55 research outputs found
Electrochemical studies of ruthenium compounds part I. ligand oxidation levels
This article does not have an abstract
Synthesis, characterization and properties of nickel(II)pseudohalide complexes of types [Ni(pap)<sub>2</sub>(X)<sub>2</sub>], [Ni(pap)<sub>2</sub>(X)]<sub>2</sub>(Y)<sub>2</sub> and [Ni(pap)(N<sub>3</sub>)<sub>2</sub>]<sub>n</sub> [pap=2-(phenylazo)pyridine; X=N<sub>3</sub><sup>ˉ</sup>, NCSˉ, NCOˉ; Y=ClO<sub>4</sub>ˉ, PF<sub>6</sub>ˉ]
2474-2479Three different types of nickel(II)pseudohalide
compounds, viz. red-brown [Ni(pap)2(X)2] [pap=2-(phenylazo)pyridine;
X=N3ˉ, 1; NCSˉ, 2; NCOˉ 3], greenish-brown
[Ni(pap)2(X)]2(Y)2 (X= N3ˉ , Y=ClO4ˉ,
4; X= N3ˉ ,
Y=PF6ˉ , 5; X=NCOˉ, Y=ClO4ˉ, 6; X= NCOˉ, Y=
PF6ˉ, 7) and brownish-green, [Ni(pap)(N3)2]n
(8) have been prepared and characterised on the basis of microanalytical,
spectroscopic, magnetic, electrochemical and other physicochemical properties. In
IR, v(N=N) stretching frequency is observed at considerably lower frequencies
(-1370 cm-1) than the free ligand value (1425 cm-1) indicating
substantial Ni (II)→ pap π-back bonding and in electronic
spectra, the MLCT bands show characteristic lower energy shifts in going from mono-
to polynuclear compounds via dinuclear ones. Room temperature magnetic measurements
show uniformly two-electron paramagnetism for each nickel(II) ion in these complexes.
Electrochemical electron transfer study reveals nearly- reversible responses corresponding
to NiIII/NiII couple in acetonitrile solutions. On the negative
side of SCE, multiple ligand reductions pertaining to azo reductions are observable
Synthesis, characterization and properties of nickel(II)pseudohalide complexes of types [Ni(pap)<sub>2</sub>(X)<sub>2</sub>], [Ni(pap)<sub>2</sub>(X)]<sub>2</sub>(Y)<sub>2</sub> and [Ni(pap)(N<sub>3</sub>)<sub>2</sub>]<sub>n</sub> [pap=2-(phenylazo)pyridine; X=N<sub>3</sub><sup>ˉ</sup>, NCSˉ, NCOˉ; Y=ClO<sub>4</sub>ˉ, PF<sub>6</sub>ˉ]
2474-2479Three different types of nickel(II)pseudohalide
compounds, viz. red-brown [Ni(pap)2(X)2] [pap=2-(phenylazo)pyridine;
X=N3ˉ, 1; NCSˉ, 2; NCOˉ 3], greenish-brown
[Ni(pap)2(X)]2(Y)2 (X= N3ˉ , Y=ClO4ˉ,
4; X= N3ˉ ,
Y=PF6ˉ , 5; X=NCOˉ, Y=ClO4ˉ, 6; X= NCOˉ, Y=
PF6ˉ, 7) and brownish-green, [Ni(pap)(N3)2]n
(8) have been prepared and characterised on the basis of microanalytical,
spectroscopic, magnetic, electrochemical and other physicochemical properties. In
IR, v(N=N) stretching frequency is observed at considerably lower frequencies
(-1370 cm-1) than the free ligand value (1425 cm-1) indicating
substantial Ni (II)→ pap π-back bonding and in electronic
spectra, the MLCT bands show characteristic lower energy shifts in going from mono-
to polynuclear compounds via dinuclear ones. Room temperature magnetic measurements
show uniformly two-electron paramagnetism for each nickel(II) ion in these complexes.
