Radiochemistry in chemistry and chemistry related undergraduate programmes in Argentina

Summary The evolution of education in Argentina at the university level is described. The detailed search of the educational offer shows that less than half of the universities (35 out of 92) include chemistry and chemistry related undergraduate programmes in their curriculum. The revision of the position of radiochemistry in these programmes reveals that only seven courses on radiochemistry are currently offered. Radiochemistry is included only in few programmes in chemistry and biochemistry. With respect to the programmes in chemical engineering the situation is worse. This offer is strongly concentrated in Buenos Aires and its surroundings.     

Aesthetics in chemistry

This highlight article invites supramolecular chemists to read the recent paper of Joachim Schummer on the origin of molecular nanotechnology.     

From supramolecular chemistry towards constitutional dynamic chemistry and adaptive chemistry

Supramolecular chemistry has developed over the last forty years as chemistry beyond the molecule. Starting with the investigation of the basis of molecular recognition, it has explored the implementation of molecular information in the programming of chemical systems towards self-organisation processes, that may occur either on the basis of design or with selection of their components. Supramolecular entities are by nature constitutionally dynamic by virtue of the lability of non-covalent interactions. Importing such features into molecular chemistry, through the introduction of reversible bonds into molecules, leads to the emergence of a constitutional dynamic chemistry, covering both the molecular and supramolecular levels. It considers chemical objects and systems capable of responding to external solicitations by modification of their constitution through component exchange or reorganisation. It thus opens the way towards an adaptive and evolutive chemistry, a further step towards the chemistry of complex matter.     

六配位磷化学和生命化学

氨基酸侧链作为调节N-磷酸基氨基酸的化学反应性时供给设备而起作用, 这一调节作用是通过磷酰基的参与而实现。     

Merging organometallic chemistry with polyoxometalate chemistry

A series of polyoxomolybdate-incorporated organometallic complexes has been obtained by reaction of [MBr(CO)5] or solvated M(CO)3+ ions (M = Mn or Br) with (nBu4N)2[Mo2O7] in methanol, sometimes in the presence of triols of the type RC(CH2OH)3 (R = Me or CH2OH). Their molecular structures are related to those of previously described polyoxoalkoxomolybdates through the formal replacement of fac-MoO2(OR)+ units by topologically equivalent fac-M(CO)3+ units. Representative pairs of structurally related clusters include [Mo2O6(OMe)4-Re(CO)32]2- and [Mo4O10(OMe)6]2-, [Mo2O4MeC(CH2O)32Mn(CO)3]- and [Mo3O6(OMe)MeC(CH2O)32]-, [Mo2O4HOCH2C(CH2O)32Mn(CO)32] and [Mo4O8(OEt)2MeC(CH2O)32], [Mo6O16(OMe)2MeC(CH2O)32-Mn(CO)32]2- and [Mo8O20(OMe)4-MeC(CH2O)32]2-. Although the frameworks of the majority of derivatives are based on tetranuclear units which display the common rhomb-like structure, the alternative cubane-type arrangement is observed in [Mo2O5(OMe)5M(CO)32]-.     

Deterministic chaos in chemistry

The characteristics of chaotic processes in chemical systems and the manner in which these processes differ from other irregularly oscillatory phenomena, in particular, stochastic noise, are studied. The basic definitions and concepts employed for describing chaotic states are given, and quantitative characteristics of deterministic chaos are examined. Most redox reactions occurring in solutions in the chaotic regime are analyzed.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 28, Nos. 5–6, pp. 382–399, September–December, 1992.     

Negative pions in chemistry

Measuring the probability of pion capture by hydrogen provides information on the properties of the chemical bond of hydrogen in molecules, in particular, on the electron density near the protons. This is shown in studies of the temperature dependence of pion capture in hydrogen-bonded liquids, of the influence of electronegative groups on the hydrogen atom in simple organic molecules, and of the effect of coordination on water molecules in aquacomplexes and aqueous solutions.