Tetranuclear Cobalt Complexes as Nano-Dimensional Template for Inclusion of Nitrophenols

Shankar, Krapa; Baruah, Jubaraj B.

doi:10.1002/slct.201601218

Cited by 8 publications

(11 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 2-amino-5-nitrophenol (Figure S7) is also an excellent quencher of the two complexes. These results complement the quenching of emission through O•••π interactions on cobalt(II) 17 and nickel(II) 18 1,10-phenanthroline complexes responsible in photoluminescence quenching by nitroaromatic compounds. The present complexes have the advantages of having simple structures and are readily soluble in DMSO and dimethylformamide (DMF); they are also easily synthesized from commercially available reagents.…”

supporting

confidence: 71%

“…Self-assemblies of metal complexes are prospective candidates for optical devices. − The photoluminescence of small inorganic complexes is an emerging topic of research in the detection of pollutant and hazardous materials. − Functional modifications on coordinated ligands are used in various inorganic syntheses. − Such reactions are extended to prepare coordination polymers poly-nuclear complexes, − rotaxanes, and catenanes. − Hydrolytic transformations of functional groups are in use to prepare coordination polymers, to modify metallo–organic frameworks and dendrimers. , The transformations of functional groups of framework structures, polymers, and nano-dimensional materials are of general interest to chemical sciences. − The functional groups of fluorescent compounds influence detection ability of certain analytes . Some functional groups of metallo–organic frameworks are responsible for sensing volatile organic compounds.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Copper(II), Zinc(II), and Cadmium(II) Formylbenzoate Complexes: Reactivity and Emission Properties

2019

Self Cite

View full text Add to dashboard Cite

Synthesis, characterization, reactivity, and sensing properties of 4-formylbenzoate complexes of copper(II), zinc(II), and cadmium(II) possessing the 1,10-phenanthroline ancillary ligand are studied. The crystal structures of the (1,10-phenanthroline)bis(4-formylbenzoate)(aqua)copper(II) and (1,10-phenanthroline)bis(4-formylbenzo-ate)zinc(II) and a novel molecular complex comprising an assembly of mononuclear and dinuclear species of (1,10-phenanthroline)bis(4-formylbenzoate)cadmium(II) are reported. These zinc and cadmium complexes are fluorescent; they show differentiable sensitivity to detect three positional isomers of nitroaniline. The mechanism of sensing of nitroanilines by 1,10-phenanthroline and the complexes are studied by fluorescence titrations, photoluminescence decay, and dynamic light scattering. A plausible mechanism showing that 1,10-phenanthroline ligand-based emission quenched by electron transfer from the excited state of 1,10-phenanthroline to nitroaniline is supported by density functional theory calculations. In an anticipation to generate a fluorescent d10-copper(I) formylbenzoate complex by a mild reducing agent such as hydroxylamine hydrochloride for similar sensing of nitroaromatics as that of the d10-zinc and cadmium 4-formylbenzoate complexes, reactivity of d9-copper(II) with hydroxylamine hydrochloride in the presence of 4-formylbenzoic acid and 1,10-phenanthroline is studied. It did not provide the expected copper(I) complex but resulted in stoichiometry-dependent reactions of 4-formylbenzoic acid with hydroxylamine hydrochloride in the presence of copper(II) acetate and 1,10-phenanthroline. Depending on the stoichiometry of reactants, an inclusion complex of bis(1,10-phenanthroline)(chloro)copper(II) chloride with in situ-formed 4-((hydroxyimino)methyl)benzoic acid or copper(II) 4-(hydroxycarbamoyl)benzoate complex was formed. The self-assembly of the inclusion complex has the bis(1,10-phenanthroline)(chloro)copper(II) cation encapsulated in hydrogen-bonded chloride-hydrate assembly with 4-((hydroxyimino)methyl)benzoic acid.

show abstract

supporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Copper(II), Zinc(II), and Cadmium(II) Formylbenzoate Complexes: Reactivity and Emission Properties

