By Valery P. Kukhar, Harry R. Hudson
Aminophosphinic and aminoposphonic acids, artificial analogs to normal amino acids, have attained a place of prominence in research--particularly in learn concerning the amendment of physiological strategies in residing organisms.
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Additional info for Aminophosphonic and Aminophosphinic Acids: Chemistry and Biological Activity
The ambivalent donor or acceptor role of low-valent metal carbonyl species, such as M(CO)5 [M ¼ chromium, molybdenum, tungsten], in monometallic p-substituted pyridine (or stilbazole) complexes was investigated in detail by Kanis et al. in the early 1990s, and later by Roberto et al. 22 Δμ eg < 0 ; β < 0 The ambivalent role of metal carbonyl complexes electron-donating group D such as NR2, is dominated by an ILCT transition, with the metal centre functioning primarily as an inductive electron acceptor.
In conclusion, the NLO study of lanthanide complexes allows the electronic contribution of the central metal ion to the quadratic hyperpolarisability to be established. The discovery of the polarisable character of f-electrons, further confirmed by theoretical calculations, shows that quadratic NLO measurements can be a very sensitive tool to probe the intimate nature of the matter. 40) exhibit a non-zero hyperpolarisability in solution, clearly indicating that at least a fraction of the molecules must have a noncentrosymmetric structure.
39c,d). This result clearly indicates that the metal contribution to the NLO activity is not due to geometrical considerations but to its electronic configuration. This contribution of the f-electron to the quadratic hyperpolarisability is the signature that f-electrons are sensitive to an external electric field, hence that they are polarisable, which is in marked contrast with the generally admitted inertness of f-electrons due to their shielding by 5s2 and 5p6 shells. In conclusion, the NLO study of lanthanide complexes allows the electronic contribution of the central metal ion to the quadratic hyperpolarisability to be established.