Dimeric 5-coordinate oxovanadium(IV) complexes of tridentate benzoyl hydrazones

Rastogi, D. K.; Sahni, Suresh K.; Rana, V. B.; Dua, Kavita; Dua, S.K.

doi:10.1016/0022-1902(79)80386-3

Cited by 36 publications

(6 citation statements)

References 32 publications

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“…1 (a) The binding sites of the template ligands to form the second type of metallacrown (b) The binding sites of the new ligand in our work [27]. In addition, a strong band found at 1,541 cm -1 is assigned to C=N-N=C group [27][28][29]. In the compound 2, the absence of the N 2 -H, the weakness of the C=O and C=N stretching vibration bands is consistent with the deprotonation of the CONH groups and coordination to the Fe(III) ion.…”

Section: Ir Spectroscopymentioning

confidence: 96%

A novel 18-membered metallacrown containing a double-azathiacrown

Luo

Sun

et al. 2007

Transition Met Chem

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A new type of 18-metallacrown-6, [Fe 6 (H 2 O) 6 L 6 ] (L = 1-(2-hydroxy-benzoyl)-thiosemicarbazide), has been prepared and characterized. The backbone of this metalorganic assembly is the double-azathiacrown, which is formed by six repeating units of the five-membered rings [Fe-S-C-N-N]. It is the first metal complex containing a double-azathiacrown. Due to the meridional coordination of the ligand to the Fe 3+ ion, the ligand enforces the stereochemistry of the Fe 3+ ions as a propeller configuration with alternating K/D forms. Antibacterial screening data showed that the metallacrown has strong antimicrobial activity against Escherichia coli and Staphylococcus aureus.

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Section: Ir Spectroscopymentioning

confidence: 96%

A novel 18-membered metallacrown containing a double-azathiacrown

Luo

Sun

et al. 2007

Transition Met Chem

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“…Bands at 3298, 3199 and 2710 cm À1 are assigned to m(OAH) vibrations which may be involving intramolecular hydrogen bonding, while band at 1126 and 1235 cm À1 is attributed to m(OAH) (phenolic) [35,36]. In addition, a strong band found at 1604 cm À1 is assigned to C@NAN@C group [34][35][36]. In the title compound 2, the absence of the NAH and C@O stretching vibration bands is consistent with the deprotonation of the CONH groups and coordination to the Mn(III) ion.…”

Section: Spectral Characterizationmentioning

confidence: 99%

Synthesis, crystal structure and bioactivity of a novel 18-metallacrown-6 [Mn6(H2O)6 (anshz)6]·10DMF

Jin

Xiao

Cheng

et al. 2006

Journal of Organometallic Chemistry

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“…[30] Bands at 3302, 2932, and 2683 cm −1 are assigned to υ(O-H) vibrations, which may be involving intramolecular hydrogen bonding, while band at 1126 and 1178 cm −1 is attributed to υ(O-H) (phenolic). [31,32] In addition, a strong band found at 1597 cm −1 is assigned to C N-N C group. [30][31][32] In the compound 2, the absence of the N-H and C O stretching vibration bands is consistent with the deprotonation of the CONH groups and coordination to the Fe(III) ion.…”

Section: Spectral Characterizationmentioning

confidence: 99%

“…[31,32] In addition, a strong band found at 1597 cm −1 is assigned to C N-N C group. [30][31][32] In the compound 2, the absence of the N-H and C O stretching vibration bands is consistent with the deprotonation of the CONH groups and coordination to the Fe(III) ion. The broad band at 3422 cm −1 is reasonably assigned to OH stretching vibrations, and the band is attributable to coordinated H 2 O molecules.…”

Section: Spectral Characterizationmentioning

confidence: 99%

Synthesis, Crystal Structure, and Bioactivity of a Novel Iron(III) 18-Metallacrown-6 Complex

Zhong

Zhang

et al. 2012

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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A macrocyclic hexanuclear iron(III) 18-metallacrown-6 compound, [Fe 6 (H 2 O) 6 (abshz) 6 ]·38H 2 O, has been prepared using a trianionic pentadentate ligand N-acetyl-5-bromosalicylhydrazidate (abshz 3− ) and characterized by X-ray diffraction. The crystal structure contains a neutral 18-member metallacrown ring consisting of six Fe(III) and six abshz 3− ligands. The 18-member metallacrown ring is formed by the succession of six structural moieties of the type [Fe(III)-N-N]. Due to the meridional coordination of the ligand to the Fe 3+ ion, the ligand enforces the stereochemistry of the Fe 3+ ions as a propeller configuration with alternating / forms. The disc-shaped hexanuclear ring shows at its largest diameter about 7.27 Å at entrance and about 9.80 Å at the center of the cavity. Antibacterial screening data showed that the iron metallacrown has strong antimicrobial activity against Bacillus subtilis and Staphylococcus aureus.Keywords bioactivity, crystal structure, iron complex, metallacrown INTRODUCTIONAs one type of macrocyclic polynuclear complexes, metallacrowns and its analogies have attracted considerable attention since the first report of metallacrown ether. [1] In the structure, metallacrowns [2] exhibit a cyclic hole generally analogous to crown ethers [3] with transition metal ions and a nitrogen atom replacing the methylene carbons. The presence of transition metal ions in the metallacrown ring leads to a class of molecules with features distinct from the simple organic crowns, such as strong visible absorption spectra, redox activity, magnetism, molecular recognition, and bioactivity.

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Dimeric 5-coordinate oxovanadium(IV) complexes of tridentate benzoyl hydrazones

Cited by 36 publications

References 32 publications

A novel 18-membered metallacrown containing a double-azathiacrown

A novel 18-membered metallacrown containing a double-azathiacrown

Synthesis, crystal structure and bioactivity of a novel 18-metallacrown-6 [Mn6(H2O)6 (anshz)6]·10DMF

Synthesis, Crystal Structure, and Bioactivity of a Novel Iron(III) 18-Metallacrown-6 Complex

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