2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…The aggregation induced emission of certain naphthalimide derivatives has been explored; , on the other hand the hydration of metal–organic frameworks and self-assemblies of inorganic complexes or organic compounds are commonly used for detection of water in solvent by fluorescence modulation, − but our present findings clearly depict that in the case of an ICT driven fluorophore such as HL the native fluorescence state matters that can be fine-tuned to switch on and off by changing the parameters contributing to the orientation of the group contributing to stabilize such a state controlling interactions among the chromophore or modifying electron delocalization. On the other hand, the fluorescence sensing of nitro compounds by fluorescence ON and OFF process shown by receptors such as quantum dots and inorganic, organic receptors are widely studied; − the present example also adds one to such possibility with a difference that the aggregation induced state can be first generated through water and further exploited to quench emission from such a state by adding aromatic nitro-phenolic compounds.…”

Section: Resultsmentioning

confidence: 99%

Changing π-Interactions and Conformational Adjustments of N-(Isonicotinylhydrazide)-1,8-naphthalimide by Hydration and Complexation Affect Photophysical Properties

Tarai

Baruah

2017

Crystal Growth & Design

Self Cite

View full text Add to dashboard Cite

Noncovalent self-assemblies of different forms of a 1,8-naphthalimide derivative N-(isonicotinylhydrazide)-1,8-naphthalimide adopt different conformational adjustments due to the interplay of weak interactions. In such assemblies stacking interactions significantly contribute to direct the orientations of tether, which also influenced packing patterns. Effects of weak noncovalent interactions are reflected in the physicochemical properties of solvate and metal complexes of this naphthalimide derivative. Dual fluorescence emissions were observed from hydrate and silver complex of N-(isonicotinylhydrazide)-1,8-naphthalimide, which was not observed in anhydrous form of the compound. These results are compared with fluorescence emission study performed with solution of N-(isonicotinylhydrazide)-1,8-naphthalimide. Aggregation induced fluorescence emission of a solution in DMSO was caused by adding water. This emission in solution occurred at a much different emission wavelength than the emission observed from the hydrated sample in the solid state. It is also established that the aggregation induced fluorescence of N-(isonicotinylhydrazide)-1,8-naphthalimide caused by adding water to a solution of the compound in dimethyl sulfoxide can be quenched by different nitro-phenols.

show abstract

“…The strength of associations with guests and kinetics of delivery caters to understand transport and delivery of guests. Identification of stable host-assemblies from which guest can be easily removed, [143][144][145][146][147][148] search for new templates for molecular recognitions, [149][150][151][152][153] self-assembling leading to properties such as gelation, 154 will continue to be challenges. Host-guest assemblies with comparable sizes and their recognition of, for example, C 60 as guest included in metal-porphyrin 155,156 for photochemical conversion have future ahead.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Predominantly ligand guided non-covalently linked assemblies of inorganic complexes and guest inclusions

Baruah

2018

J Chem Sci

View full text Add to dashboard Cite

Various non-covalently linked inorganic self-assemblies formed by the supramolecular interacting sites located at the ligands are discussed. The impetus for this rapidly growing topic on the construction of robust assemblies is elucidated by select examples that are associated with interesting structures and properties. The review includes discussion on the stabilization of different assemblies of nucleobases in the non-covalent assemblies of inorganic complexes. The participation of the guest molecules in the formation of self-assemblies with hosts to make extra space or voids for intake of the guest, water-assisted assemblies, changes in the structures guided by cations, and aggregation-induced photoluminescence in the self-assemblies of metal complexes are presented. Fine-tuning of non-covalent self-assemblies of metal complexes by changing ligands or by other components, which modify the guest recognition abilities is elucidated. The discussions are based on selected examples of self-assemblies that use supramolecular features of peripheral part of ligands or ligand of a complex that helps one to identify templates for weak interactions and for molecular recognition.

show abstract

Tetranuclear Cobalt Complexes as Nano-Dimensional Template for Inclusion of Nitrophenols

Cited by 8 publications

References 66 publications

Copper(II), Zinc(II), and Cadmium(II) Formylbenzoate Complexes: Reactivity and Emission Properties

Copper(II), Zinc(II), and Cadmium(II) Formylbenzoate Complexes: Reactivity and Emission Properties

Changing π-Interactions and Conformational Adjustments of N-(Isonicotinylhydrazide)-1,8-naphthalimide by Hydration and Complexation Affect Photophysical Properties

Predominantly ligand guided non-covalently linked assemblies of inorganic complexes and guest inclusions

Contact Info

Product

Resources

About