional hydrogen, but the films were heavily contaminated with carbon. The difference in growth rates and film morphology for the different reactor conditions was investigated.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Variations on Nickel Complexes of the vic-Dioximes: An Understanding of Factors Affecting Volatility toward Improved Precursors for Metal−Organic Chemical Vapor Deposition of Nickel

et al. 1998

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“…To the best of our knowledge, RNC crystal structures ( 7 )–( 8 ) are only the third example of stacked Ni(II) complexes that form infinite parallel metal ion columns without bridging atoms between metal centres. The first two are the structures based on vic -dioximes [ 20 ], predominantly dimethyl [ 21 , 22 , 23 , 24 , 25 ] and diphenyl [ 26 , 27 , 28 ] glyoximes, and the 3-(hydroxyamino)-3-methyl-2-butanone oximato 2− ligand [ 29 ]. All such structures are characterised by parallel Ni ion columns with a single metal–metal distance in the range 3.183 Å to 3.254 Å for Ni( dmg ) 2 (dimethylglyoxime), according to different authors, and six nearest-neighbour columns around the central stack.…”

Section: Discussionmentioning

confidence: 99%

Old Acquaintances and Novel Complex Structures for the Ni(II) and Cu(II) Complexes of bis-Chelate Oxime–Amide Ligands

Bazzicalupi,

Grimmer,

Nikolayenko

2024

Molecules

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In the process of systematically studying the methylhydroxyiminoethaneamide bis-chelate ligands with polymethylene spacers of different lengths, L1–L3, and their transition metal complexes, a number of new Ni(II) and Cu(II) species have been isolated, and their molecular and crystal structures were determined using single-crystal X-ray diffraction. In all of these compounds, the divalent metal is coordinated by the ligand donor atoms in a square-planar arrangement. In addition, a serendipitously discovered new type of neutral Ni(II) complex, where the propane spacer of ligand L2 underwent oxidation to the propene spacer, and one of the amide groups was oxidised to the ketoimine, is also reported. The resulting ligand L2′ affords the formation of neutral planar Ni(II) complexes, which are assembled in the solid state on top of each other, and yield two polymorphic structures. In both structures, the resulting infinite, exclusively parallel metal ion columns in ligand insulation may serve as precursor materials for sub-nano-conducting connectors. Overall, this paper reports the synthesis and characterisation of seven new anionic, cationic, and neutral Ni(II) and Cu(II) complexes, their crystal structures, as well as experimental and computed UV–Vis absorption spectra for two structurally similar Ni(II) complexes, yellow and red.

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“…lg "K,,(NiH,L2) nnd lg 'KI1 (NiH,L,) sind also kleincr alp lg 'XIl3, die Katioii~n [Xi( Et,K'HDH)(EtNUH)]+ und EtJYDH-+ H+ -2 ,,Et,NI)H," "K, 1 (1) ,,Et2SDH2" 1 HT + Et,NHDH,+ (2) 1! Et,NHUH, + N9+ + [Ni[Et,NHDH),]?+ + 2 H+ (5) [Ki(Et2NHDH)J2+ stkrkcrc Stiiurm als Et,NHDH,+ ! Xine Diskussioii der Ursaclicn sol1 ~m p r n dcs lioinplexen Chamkters von CK,, untc.rblcibcn.…”

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Bildung und Reaktionen Von Nickel(II)‐Komplexen mit aminsubstituierten 1,2‐Dioximen

Dorn

Linke

Uhlig

1980

Zeitschrift anorg allge chemie

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Nickel(II) bildet in Lösung mit aminsubstituierten 1,2‐Dioximen R2NDH2 Neutralkomplexe Ni(R2NDH)2 und Kationen [Ni(R2NHDH)2]2+ bzw. [Ni(R2NDH)(R2NHDH)]+. Nur die Kationen [Ni(R2NHDH)2]2+ ergeben mit Anionen wie ClO4− und BPH4 gut kristallisierende Salze. Die Reaktionen der Neutralkomplexe Ni(R2NDH)2 mit BF3 bzw. BEt3 führt zu den Makrocyclen [Ni(R2NHDBF2)2] (BF4)2 bzw. Ni(R2NDBEt2)2. Die Isolierung fester paramagnetischer Pyridinaddukte gelang im Fall der komplexen Salze [Ni(R2NHDH)2](ClO4)2. Auf Grund der Farbe und der chemischen Reaktionen werden die neuen Komplexe in zwei Gruppen eingeteilt, die sich in der Stapelfolge der planaren Einzelmoleküle Unterscheiden. Es werden die Zusammenhänge zwischen der Struktur der Einzelmoleküle und der Art der Stapelung im Kristall diskutiert. Die Isomeren des Ni(Me2NDH)2 (rot und gelb) gehören unterschiedlichen Gruppen an.

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The solution chemistry of ethylmethylglyoxime

Cited by 11 publications

References 27 publications

Variations on Nickel Complexes of the vic-Dioximes: An Understanding of Factors Affecting Volatility toward Improved Precursors for Metal−Organic Chemical Vapor Deposition of Nickel

Variations on Nickel Complexes of the vic-Dioximes: An Understanding of Factors Affecting Volatility toward Improved Precursors for Metal−Organic Chemical Vapor Deposition of Nickel

Old Acquaintances and Novel Complex Structures for the Ni(II) and Cu(II) Complexes of bis-Chelate Oxime–Amide Ligands

Bildung und Reaktionen Von Nickel(II)‐Komplexen mit aminsubstituierten 1,2‐Dioximen

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