Showing papers by "Salah S. Massoud published in 1994"
261 citations
TL;DR: In this paper, a series of pseudo octahedral monoazido-, diazido- and triazido-amine-cobalt(III) complexes was synthesized and the IR spectra for the CH2 rocking in the range 800-900 cm−1 was used to distinguish between the geometrical configuration of the complexes.
27 citations
TL;DR: In this article, the initial dephosphorylation rates for preformed N 4 CoATP − chelates (1 mM) have been determined in the presence of added aqua-amine-cobalt(III) complexes N n Co III (aq) (N n = trpn, dpt, cyclen, tn 2 ) over the pH range 4-9 (25°C, I = 0.1 M).
18 citations
TL;DR: In this article, a series of cis and trans octahedral cobalt(III) complexes of the general formula [Co(3,2,3tet)XY] +/3+ have been synthesized, together with some other new members, where XY = Cl 2, Br 2, (NO 2 ) 2, (N 3 ) 2), (CN) 2, OCN), (SCN) 2, NH 3 ), etc.
14 citations
TL;DR: In this paper, the authors studied the aquation of carbonatotetraaminecobalt(III) ions in aqueous 1.0 M HClO 4 /NaClO4.
8 citations
TL;DR: In this paper, a total of 2825 data points were collected over the range of 4°2θ≤50°; of these, 1855 (independent and withI≥3σ(I)) were used in the structural analysis.
Abstract: [Cr(en)2CO3]I (I), ICoO3N4C5H16, crystallizes from water at 21°C in space groupP21/c (no. 14), with lattice constantsa=7.298(4),b=8.622(8),c=17.577(6)A,β=91.29(4)°;V=1105.59 A3 andd(calc; MW=359.11, Z=4)=2.157 g cm−3. A total of 2825 data points were collected over the range of 4°≤2θ≤50°; of these, 1855 (independent and withI≥3σ(I)) were used in the structural analysis. Data were corrected for absorption (μ=37.657 cm−1) and the transmission coefficients ranged from 0.4850 to 0.9991. The finalR(F) andR
w(F) residuals were, respectively 0.134 and 0.113. The cations exist in the lattice as the enantiomeric pair Λ(δδ) and Δ(λλ). NH4{[cis-β-Co(trien)CO3]2}(PF6)3 (II), Co2P3F18O6N9C14H40, crystallizes from water at 21 °C in space groupP21/c (no. 14), with lattice constantsa=10.397(2),b=20.292(3),c= 27.082(4) A,β=100.30(3)°;V=3545.70 A3 andd(calc; MW=983.29, Z=4)=1.842 g cm−3. A total of 3724 data were collected over the range of 4°≤2θ≤50°; of these, 2653 (independent and withI≥3σ(I)) were used in the structural analysis. Data were corrected for absorption (μ=12.031 cm−1) and the transmission coefficients ranged from 0.8326 to 0.99985. The finalR(F) andR
w
(F) residuals were, respectively 0.104 and 0.124. The cations exist in the asymmetric unit asΛ(δδδ) andΔ(λδλ)[cis-β-Co(trien)CO3]+ pairs. The three independent PF6
− anions exhibit the usual high thermal motion typical of these species and the NH4
+ cation is either disordered or exhibits high thermal motion also (its H atoms could not be found in difference maps).
4 citations
TL;DR: In this paper, the NiL2·2H2O chelates with planar arrangement around the nickel(II) ion (β-series) were derived based on IR and IV spectral data trans-geometry.
4 citations