Metal Isotope Effect on Metal-Ligand Vibrations. IX. Far Infrared Spectra of Octahedral Nickel Halide Complexes of Pyridine and γ-Picoline

Saito, Yutaka; Schläpfer, C. W.; Cordes, Marcia; Nakamoto, Kazuo

doi:10.1366/000370273774333614

Cited by 18 publications

(3 citation statements)

References 10 publications

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“…The band observed at 1612 cm -1 assigned to υ(C=N) vibration of azomethine group is shifted to the lower wave number in all metal complexes due to the coordination of the nitrogen atom of the azomethine group [9]. Some other new bands appearing in the region of (532-412) cm -1 in the complexes spectra, which are not present in the spectrum of the ligand may be attributed to the υ(M-N) and υ(M-O) bands [10,11]. Figs.(3,4).…”

Section: Resultsmentioning

confidence: 88%

Synthesis, Characterization and Study of Antibacterial Activity of a New Schiff Base Ligand and Its Complexes with Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) Metal Ions

Journal¹

2016

Baghdad Sci.J

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Some coordination complexes of Co(??), Ni(??), Cu(??), Cd(??) and Hg(??) are reacted in ethanol with Schiff base ligand derived from of 2,4,6- trihydroxybenzophenone and 3-aminophenol using microwave irradiation and then reacted with metal salts in ethanol as a solvent in 1:2 ratio (metal: ligand). The ligand [H4L] is characterized by FTIR, UV-Vis, C.H.N, 1H-NMR,13C-NMR, and mass spectra. The metal complexes are characterized by atomic absorption, infrared spectra, electronic spectra, molar conductance, (C.H.N for Ni(??) complex) and magnetic moment measurements. These measurements indicate that the ligand coordinates with metal (??) ion in a tridentate manner through the nitrogen and oxygen atoms of the ligand, octahedral structures are suggested for these complexes. Antibacterial activity of the ligand [H4L] and its complexes are studied against (gram positive) and (gram negative) bacteria [Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus]. The proposed structure of the complexes using the program, Chem office (2006) and the general formula has been given for the prepared ligand complexes K2[M(H2L)2].

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Section: Resultsmentioning

confidence: 88%

Synthesis, Characterization and Study of Antibacterial Activity of a New Schiff Base Ligand and Its Complexes with Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) Metal Ions

Journal¹

2016

Baghdad Sci.J

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“…Pyridine has been one of the most common molecular substrates used in SERS studies since its discovery in 1974. − Herein, we consider the analogous effect of excitation of the heme in a plane orthogonal to the molecule vibrations of pyridine bound axially to the heme iron. In heme proteins, an axial amino acid residue acts as the ligand to the heme iron and is the sole covalent connection between the heme and protein in globins and many enzymes.…”

Section: Introductionmentioning

confidence: 99%

A Resonance Raman Enhancement Mechanism for Axial Vibrational Modes in the Pyridine Adduct of Myoglobin Proximal Cavity Mutant (H93G)

et al. 2012

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The proximal cavity mutant of myoglobin consists of a mutation of the proximal histidine to glycine (H93G), which permits exogenous ligands to bind to the heme iron. A non-native pyridine ligand can ligate to the heme to yield a five-coordinate adduct, H93G(Pyr), that cannot be formed freely in solution since the six-coordinate bis-pyridine adduct is more stable than the five-coordinate adduct. We have used resonance Raman spectroscopy in the Soret band region of the heme to study the enhancement of axial vibrations of bound pyridine in the H93G(Pyr) adduct. The observation that the pyridine ring breathing mode (ν(1)) and the symmetric ring stretching (ν(3)) modes are enhanced under these conditions is explained by a computational approach that shows that coupling of the π-system of the heme with the p-orbitals of the pyridine is analogous to π-backbonding in diatomic ligand adducts of heme proteins. The result has the broader significance that it suggests that the resonance enhancement of pyridine modes could be an important aspect of Raman scattering of pyridine on conducting surfaces such as those studied in surface enhanced Raman scattering experiments.

