Synthesis and characterization of oxovanadium (IV) dithiocarbamates with pyridine

Abstract

Recebido em 19/02/01; aceito em 12/12/01 SYNTHESIS AND CHARACTERIZATION OF OXOVANADIUM (IV) DITHIOCARBAMATES WITH PYRIDINE We report the synthesis and study of a new series of oxovanadium (IV) dithiocarbamate adducts and derivatives with pyridine and cyclohexyl, di-iso-butyl, di-n-propyl, anilin, morpholin, piperidin and di-iso-propyl amines. The complexes have been characterized by analytical, magnetochemical, IR, visible-UV spectral and thermal studies, and are assigned the formulas [VO(L) 2 ].py, where L=cyclohexyl, di-iso-butyl, di-n-propyl, anilin dithiocarbamate and [VO(OH)(L)(py) 2 ]OH.H 2 O (L=morpholin, piperidin and diiso-propyl dithiocarbamate). The effect of the adduct formation on the p V=0 bound is discussed in terms of the IR (V=O, V-S and V-N stretching frequencies) and electronic spectra (d-d transitions).

Preparation and Characterization of the Adducts of Bis(N,N-diethyldithiocarbamato)oxovanadium(IV) and Copper(II) with n-Propylamine and Isopropylamine

“…The adducts of bis(diethyldithiocarbamato) oxovanadium(IV) show electronic transitions of e ← b 2 (υ 1 ) in the range 13349-13837 cm −1 , b 1 ← b 2 (υ 2 ) in the range 18021-18426 cm −1 and a 1 ← b 2 (υ 3 ) in the range 25027-25386 cm −1 . Above transitions have major contribution for distorted octahedral geometry of oxovanadium(IV) complexes which is also supported by the reported literature 19,20 . 2 show a broad band with maximum intensity centered around 16000 cm -1 which can be assigned to 2 B 1 → 2 E (υ 1 ), suggesting a square pyramidal geometry around Cu(II) ion.…”

“…The adducts of bis(N,N-diethyldithiocrbamato)VO(IV) are found to be paramagnetic having magnetic moment values of 1.82 and 1.86 B.M. These results show the existence of monomeric species of oxovanadium(IV) 19 . The higher values of magnetic moment may be attributed to the orbital contribution 20 .…”

“…In the infrared spectra of the adducts of VO(dedtc) 2 a strong band at 986-991 cm −1 is observed which can be attributed to the terminal V=O bond. The V=O band in the parent complex observed at 1000 cm −1 is displaced to lower frequencies in the adducts which is due to the electronic donation of the base to the vanadium (N→V) 19 .…”

Synthesis, Characterization and Antifungal Activities of Adducts of Bis(O-isoamyldithiocarbonato)oxovanadium(IV) with Substituted Pyridines

“…) gets displaced to lower frequencies (990-960 cm 1 ) in the adducts 19 . This displacement can be attributed to the electronic donation of the base to the vanadium (N _ V), which increases the electron density on the metal d-orbitals, and consequently the p  -d  donation from oxygen atom to vanadium is expected to be reduced.…”

Dicyclopentamethylenethiuram Disulfide as Precursor of Mononuclear Complexes: Oxidative Cleavage of Metal-Metal Bond in [CpMo(CO)<sub>3</sub>]<sub>2</sub> and Molecular Structure of <i>cis</i>-[CpMo(CO)<sub>2</sub>{S<sub>2</sub>C-N(CH<sub>2</sub>)<sub>5</sub>}]

“…Since these ligands contain nitrogen and sulfur donor atoms, they are capable of forming complexes with most of the elements [4]. A number of dithiocarbamate complexes have been reported in literature [5]- [12] with various geometries such as square planar [13], octahedral [14] [15] and trigonal prismatic [16]. Interestingly, their pyridine [6] [7] [17], 2,2'-bipyridine [7] Crystal Structure Theory and Applications [9] triphenylphosphine [18], and 1,10-phenanthroline [9] [17] adducts have been reported to possess similar donor properties.…”