Search results for: Kamalaksha Nag

Items from 1 to 17 out of 17 results

chapter

Chemistry of tetra- and pentavalent chromium

Kamalaksha Nag, Satyendra Nath Base

Structure and Bonding > Bond and Structure Models > 153-197

This review provides information on synthesis, reactivities, solid state properties, and electronic and molecular structure of chromium(IV) and chromium(V) compounds that have been isolated in pure form. Spectroscopic properties, especially EPR of Cr⁵⁺ and Cr⁴⁺ ions doped in various host lattices, are also discussed. However, compounds that generated in solution as transient species, or occured as...

article

Sandwich-type lanthanide(III) complexes of a tetraiminodiphenol macrocyclic ligand derived from 4-methyl-2,6-diformylphenol and 1,3-diaminopropane: structure, NMR and luminescence

Pradip Bag, Abhisek Brata Ghosh, Amit Kumar Dutta, Ulrich Flörke, more

Polyhedron > 2015 > 102 > C > 539-548

The macrocyclic ligand salt [H₂LH₂](ClO₄)₂, derived from the [2+2] condensation process involving 4-methyl-2,6-diformylphenol and 1,3-diaminopropane, has been used to synthesize the sandwich-type lanthanide(III) complexes [Ln(LH₂)₂](ClO₄)₃·2H₂O (1–6, Ln=La–Eu, except Pm), [Ln(LH₂)₂](ClO₄)₃·CH₃CN (7–13, Ln=Gd–Lu, except Er) and [Ln(LH₂)(LH)](BPh₄)₂ (14–16, Ln=La, Nd and Sm). The X-ray crystal structures...

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Iron(III) and manganese(III) complexes of a pseudocalixarene tetraiminotetraphenol macrocyclic ligand: Structure, magnetism and electrochemistry

Papu Biswas, Pradip Bag, Amit Kumar Dutta, Ulrich Flörke, more

Polyhedron > 2014 > 75 > Complete > 118-126

The pseudocalixarene tetraiminotetraphenol macrocyclic ligand H ₄ L has been structurally characterized and used to synthesize the complexes [Fe ^III ₂ L(NO ₃ ) ₂ (H ₂ O) ₂ ] (1), [Fe ^III ₂ L(Cl) ₂ ] _∞ (2), [{Fe ^III ₂ L(μ-O)} ₂ ]·2CH ₃ CN·H ₂ O (3), [Mn ^III ₂ L(Cl) ₂ ...

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Macrocyclic lanthanide(III) complexes of iminophenol Schiff bases and carboxylate anions: Syntheses, structures and luminescence properties

Pradip Bag, Swarup Kumar Maji, Papu Biswas, Ulrich Flörke, more

Polyhedron > 2013 > 52 > Complete > 976-985

The mixed-ligand lanthanide(III) complexes derived from the tetraiminodiphenolate (L ¹ H ₂ ) or octaiminotetraphenolate (L ² H ₄ ) macrocyclic ligands and acetate (OAc ⁻ ) or benzoate (OBz ⁻ ) anions have been synthesized and structurally characterized. With the ligand combination L ¹ H ₂ and OBz ⁻ , either the dimeric complexes...

article

Structural, photophysical and electrochemical studies of [RuN6]2+ complexes having polypyridine and azole mixed-donor sites

Supriya Dutta, Sujoy Baitalik, Meenakshi Ghosh, Ulrich Flörke, more

Inorganica Chimica Acta > 2011 > 372 > 1 > 227-236

The mixed-ligand ruthenium(II) complexes [(phen) ₂ Ru(pzbzimH ₃ )](ClO ₄ ) ₂ ·3H ₂ O (1), [(phen) ₂ Ru(bzimH) ₂ ](ClO ₄ ) ₂ ·3H ₂ O (2) and [(bpy) ₂ Ru(bpybzimH ₂ )](ClO ₄ ) ₂ (3), where phen=1,10-phenanthroline, bpy=2,2′-bipyridine, pzbzimH ₃ =pyrazole-3,5-bis(benzimidazole), bzimH=benzimidazole...

article

Multiple metal coordinating behaviour of the tetrapodal ligand 1,1,1,1-tetrakis[(salicylaldimino)methyl]methane

