Lead puzzle

The moments of complexes containing NO offer a puzzling problem. The diamagnetism of compounds of iron and ruthenium suggests that Feiv and RuIV form a double bond with NO, making seven bonds in all, which woud lead to /t = 0. But this structure cannot be applied to [Co(NH3)6-NO]Cl2, which has a moment corresponding to a triplet state. Further study of such complexes is needed. 

Both effects of the two strategies are visualised in Fig. 2.4. Incoherency between the substractures of the curriculum is illustrated by those pieces of the jig-saw puzzle that do not fit together. The sedimentary layers, the accumulation of chemical theory, and subsequent curriculum overload are visualised with the layers of the substantive substracture that leads to a huge outgrowth. 

Second, it is important to ask whether the expected corrections to the strict semiclassical theory lead to observable consequences. In what follows, we provide approximate arguments that indeed such corrections are discernible and may even potentially answer some longstanding puzzles in this field. 

On the other hand, the undamped autocorrelation function (17) we have obtained within the standard approach avoiding the adiabatic approximation must lead after Fourier transform to spectral densities involving very puzzling Dirac delta peaks given by... 

As a consequence of the wide frequency range over which Fermi resonances may be effective, let us conclude that, in practical situations, several Fermi couplings may be involved in a spectrum, which must lead to puzzling spectral lineshapes. 

One of the key experimental results leading to the elucidation of this overall structural puzzle involved depolarized reflected light microscopy (DRLM) studies on NOBOW freely suspended films in the high-temperature SmCP phase.48 In the freely suspended films it appears that only one phase is observed, which is assumed to be the phase forming the majority domains in the EO cells. The DRLM experiment provides two key results. First, thin films of any layer number have a uniformly tilted optic axis, suggesting all of the layer interfaces are synclinic. Second, films of even-layer number are nonpolar, while films of odd-layer number are polar, with the polar axis oriented normal to the plane of the director tilt (lateral polarization). 

A careful inspection of several examples [51-54] leads to the conclusion that the O-coordination is produced trans to a soft (C or P) atom, while C-coordi-nation mainly occurs trans to a harder (N) atom. Complex (12) is the paradigm of this selectivity on bonding modes and sites [53] the C-bonded yhde is found trans to the N atom while the N-bonded ylide is trans to the paUadated C atom. In spite of this puzzling appearance (Scheme 5), the consideration of the nature of the donor atoms and the antisymbiotic behavior of the Pd center [55] provides a sensible explanation of the observed reactivity [21]. 

The Marques de Aranda had the government turn over its entire supply of platinum to Chabaneau for his difficult and puzzling researches. When Chabaneau removed the gold, mercury, lead, copper, iron, etc., he thought he had a single metal, platinum. As a matter of fact, however, he was still dealing with six metals, for rhodium, palladium,... 

For many years. Dr. Pickover was the lead columnist for Discover magazine s Brain-Boggler column, and he currently writes the Brain-Strain column for Odyssey. His puzzle calendars and cards are designed for both children and adults and have sold hundreds of thousands of copies. 

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