Electrochemical electron transfer study reveals nearly- reversible responses corresponding
to NiIII/NiII couple in acetonitrile solutions. On the negative
side of SCE, multiple ligand reductions pertaining to azo reductions are observable
Isomeric 2-(arylazo)pyridine complexes of osmium dichloride and osmium dibromide
This article does not have an abstract
Synthesis, characterization and properties of mono-, di- and polynuclear nickel(II) pseudohalide complexes containing bidentate Schiff bases. X-ray structure of [Ni(Ni,Np)₂(NCS)₂] [Ni,Np = N-((pyridin-2-yl)benzylidene) benzylamine]
9-17Three different types of nickel(II) pseudohalide compounds, [Ni(Ni,Np)₂(X)₂] [Ni,Np = N-((pyridin-2-yl)benzylidene) benzylamine; X = N₃⁻, 1; X = NCS⁻, 2; X = NCO-, 3], [Ni(Ni,Np)₂(X)]₂(Y)₂ [X = N₃⁻, Y = ClO4⁻, 4; X = N₃⁻, Y = PF6⁻, 5;
X = NCO⁻, X = ClO4⁻, 6; X = NCO⁻, Y = PF6⁻, 7] and [Ni(Ni,Np)(N₃)2]n (8) have been prepared and characterized using microanalytical, spectroscopic and other physicochemical results. Single crystal X-ray study of one of the mononuclear compounds, [Ni(Ni,Np)₂(NCS)₂] (2) has been done. Structural analysis reveals that the metal center in 2 adopts a distorted octahedral geometry with an NiN6 chromophore coordinated through four N atoms of two bidentate L units and two N atoms of terminal thiocyanate in mutual cis orientation. The mononuclear units in 2 are engaged in intermolecular weak
C-H…S hydrogen bonding to give a 1D chain. Electrochemical electron transfer study reveals nearly-reversible responses to NiIII/NiII couple in acetontrile solutions. High-energy intraligand 1(π-π *) fluorescence at room temperature and intraligand ³ (π-π*) phosphorescence in glassy solutions (MeOH at 77 K) are seen in all the complexes
Synthesis and characterization of [Mn(diik)₃](ClO₄)₂ [diik = N,N'-carbonyldiimidazole and [Mn(imH)₆](ClO₄)₂ [imH = imidazole]: A 2D supramolecular sheet structure in [Mn(imH)₆](ClO₄)₂ through N-H…O and C-H…O hydrogen bonds
1753-1757Two mononuclear complexes [Mn(diik)₃](ClO₄)₂ (1) [diik = N,N'-carbonyldiimidazole] and [Mn(imH)₆](ClO₄)₂ (2) [imH = imidazole] are isolated and characterized using microanalytical, spectroscopic and other physicochemical results.
X-ray structural study of 2 reveals Mn(II) center to assume centrosymmetric octahedral geometry with an MnN₆ chromophore ligated by six N atoms of the six imH unit. The mononuclear units in 2 are engaged in N-H…O and C-H…O hydrogen bondings leading to a 2D sheet structure in ac plane. Complexes 1 and 2 display intraligand ¹ (π-π*) fluorescence at room temperature
Syntheses, structures and luminescence behaviour of some zinc(II) complexes containing acetate and tetradentate Schiff bases
Doubly bridged heptacoordinated cadmium(II) compounds containing a tetradentate Schiff base:Variance in molecular and crystalline architectures with pseudohalides
Synthesis, structure and luminescence behaviour of zinc(II) complexes containing hexadentate N-donor Schiff bases
2427-2432Six hexacoordinated zinc(II) complexes of
the type [Zn(L)](Y)2 [L = N-(1-pyridin-2-yl-formylidene)-N'-[2-({2-[(1-pyridin-2-ylformylidene)amino]ethyl}amino)ethyl]ethane-
1,2-diamine (pfad), Y = ClO4 (1a), Y = PF6 (1b);
L = N-(1-pyridin-2-ylmethylidene)-N'-[2-({2 -I(1-pyridin-2-ylmethylidene)amino)ethyl]amino)ethyl)ethane-
1,2-diamine (pmad), Y = ClO4ˉ (2a), Y= PF6-
(2b); L = N-(l-pyridin-2-ylbenzylidene)-N'-[2-({2-[(l-pyridin-2 ylbenzylidene)amino]-ethyl]amino)ethyl]ethane-
1,2-diamine (pbad), Y = ClO4ˉ (3a), Y = PF6-
(3b)] have been synthesised and characterized on the basis of microanalytical,
spectroscopic and other physicochemical
properties. Structural analysis of 3a reveals that zinc(II) adopts a distorted
octahedral environment with a ZnN6 chromophore ligated by two pyridine
N atoms (N1, N1*), two imine N atoms (N2, N2*) and two amine N atoms (N3, N3*) in
cis-trans-cis orientation. Spectral properties show that the other complex
ions are iso-structural with the dication in 3a.</b
Osmium azo oxime chemistry. Facial tris chelate and trinuclear OsMOs species
This article does not have an abstract
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