Gd(III) complexes intercalated into hydroxy double salts as potential MRI contrast agents

The ion exchange intercalation of two Gd-based magnetic resonance imaging contrast agents into hydroxy double salts (HDSs) is reported. The presence of Gd3+ diethylenetriaminepentaacetate and Gd3+ diethylenetriaminepenta(methylenephosphonate) complexes in the HDS lattice after intercalation was confirmed by microwave plasma-atomic emission spectroscopy. The structural aspects of the HDS-Gd composites were studied by X-ray diffraction, with the intercalates having an interlayer spacing of 14.5–18.6 Å. Infrared spectroscopy confirmed the presence of characteristic vibration peaks associated with the Gd3+ complexes in the intercalation compounds. The proton relaxivities of the Gd3+ complex-loaded composites were 2 to 5-fold higher in longitudinal relaxivity, and up to 10-fold higher in transverse relaxivity, compared to solutions of the pure complexes. These data demonstrate that the new composites reported here are potentially potent MRI contrast agents

A second order Runge–Kutta method for the Gatheral model

In this thesis, our research focus on a weak second order stochastic Runge–Kutta method applied to a system of stochastic differential equations known as the Gatheral Model. We approximate numerical solutions to this system and investigate the rate of convergence of our method. Both call and put options are priced using Monte-Carlo simulation to investigate the order of convergence. The numerical results show that our method is consistent with the theoretical order of convergence of the Monte-Carlo simulation. However, in terms of the Runge-Kutta method, we cannot accept the consistency of our method with the theoretical order of convergence without further research

Standard enthalpies of formation of lanthanum hydroxynitrates

The standard enthalpies of solution of La(OH),NO, H,O and La(OH),NO, in HNO,(aq) have been measured calorimetrically. These results, when combined with auxiliary thermochemical values, yielded the standard enthalpies of formation of these lanthanum hydroxynitrates. The values obtained for A,Hm(cr, 298.15 K)/(kJ’mol-‘) are La(OH),NO, H,O. -(1676.6* 1.4); and La(OH),NO,. -(1390.9* 1.5).Peer reviewe

Standard enthalpies of formation of lanthanum hydroxynitrates

The standard enthalpies of solution of La(OH),NO, H,O and La(OH),NO, in HNO,(aq) have been measured calorimetrically. These results, when combined with auxiliary thermochemical values, yielded the standard enthalpies of formation of these lanthanum hydroxynitrates. The values obtained for A,Hm(cr, 298.15 K)/(kJ’mol-‘) are La(OH),NO, H,O. -(1676.6* 1.4); and La(OH),NO,. -(1390.9* 1.5).Peer reviewe

Standard enthalpies of solution and formation of β-Co2(OH)3Cl

The crystallographic properties of metal hydroxyhalides have been summarized by Oswald and Feitknecht.‘l’ The cobalt hydroxychloride Co,(OH),Cl occurs in two polymorphic modifications: a and p. At room temperature the p form is the more stable and its structure is quite similar to that of atacamite, CU,(OH),C~.‘~’ In this note, we report our studies concerning the standard enthalpy of solution of l3-Co,(OH),Cl in hydrochloric acid as well as its standard enthalpy of formation.Peer reviewe