Crystal Structure and EPR Studies of Bis[1,3-Di(p-n-Octylphenyl)Propane-1,3-Dionato]Oxovanadium(IV)
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Abstract We report here the synthesis, crystal structure and Electron Paramagnetic Resonance (EPR) studies of the compound bis[1,3-di(p-n-octylphenyl)propane-1,3-dionato]oxovanadium(IV) abbreviated as C8(VO)C8. The molecular crystalline properties of this compound are dealt with in this paper. The compound crystallizes in the triclinic, P1 space group with a = 11.956(4), b = 15.802(5), c = 16.293(4) Å, α = 103.22(2), β = 110.61(2), and γ = 90.88(3); Z=2. The two vanadium centers are crystallographically equivalent and the shortest V-V bond distance is 9.5803 Å. The hyperfine splitting pattern in single crystal EPR spectrum clearly shows the presence of weak pair-wise magnetic interaction. The splitting originates in a combination of hyperfine and fine structure caused by dipolar and exchange coupling of nearest-neighboring molecules related by inversion through the unit cell origin. The sign and the value of the exchange coupling constant, J = + 30 G, was determined by simulation of EPR spectra. The principal g and A values obtained are g| = 1.934 and g⊥ = 1.982, A| = 192 G and A⊥ = 69 G.Keywords:
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