Untitled

et al. 2001

Z. anorg. allg. Chem.

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Pyridil bis(N(4)-substituted thiosemicarbazones) have been prepared in which the substituents in place of the NH 2 group in the thiosemicarbazone moieties are piperidinyl (H 2 Plpip), hexamethyleneiminyl (H 2 Plhexim), diethylaminyl (H 2 Pl4DE), and dipropylaminyl (H 2 Pl4DP). IR, electronic, mass, and ESR spectra of their copper(II) complexes are reported. Crystal structure determinations of H 2 Pl4DE and three of the copper(II) complexes of formula [Cu(Plpip)], [Cu(Plhexim)] and [Cu(Pl4DE)] 2´2 [Cu(Pl4DE)], are included. H 2 Pl4DE lacks hydrogen bonding between the thiosemicarbazone moieties, but each moiety is in the Z confi-guration form with hydrogen bonding from the thiosemicarbazone moieties to the pyridyl nitrogen atoms. The crystal used for the structure determination of [Cu(Plhexim)] was isolated from an electrochemical preparation. In all the new compounds the deprotonated ligands are N,N,S,S-tetradentate, coordinating to the copper(II) centre through their azomethine nitrogen atoms and their thiocarbonyl sulfur atoms.

Section: Esr Spectrasupporting

confidence: 55%

Structural and Spectral Study of Copper(II) Complexes of Pyridilbis{3-piperidyl-,bis{hexamethyleneiminyl-,bis{N(4)-diethyl-, andbis{N(4)-dipropylthiosemicarbazones}

et al. 2001

Z. anorg. allg. Chem.

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“…In contrast to many of the previously studied bis{N(4)-substituted thiosemicarbazones} with reported structures (i. e., those derived from pyruvaldehyde [5], 1-phenylglyoxal [6±9] and 1-phenyl-1,2-propanedione [6,10]), the two thiosemicarbazone moieties of H 2 Plpip are attached at identical carbon atoms. Therefore, as might be expected, no significant differences are found in the bond distances or angles of the thiosemicarbazone moieties of H 2 2 Plpip has an angle of 58.00(6)°between the rms planes of its thiosemicarbazone moieties, and their angle with the rms plane of the pyridyl rings is 24.79(12)°and 21.00(12)°.…”

Section: Crystal Structure Of [H 2 Pgpip]mentioning

confidence: 89%

Untitled

et al. 2000

Z. anorg. allg. Chem.

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Pyridyl bis(N(4)-substituted thiosemicarbazones), in which the substituents replacing the NH 2 group on the thiosemicarbazone moieties are piperidyl, H 2 Plpip; hexamethyleneiminyl, H 2 Plhexim; diethylamino, H 2 Pl4DE; and dipropylamino, H 2 Pl4DP, have been synthesized. These bis(thiosemicarbazones) and their nickel(II) complexes have been characterized with IR, electronic, mass, and 1 H and 13 C NMR spectra. Crystal structures have been solved for H 2 Plpip and all four nickel(II) complexes. H 2 Plpip does not possess hydrogen bonding between the thiosemicarbazone moieties, but is in the Z isomeric form with intramolecular hydrogen bonding from both thiosemicarbazone moieties to pyridine nitrogen atoms. The nickel(II) complexes possess square-planar N 2 S 2 (i. e., imine nitrogen and thiolato sulfur atoms) centers and the two pyridine ring nitrogen atoms are not coordinated.

“…In contrast to many of the previously studied fr/s{N(4)-substituted thiosemicarbazones} with re ported structures (i.e., those derived from pyruvaldehyde [13], 1-phenylglyoxal [14 -16] and 1 -phenyl-1,2-propanedione [14,17]), the two thiosemicarbazone moieties of ^Plhexim are at tached to identical carbon centers. Therefore, as might be expected, H2Plhexim does not have signifi cant differences in bond distances or angles between the thiosemicarbazone moieties (Tables 3 and 4); the SI-Cl 7 and S2-C27 bond distances, 1.676(4) and 1.658(4) A, respectively, show the largest dif ference.…”

Section: Crystal Structure Of H2plheximmentioning

confidence: 95%

Structural and Spectral Studies of Palladium (II) Complexes of Pyridil bis{3-Piperidyl-, bis{Hexamethyleneiminyl-, bis{N(4)-Diethyl- and bis{N(4)-Dipropylthiosemicarbazone}

Zeitschrift Für Naturforschung B

et al. 2000

Self Cite

Pyridil bis{N(4)-substituted thiosemicarbazones}, in which the substituents replacing the NH2 group on the thiosemicarbazone moieties are piperidyl, H2Plpip; hexamethyleneiminyl, H2Plhexim; diethylamino, H2Pl4DE; and dipropylamino, H2PI4 DP, have been synthesized. Representative palladium(II) complexes of these bis (thiosemicarbazones) have been characterized by IR, electronic, mass, and 1H and 13C NMR spectroscopy. Crystal structures have been determined for H2Plhexim and two of its palladium(II) complexes. H2Plhexim is in the Z isomeric form with intramolecular hydrogen bonding from both thiosemicarbazone moieties to pyridine nitrogens. [Pd(Plhexim)] has square-planar N2S2 coordination (i.e., imine nitrogen and thiolato sulfur atoms). [Pd2 (Plhexim)Cl2 · DMSO has two PdNNSCl centers with the pyridine nitrogen, imine nitrogen or hydrazinic nitrogen and thiolato sulfur atoms coordinated