Some new organotin(IV) complexes with kojic acid and maltol

Jain, Reena; Kaushik, N. K.

doi:10.1007/bf01996755

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…Both bands near 1600 cm -1 , assigned to the v(C=O) and v(C=C) stretching frequency, undergo a complexation-promoted bathochromic shift. 12 These data strongly support the theory that KA is coordinated to the aluminum ion through the oxygen atom of the -OH (enolic) group, forming a five-membered chelate.…”

Section: Infraredsupporting

confidence: 68%

“…The main KA IR bands are in accordance with those found in the literature. [12][13][14]25 The regions that significantly changed were 700-800 cm -1 , 1100-1050 cm -1 and 1300-1700 cm -1 for all complexes obtained at pHs higher than 3. The first two regions were used to observe the effect of complexation on the alcohol groups (-C-OH and -C=C-OH), whereas the last region was useful for studying the carbonyl group.…”

Section: Infraredmentioning

confidence: 94%

“…Using nuclear magnetic resonance for experiments on KA hydrogens, the disappearance of the complexation peak corresponding to enolic hydroxyl can be observed and a shift of two hydrogens to a lower field can be attributed to the involvement of carbonyl C4 and C5 of the enolic group. 12 According to Peana et al, 26 the trivalent aluminium mainly forms dinuclear helicate complexes of M2L3 stoichiometry, and its coordination involves the two hydroxypyrone oxygen donor atoms. NMR results give evidence of a rigid and symmetric structure of L9-Al III complexes up to physiological pH.…”

Section: Nmrmentioning

confidence: 99%

“…The band characterized by this transition shifts to longer wavelength on complexation, showing the involvement of the C=O group in complexation. 12 For example, the complex [(KA) 3 AlH 2 ] 2+ , whose geometry optimized structure is shown below.…”

Section: Electronic Spectroscopymentioning

confidence: 99%

“…10 In addition, KAH can prevent the conversion of the o-quinones of DL-DOPA to melanin. 11 Based on these properties, it has been used as a food additive to prevent enzymatic browning 12 and also employed as skin lightening agent in cosmetics because of its excellent whitening properties. 13 Cosmetic preparations based on the association of KAH and hydroquinone have been employed for skin lightening treatments.…”

Section: Introductionmentioning

confidence: 99%

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Elucidation of the electronic spectrum changes of KA-Al3+ complex by potentiometric titration, FTIR, 13C RMN and Quantum Mechanics

Piantavini¹,

Gonçalves²,

Trindade³

et al. 2017

Quim. Nova

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publicado na web em 31/05/2017Kojic acid (KA) is an organic acid widely used in pharmaceutical industry, mainly as a skin lightening agent. Based on the ability of KA to form complexes with ions, we found the most possible kind of complex formed with cation aluminum. KA-Al 3+ complex structures were studied using potentiometric and spectrophotometric (UV) titrations, FTIR and 13 C NMR. The electronic spectroscopy showed that the KA-Al 3+ complexes absorb at higher wavelengths (λ max = 305 nm) than do the non-complexed KA (λ max = 269 nm), confirming complexation. The IR spectra of KA complexed and not complexed allowed us to correlate the changes in the absorption of enol and carbonyl groups in absence and presence of Al 3+ in aqueous solutions. The complexation suggested by the potentiometric titration and FTIR spectroscopy are in accordance with the data obtained from NMR results. Calculations based on quantum mechanics were utilized to understand the differences found in the noncomplexed and complexed KAH electronic spectra

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Section: Infraredsupporting

confidence: 68%

Section: Infraredmentioning

confidence: 94%

Section: Nmrmentioning

confidence: 99%

Section: Electronic Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Elucidation of the electronic spectrum changes of KA-Al3+ complex by potentiometric titration, FTIR, 13C RMN and Quantum Mechanics

Piantavini¹,

Gonçalves²,

Trindade³

et al. 2017

Quim. Nova

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Synthesis of Metal Enolato Complexes

Vicente

2010

Patai's Chemistry of Functional Groups

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Introduction Synthesis from Ketones, Aldehydes and Esters Synthesis from Ketenes, Isocyanates and Acyl Halides Synthesis from Carbon Monoxide and Carbonyl Complexes Synthesis via Cleavage of Ethers and Related Compounds Synthesis from Oxo, Hydroxo or Alkoxo Complexes Oxygenation Reactions Miscellaneous Reactions Acknowledgments

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Synthesis and Fe(III)‐complexation ability of polyurethane bearing kojic acid skeleton in the main chain prepared by polyaddition of aliphatic hydroxyl groups without protection of phenolic hydroxyl groups

Ochiai

Kamiya

Endō

2012

J. Polym. Sci. A Polym. Chem.

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Polyaddition of a kojic acid dimer and diisocyanates yielded polyurethane with metal‐coordination ability owing to the phenolic hydroxyl groups of kojic acid. Although the kojic acid dimer contains two phenolic and two aliphatic hydroxyl groups, 1,5‐diazabicyclo[4.3.0]non‐5‐ene catalyzed polymerization proceeded through highly selective reactions of the aliphatic hydroxyl groups without any protection of the phenolic hydroxyl groups. The resulting polymers complexed with FeCl3, and specific colorizations were observed. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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Some new organotin(IV) complexes with kojic acid and maltol

Cited by 7 publications

References 19 publications

Elucidation of the electronic spectrum changes of KA-Al3+ complex by potentiometric titration, FTIR, 13C RMN and Quantum Mechanics

Elucidation of the electronic spectrum changes of KA-Al3+ complex by potentiometric titration, FTIR, 13C RMN and Quantum Mechanics

Synthesis of Metal Enolato Complexes

Synthesis and Fe(III)‐complexation ability of polyurethane bearing kojic acid skeleton in the main chain prepared by polyaddition of aliphatic hydroxyl groups without protection of phenolic hydroxyl groups

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