Donor properties of hydroxamic acids

Chatterjee, Basujit

doi:10.1016/s0010-8545(00)80350-1

Cited by 158 publications

(54 citation statements)

References 19 publications

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“…The other Ir band of structural significance in the ligand L 1 L 2 , L 3 ,L 4 appears v 1460 cm -1 which may be assignable to V C=N 19-28 .These band also shifted to higher wave number an complexation which suggest involvement of azomethine N in bonding with metal ions confirmed by appearance a new band in the far infra-red region at 350-365cm-1 in complexes [21][22][23][24][25][26][27] Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The IR spectrum of ligand L 1 (Hm-HBSC) and L 3 (Hp-HBSC) exhibits a band at 1630 cm -1 which may be assigned [20][21][22][23][24][25][26] due to V C=O group of semicarbazone moiety.This band is shifted to higher frequency region with decreased sharpness and intensity in the complexes indicating the participitation of carbonyl oxygen of semicarbazone in the coordination conqfirmed by the appearance of a band in the far IR region at the region 450-465 cm -1 in the complexes may be assigned [20][21][22][23][24][25][26] …”

Section: Resultsmentioning

confidence: 99%

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Synthesis, Characterization and Antimicrobial Studies of Copper (II) Complexes of Semicarbazone and Thiosemicarbazone of m- Hydroxy Benzaldehyde and p-Hydroxy Benzaldehyde

Sapna¹,

Sharma²,

Kohli³

2012

Orientjchem.

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We have synthesized Cu(II) complexes with m-hydroxy benzaldehyde semicarbazone (L1 =Hm-HBSC), m-hydroxy benzaldehyde thiosemicarbazone (L2= Hm-HBTSC), p-hydroxyl benzaldehyde semicarbazone (L3= Hp-HBSC) and p-hydroxybenzaldehyde thiosemicarbazone (L4= Hp-HBTSC). These complexes were characterized through elemental analysis, molecular weight, electrical conductance and magnetic susceptibilities at room temperature .The observed magnetic moments of all these complexes are consistent with the presence of a single unpaired electron. On the basis of above observations the complexes were proposed to be octahedral structure. These complexes were screened for anti-bacterial and antifungal properties and have exhibited potential activity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Antimicrobial Studies of Copper (II) Complexes of Semicarbazone and Thiosemicarbazone of m- Hydroxy Benzaldehyde and p-Hydroxy Benzaldehyde

Sapna¹,

Sharma²,

Kohli³

2012

Orientjchem.

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“…The other chemicals are of analytical grade. The substituted benzohydroxamic acids, HL 1 and HL 2 , were prepared according to a known [36] general procedure. The samples for microanalyses were dried to constant weight in a vacuum (20 8C fractometer, with a graphite monochromator and Mo Ka radiation (l = 0.71073 ä).…”

Section: Methodsmentioning

confidence: 99%

Diorganotin(IV) Derivatives of Substituted Benzohydroxamic Acids with High Antitumor Activity

Liu

Silva

Pombeiro³

2004

Chemistry A European J

107

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A series of diorganotin(IV) and dichlorotin(IV) derivatives of 4-X-benzohydroxamic acids, [HL(1) (X = Cl) or HL(2) (X = OCH(3))] formulated as [R(2)SnL(2)] (R = Me, Et, nBu, Ph or Cl; L = L(1) or L(2)), along with their corresponding mixed-ligand complexes [R(2)Sn(L(1))(L(2))] have been prepared and characterized by FT-IR, (1)H, (13)C, and (119)Sn NMR spectroscopy, mass spectrometry, elemental analysis, and melting points. In addition, single-crystal X-ray diffraction analyses were carried out for [Me(2)SnL(2)] (L = L(1) or L(2)), which show coordination structures intermediate between distorted octahedra and bicapped tetrahedra. The hydroxamate ligands are asymmetrically coordinated by the oxygen atoms, the carbonyl oxygen atom is further away from the metal center than the other oxygen atom. The complexes are stable monomeric species; most of them are soluble not only in chlorohydrocarbon solvents, but also in alcohols and hydroalcoholic solutions. In polar solvents, the mixed-ligand complexes gradually decompose into the corresponding single-ligand complex couples. The complexes exhibit in vitro antitumor activities (against a series of human tumor cell lines) which, in some cases, are identical to, or even higher than, that of cisplatin. For the dialkyltin complexes, the activity increases with the length of the carbon chain of the alkyl ligand and is higher in the case of the chloro-substituted benzohydroxamato ligand. The [nBu(2)Sn(L(1))(2)] complex displays a high in vivo activity against H22 liver and BGC-823 gastric tumors, and has a relatively low toxicity.

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“…[9,10] By far the most common mode of metal binding is the bidentate coordination mode through complexes synthesized with the enantiomerically pure R-or S-forms of mandelohydroxamic acid ligand, showed circular dichroism spectra which were mirror images of each other. The pentanuclear complex made from the racemic form of the ligand showed no signals in the CD spectrum.…”

Section: Introductionmentioning

confidence: 99%

Mandelohydroxamic Acid as Ligand for Copper(II) 15‐Metallacrown‐5 Lanthanide(III) and Copper(II) 15‐Metallacrown‐5 Uranyl Complexes

et al. 2006

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The formation of pentanuclear copper(II) complexes with the mandelohydroxamic ligand was studied in solution by electrospray ionization mass spectrometry (ESI-MS), absorption spectrophotometry, circular dichroism and 1 H NMR spectroscopy. The presence of lanthanide(III) or uranyl ions is essential for the self-assembly of the 15-metallacrown-5 compounds. The negative mode ESI-MS spectra of solutions containing copper(II), mandelohydroxamic acid and lanthanide(III) ions (Ln = La, Ce, Nd, Eu, Gd, Dy, Er, Tm, Lu, Y) or uranyl in the ratio 5:5:1 showed only the peaks that could be unambiguously assigned to the following intact molecular

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Donor properties of hydroxamic acids

Cited by 158 publications

References 19 publications

Synthesis, Characterization and Antimicrobial Studies of Copper (II) Complexes of Semicarbazone and Thiosemicarbazone of m- Hydroxy Benzaldehyde and p-Hydroxy Benzaldehyde

Synthesis, Characterization and Antimicrobial Studies of Copper (II) Complexes of Semicarbazone and Thiosemicarbazone of m- Hydroxy Benzaldehyde and p-Hydroxy Benzaldehyde

Diorganotin(IV) Derivatives of Substituted Benzohydroxamic Acids with High Antitumor Activity

Mandelohydroxamic Acid as Ligand for Copper(II) 15‐Metallacrown‐5 Lanthanide(III) and Copper(II) 15‐Metallacrown‐5 Uranyl Complexes

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