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“…Hierzu sehen wir uns veranlaût, weil die bereits 1958 publizierte Struktur [4] offensichtlich zu einem fehlerhaften Ergebnis gefu È hrt hat. Wir teilen diese Daten mit, weil sie nicht vo È llig mit den von anderer Seite publizierten IR-Spektrum [6] u È bereinstimmen. Sie ist damit deutlich la È ngerwellig als in Phosphan-Komplexen des NiBr 2 mit Koordinationszahl vier [5].…”

Section: Introductionunclassified

Die Kristallstrukturen vontrans-[NiBr2(Pyridin)4] und [Ni(HNPEt3)4]I2

Gröb¹,

Neumüller²,

Harms³

et al. 2001

Z. anorg. allg. Chem.

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Professor Eberhard Hoyer zum 70. Geburtstag gewidmet Inhaltsu È bersicht. Tu È rkisfarbene Einkristalle von trans-[NiBr 2 -(Pyridin) 4 ] wurden bei der Reaktion von einem Ûberschuû Pyridins mit Nickel(II)-bromid/Diacetonalkohol gewonnen. Nach der Kristallstrukturbestimmung ist das Nickel-Atom oktaedrisch von zwei Brom-Atomen in trans-Position und den Stickstoff-Atomen der Pyridin-Moleku È le umgeben. Raumgruppe Pna2 1 , Z = 4, Gitterparameter bei 20°C: a = 1592,9(2), b = 943,8(1), c = 1413,0(2) pm, R 1 = 0.0492. Der Phosphanimin-Komplex [Ni(HNPEt 3 ) 4 ]I 2 wurde in Form von dunkelblauen Einkristallen aus der Umsetzung von NiI 2 /H 2 O mit einem Ûberschuû von Me 3 SiNPEt 3 und nachfolgender Kristallisation aus Acetonitril erhalten.Hier ergab die Ro È ntgenstrukturanalyse tetraedrisch von den Stickstoff-Atomen der HNPEt 3 -Moleku È le koordinierte Nickel-Atome. Die Iodid-Ionen sind u È ber N±H´´´I Wasserstoffbru È cken-Kontakte an das Kation gebunden, was zum Aufbau eines Ionentripels fu È hrt.Abstract. Turquoise single crystals of trans-[NiBr 2 (pyridine) 4 ] have been obtained by the reaction of excess pyridine with nickel(II) bromide/diacetonealcohol. According to the crystal structure determination the nickel atom is octahedrally coordinated by the two bromine atoms in trans-position and by the nitrogen atoms of the pyridine molecules. Space group Pna2 1 , Z = 4, lattice dimensions at 20°C: a = 1592.9(2), b = 943.8(1), c = 1413.0(2) pm, R 1 = 0.0492.Dark blue single crystals of the phosphoraneimine complex [Ni(HNPEt 3 ) 4 ]I 2 have been obtained from NiI 2 /H 2 O with excess Me 3 SiNPEt 3 and subsequent recrystallization from acetonitrile. According to the crystal structure determination the nickel atom is tetrahedrally coordinated by the nitrogen atoms of the HNPEt 3 molecules. The iodide ions are connected via N±H´´´I contacts with the cation to form an ion triple. Space group P2 1 /c, Z = 4, lattice dimensions at ±80°C: a = 1934.9(2), b = 1078.3(1), c = 1966.3(2) pm, b = 111.040(8)°; R 1 = 0.043.

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Metal Isotope Effect on Metal-Ligand Vibrations. IX. Far Infrared Spectra of Octahedral Nickel Halide Complexes of Pyridine and γ-Picoline

Abstract: The far infrared spectra of Ni (pyridine)4X2 and Ni(γ-picoline)4X2 (X = CI, Br and I) have been measured. The Ni-X and Ni-N stretching bands have been assigned based on isotopic shifts due to the 58Ni-62Ni, pyridine-pyridine-d5, and Cl-37Cl substitutions.

Cited by 18 publications

References 10 publications

Synthesis, Characterization and Study of Antibacterial Activity of a New Schiff Base Ligand and Its Complexes with Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) Metal Ions

Synthesis, Characterization and Study of Antibacterial Activity of a New Schiff Base Ligand and Its Complexes with Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) Metal Ions

A Resonance Raman Enhancement Mechanism for Axial Vibrational Modes in the Pyridine Adduct of Myoglobin Proximal Cavity Mutant (H93G)

Die Kristallstrukturen vontrans-[NiBr2(Pyridin)4] und [Ni(HNPEt3)4]I2

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