Water building-block approach

Anslyn et al. reported the formation of the water-soluble homoazacalix[4]arene analogue 90 in a reasonable yield (40 %) from a two-building block approach with... 

Various covalent and non-covalent approaches for the incorporation of fullerene building blocks into liquid crystalline mesomorphic materials have been developed [35]. Lyotropic mesophases (buckysomes) were obtained upon dissolving globular amphiphilic fullerene dendrimers in water [145]. 

Herein we wish to report another approach, namely the use of the coordination complexes and bulky organosulfonate counter anions as building blocks, to generate porous ionic network which intercalates 1,10-phenanthroline or water guest molecules. The structures of adduct [Co(trien)(phen)](l,5NDS), 5 (phen)2 (H20)8 (1) and... 

With a supermolecule approach, Bock et al. studied the first and second shell of water molecules surrounding various metal ions. They studied M (H20)i8 clusters using parameter-free density-functional calculations and trying to optimize the structures in largely unbiased calculations. Due to the size of the system (55 atoms, or 19 building blocks when assuming that the H2O units stay intact), this is a far from trivial endeavour (see, e.g., ref 2). 

Fu et al. [131] prepared MCM-41 aluminosilicates using the two-step approach described earlier [68]. They first prepared well defined aluminosilicate polyanions AljjSig., (0H)j02( j5 (0 < X < 4) oligomers to be used as precursors. These precursors were then precipitated with CjgTMABr and treated with water vapor at 110 °C for 3 days. This method not only affords MCM-41 aluminosilicates with variable Si/Al ratios down to the lowest possible ratio of 1/1, but it offers additional flexibility in the design of new materials by using suitable building blocks. 

Weak interaction potentials can be constructed specihc to a single system, such as the dimer of two molecules of water or the trimer of hydrogen huoride. They may contain terms that correspond to the usual contributing elements and may incorporate cooperative effects. In any case, the objective is a potential that is expressed in terms of geometrical parameters of the specihc system as a whole. The alternative approach is to construct potentials with parameters tied to the molecule building blocks. This alternate approach imposes a type of constraint in that functional forms used to represent a surface must rehect the types of parameters. The contributing element of permanent moment interactions is... 

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