Supriya Dutta, Papu Biswas, Ulrich Flörke, Kamalaksha Nag

Inorganic Chemistry Communications > 2010 > 13 > 9 > 1074-1080

The tetrapodal ligand 1,1,1,1-tetrakis[(salicylaldimino)methyl]methane (H ₄ tsam) has been introduced for the first time for metal complexation. Two zinc(II) complexes[Zn ₂ (tsam)] (1) and [Zn ₃ (Htsam) ₂ ]·2C ₇ H ₈ (2) have been obtained by reacting zinc acetylacetonate with the ligand in the presence of triethylamine, while a cobalt(III) complex [Co(Htsam)]·CH...

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Structure, Stereochemistry, and Physico-Chemical Properties of Trinuclear and Dinuclear Metal(II) Complexes of a Phenol-Based Tetrapodal Schiff Base Ligand ^⊥

Supriya Dutta, Papu Biswas, Ulrich Flörke, Kamalaksha Nag

Inorganic Chemistry > 2010 > 49 > 16 > 7382 - 7400

article

Structural, Spectroscopic, and Proton‐Coupled Electron‐transfer Behavior of Pyrazolyl‐3,5‐bis(benzimidazole)‐Bridged Homo‐ and Heterochiral Ru^IIRu^II, Os^IIOs^II, and Os^IIRu^II 2,2′‐Bipyridine Complexes

Sujoy Baitalik, Supriya Dutta, Papu Biswas, Ulrich Flörke, more

European Journal of Inorganic Chemistry > 2010 > 4 > 570 - 588

The homo‐ and heterobimetallic complexes [(bpy)₂M^II(H₂pzbzim)M′^II(bpy)₂](ClO₄)₃·nH₂O (1, 3, 5) and their corresponding deprotonated complexes [(bpy)₂M^II(pzbzim)M′^II(bpy)₂](ClO₄)·nH₂O (2, 4, 6) [where M^II, M′^II = Ru (1, 2) = Os (3, 4); M^II = Os and M′^II = Ru (3, 5); bpy = 2,2′‐bipyridine; H₃pzbzim = pyrazole‐3,5‐bis(benzimidazole)] were synthesized, separated to their heterochiral (a, ΛΔ/ΔΛ) and homochiral...

article

Solid state and solution properties of lanthanide(III) complexes of a tetraiminodiphenolate macrocyclic ligand. X-ray structure, 1H NMR and luminescence spectral studies

Pradip Bag, Supriya Dutta, Ulrich Flörke, Kamalaksha Nag

Journal of Molecular Structure > 2008 > 891 > 1-3 > 408-419

The lanthanide(III) complexes of composition [Ln(LH ₂ )(H ₂ O) ₃ Cl]Cl ₂ (Ln=La–Lu and Y, 1–15) derived from the tetraiminodiphenolate macrocyclic ligand L ²⁻ have been prepared and characterized. In these compounds, the two uncoordinated imine nitrogens of the macrocycle are protonated and hydrogen-bonded with the metal-bound phenolate oxygens and thereby provide...

article

Halogen Exchange and Scrambling between C−X and M−X‘ Bonds in Copper, Nickel, and Cobalt Complexes of 6,6‘-bis(bromo/ chloromethyl)-2,2‘-bipyridine. Structural, Electrochemical, and Photochemical Studies

Meenakshi Ghosh, Papu Biswas, Ulrich Flörke, Kamalaksha Nag

Inorganic Chemistry > 2008 > 47 > 1 > 281 - 296

article

Synthesis, Reactivities, and Magnetostructural Properties of Fe ^III , Fe ^III −O−Fe ^III , and Zn ^II Fe ^III −O−Fe ^III Zn ^II Complexes of a Tetraiminodiphenolate Macrocycle

Papu Biswas, Meenakshi Ghosh, Sujit K. Dutta, Ulrich Flörke, more

Inorganic Chemistry > 2006 > 45 > 12 > 4830 - 4844

article

Dinuclear Zinc(II) Complexes of Tetraiminodiphenol Macrocycles and Their Interactions with Carboxylate Anions and Amino Acids. Photoluminescence, Equilibria, and Structure

