Tetradentate S<scp>CHIFF</scp> Base Complexes of Lead(IV)

Biradar, N.S.; Kulkarni, V.H.

doi:10.1002/zaac.19713810308

Cited by 34 publications

(4 citation statements)

References 9 publications

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“…Benzaldehyde exhibits the CO stretch at 1700 cm –1 , which shifts to 1665 cm –1 by incorporation of a o -hydroxy group in salicylaldehyde. Reaction with 1,2-phenylendiamine results in the formation of H 2 salophen with a CN stretch at 1616 cm –1 . − Thus, the band at 1614 cm –1 in H 2 carl Cl is assigned to the aldimine CN stretch.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Probing the Radialene-Character in Triplesalophen Ligands by Spectroscopic and Structural Analysis

et al. 2012

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The triplesalen ligand system based on three salen-like coordination environments bridged by a common phloroglucinol ring has been designed and successfully applied for the rational synthesis of single-molecule magnets from two trinuclear triplesalen complexes and one hexacyanometallate by supramolecular recognition. In order to optimize this system with respect to magnetic anisotropy, the triplesalophen ligand system has been identified, which should allow for the synthesis of nonanuclear complexes composed of two trinuclear triple-salophen complexes and three connecting units. Herein, the convergent synthesis of the triplesalophen ligand system is described, which differs fom the divergent strategy for the triplesalen ligand system. The molecular and elecrtronic structures of the triplesalophen ligands H(6)baron(R) (R = Me, Cl, Br) have been established by single-crystal X-ray diffraction, NMR, FTIR, and UV-vis spectroscopies. These complementary methods allowed the assignment of the central compartment not to be in the O-protonated tautomer but in the N-protonated tautomer with the prevalence of a keto-enamine resonance description, which resembles a heteroradialene. Furthermore, the comparison with the mononucleating unsymmetrical salophen reference ligand H(2)carl(Cl) and with compounds from the literature provides unique signatures for the appearance of the heteroradialene motif not only in NMR spectra and structural parameters but also in IR and UV-vis spectra. These signatures form the basis for the interpretation and understanding of the electronic structures of transition metal complexes with the triplesalophen ligand system.

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Section: Analysis and Discussionmentioning

confidence: 99%

Probing the Radialene-Character in Triplesalophen Ligands by Spectroscopic and Structural Analysis

et al. 2012

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“…The phenyl ring C(1)-C(6) is planaro (plane IV) with a maximum deviation of 0.045 (7)A for the 0(2) atom. However from the plane formed from the atoms C(9)-C(14) (plane V) the atoms C (16) and O(4) present deviations of 0.178(5) A and 0.201 (5) A respectively. The angle between planes IV and V is 4.13(5)", very close to that found between the planes I1 and 111.…”

Section: Resultsmentioning

confidence: 97%

“…Evidence for the coordination through the nitrogen causes the positive shift of the stretching (N-0) mode observed at 1025 and 965cm-I in the complex [14], whereas in the free ligand appeared at 1010 and 940 cm-l respectively. The anionic character of the ligand and the coordination through the phenolic oxygen inferred from the absence of the band at 1405 cm-', which is due to the in-plane 0-H bending mode of the phenolic hydroxyl [15] and also from the shift towards higher energy of the C-0 band in the complex at 1330cm-', as compared to the position 1285 cm-' in the free ligand [16]. The new medium intensity band of the complex at 600cm-' can be attributed to Ni-N bond.…”

Section: Resultsmentioning

confidence: 99%

Crystal, molecular, and electronic structure of Trans‐bis[ethanone, 1‐(2‐hydroxyphenyl)‐oximato]Nickel(II)

Hatzidimitriou

Uddin

Lalia‐Kantouri

1997

Zeitschrift anorg allge chemie

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The compound [Ni(apo~)~], (where apoxdenotes the anion of 2-hydroxyacetophenoneoxime, C8H8N02-), was prepared and studied by means of spectroscopic (IR, 'H NMR, UV-Vis) measurements and theoretical calculations employing the Hiickel method. The structure was determined by X-ray diffraction studies. The unit cell is monoclinic (space group P21/c)0 with dimensions a = 7.845(1), Keywords: 2-Hydroxyacetophenoneoxime complex; nickel b = 9.911(2), c = 19.371(2) A, ,b'= 94.37(1)" and contains four formula units. Hiickel investigations in comparison with the electronic excitation spectrum revealed that the two bands at 2.73 and 2.62 pm-' can be characterised as MLCT, the band at 1.62 pm-' as d-d transition, while the band at 2.14 cm-' has a mixed character of both MLCT and d-d transition.complex, Ni(CxHgN02)2; crystal structure Kris tall-, Molekularund Elek tronens truktur von Trans-Bis[ e thanon,l-(Zhy drox yphenyl)oximato]nickel( 11) Inhaltsiibersicht. [ N i ( a p~x )~] (apox = Anion des 2-Hydroxy-Z = 4. Hiickel-Rechnungen im Zusammenhang mit dem acetophenonoxims, C8H8NOZ-) wurde dargestellt und durch Elektronenspektrum zeigen, daB die Banden bei 2,73 und spektroskopische Messungen (IR, 'H NMR, UV-Vis) und 2,62 pm-' als MLCT und bei 1,62 pm-l als d-d-Ubergang theoretische Berechnungen mit der Hiickel-Methode unter-charakterisiert werden konnen, wahrend die bei 2,14 pm-' sucht. Die Struktur wurde durch Rontgenstrukturanalyse er-einen gemischten Charakter von MLCT und d-d-Ubergang mittelt. Elementarzelle: monoklin, RaumGruppe P2'/c mit aufweist. a = 7,845(1), b = 9,911(2), c = 19,371(2) A, / I = 94,37(1)",

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“…16 This band disappears in the spectra of the metal complexes, suggesting deprotonation of this functional group. 18 The appearance of new strong and medium intensity bands in the spectra of the complexes in the regions, » 1555-1525 cm -1 and » 1370-1345 cm -1 may be attributed to n(B¬N) 19 and n(B-O), 20 respectively. The band at » 1630 cm -1 in the metal complexes, indicates the coordination of the azomethine nitrogen to the boron atom, 17 whereas the other one is due to uncoordinated azomethine groups.…”

Section: Ir Spectramentioning

confidence: 97%

Synthesis and characterization of some new coordination compounds of boron with mixed azines

et al. 2007

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Some new boron complexes have been synthesized by the reaction of triisopropohxyborane with the mixed azines, prepared by the condensation of salicylaldehyde and hydrazine with aldehydes/ketones in a 1:1:1 mole ratio to give a new series of (OPr i ) 2 B(NO) type of complexes. Their structures were confirmed on the basis of elemental analyses, ultraviolet, infrared, 1 H-NMR and 11 B-NMR spectral studies. The ligands and their boron complexes were also screened for their antifungal activity. Several of these complexes were found to be quite active in this respect.

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Tetradentate SCHIFF Base Complexes of Lead(IV)

Cited by 34 publications

References 9 publications

Probing the Radialene-Character in Triplesalophen Ligands by Spectroscopic and Structural Analysis

Probing the Radialene-Character in Triplesalophen Ligands by Spectroscopic and Structural Analysis

Crystal, molecular, and electronic structure of Trans‐bis[ethanone, 1‐(2‐hydroxyphenyl)‐oximato]Nickel(II)

Synthesis and characterization of some new coordination compounds of boron with mixed azines

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