Cubane properties

Summary of the Ground-State Properties of Representative Examples of Synthetic Single AND Double Cubanes Containing [MFejSJ Clusters and Rationalization in Terms of the... 

Pasture land and railroad rights of ways in connection with sugar cane operations offer additional opportunities for the use of herbicides. On one property of 100,000 acres, over 300 miles of permanent railway are maintained. Roughly half of this right of way receives one or more applications of a 2,4-D and TCA mixture each year the rest is burned. A cheap, nonpoisonous soil sterilant is indicated. All Cuban plantations have their own rail systems with similar problems, but permanent rail transportation is less common in other areas. 

The latter are generally obtained as dimeric "double cubanes", which must be cleaved to produce the single cubane clusters. The preparation and properties of both linear (51,71,72) and cubane (51,71) Mo-Fe-S clusters have been reviewed in detail, and will not be discussed further here. 

Use of the tripodal ligand Saltren creates a tetranuclear complex [Mn402(Sal-tren)2][MnCl4] 2CH3CN (172) having a fused open cubane structure without a carboxylate group. At 300 K the value of the effective magnetic moment for (172) is 5.1 /Ub, which decreases to 2.0 /iB at 4.2 K. The redox properties of (172) in propylene carbonate have been studied by cyclic voltammetry. Two oxidation responses are observed at = —0.32V and 0.43 V vs. SCE. 

Almost all tests carried out to study the starting process of atmospheric corrosion have been performed in a surface without corrosion products however, in real conditions, the metal is covered with corrosion products after a given time and these products begin to play its role as retarders of the corrosion process in almost all cases. Corrosion products acts as a barrier for oxygen and contaminants diffusion, the free area for the occurrence of the corrosion is lower however, the formation of the surface electrolyte is enhanced. Only in very polluted areas the corrosion products accelerate the corrosion process. Water adsorption isoterms were determined to corrosion products formed in Cuban natural atmospheres[21]. Sorption properties of corrosion products (taking into account their salt content-usually hygroscopics) determine the possibilities of surface adsorption and the possibility of development of corrosion process... 

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