Bula Dutta, Pradip Bag, Ulrich Flörke, Kamalaksha Nag

Inorganic Chemistry > 2005 > 44 > 1 > 147 - 157

article

Efficient Proton-Templated Synthesis of 18- to 38-Membered Tetraimino(amino)diphenol Macrocyclic Ligands: Structural Features and Spectroscopic Properties

Bula Dutta, Pradip Bag, Bibhutosh Adhikary, Ulrich Flörke, more

The Journal of Organic Chemistry > 2004 > 69 > 16 > 5419 - 5427

article

Spectroscopic and redox properties of Rh ^I ^I ^I Ru ^I ^I and Ru ^I ^I Ru ^I ^I complexes derived from 2,2 ^' -bipyridine, pyrazole-3,5-bis(benzimidazole) and 1,2,4-triazole-3,5-dicarboxylic acid as bridging ligands

Sujoy Baitalik, Bula Dutta, Kamalaksha Nag

Polyhedron > 2004 > 23 > 6 > 913-919

The heterovalent heterodinuclear complex [(bpy) ₂ Ru ^I ^I (H ₂ pzbzim)Rh ^I ^I ^I (bpy) ₂ ](ClO ₄ ) ₄ .3H ₂ O (1) and the isovalent homodinuclear complex [(bpy) ₂ Ru ^I ^I (trzdc)Ru ^I ^I (bpy) ₂ ](ClO ₄ ).5H ₂ O (2), where H ₃ pzbzim=pyrazole-3,5-bis(benzimidazole),...

article

Diastereoisomerically pure pyrazole-3,5-dicarboxylate-bridged dinuclear ruthenium(II) and osmium(II) complexes of 2,2 ^' -bipyridine: structural, electrochemical and spectral studies

Sujoy Baitalik, Pradip Bag, Ulrich Flörke, Kamalaksha Nag

Inorganica Chimica Acta > 2004 > 357 > 3 > 699-706

Pyrazole-3,5-dicarboxylate-bridged dinuclear ruthenium(II) and osmium(II) complexes of 2,2 ^' -bipyridine of composition [(bpy) ₂ Ru(pzdc)Ru(bpy) ₂ ](ClO ₄ ).H ₂ O (1) and [(bpy) ₂ Os(pzdc)Os(bpy) ₂ ](ClO ₄ ).H ₂ O (2) have been obtained in high yield and have been separated to their homochiral (ΛΛ/ΔΔ) rac (1a, 2a) and heterochiral...

article

Synthesis, spectroscopic properties and proton-coupled redox activities of mononuclear osmium(II) mixed-chelates derived from pyrazole-3,5-bis(benzimidazole) and 2,2'-bipyridine

Sujoy Baitalik, Pradip Bag, Kamalaksha Nag

Polyhedron > 2002 > 21 > 24 > 2481 - 2488

The mixed-ligand osmium(II) complexes [(bpy) ₂ Os(H ₃ pzbzim)](ClO ₄ ) ₂ .2H ₂ O (1) and [(bpy) ₂ Os(Hpzbzim)].2H ₂ O (2), where H ₃ pzbzim=pyrazole-3,5-bis(benzimidazole) and bpy=2,2'-bipyridine, have been synthesized and spectroscopically characterized. In complex (2), the NH deprotonation occurs at the pyrazole and at one of the metal-bound...

article

Homo- and heterobimetallic complexes of ruthenium(II) and osmium(II) with pyrazole-3,5-dicarboxylic acid and 2,2'-bipyridine as co-ligands. Synthesis, structure, stereochemistry, spectroscopy and redox activities

Sujoy Baitalik, Ulrich Flörke, Kamalaksha Nag

Inorganica Chimica Acta > 2002 > 337 > Complete; P. Chaudhuri > 439 - 449

Mononuclear, homodinuclear and heterodinuclear ruthenium(II) and osmium(II) complexes of composition [(bpy) ₂ Ru(H ₂ pzdc)](ClO ₄ ).3H ₂ O (1), [(bpy) ₂ Os(H ₂ pzdc)](ClO ₄ ).3H ₂ O (2), [(bpy) ₂ Ru(pzdc)Ru(bpy) ₂ ](ClO ₄ ).H ₂ O (3), [(bpy) ₂ Os(pzdc)Os(bpy) ₂ ](ClO ₄ ).H ₂...

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