Anion Exchange in the Solid State

A relative selectivity toward one of the anions, which depends on the grid-complex used as the starting material, was observed in these experiments. It is interesting to compare the results of tests 2 and 3, on the one hand, and those of tests 4 and 5 on the other. These correspond to experiments in which the same cationic grid is used as the starting material but with a different counter-anion. The data are clearly different, indicating that the solid state structure of the starting material is very important in the selectivity towards a specific anion. 

Preparation of Coordination Polymers with 2,3-Pyrazolylquinoxalines or 2,3-Pyrazolylpyrazines and Cu(l) or Ag(l) 

Preparation and Characterization of Dinuclear Building Blocks and Coordination Polymers 

As the starting materials react, all of these compounds immediately precipitate from the reaction mixture and their metahligand stoichiometries are controlled by the lack of solubility. It was only possible to determine the structure of complex 102, which crystallizes with acetone and has a stoichiometric formula [Cu2(bpzqnx)2 (Me2 CO)] (BF4) 2 (Me2CO)2 . As explained below, the structure consists of unsaturated CU2L2 units, half of which contain the copper center also bonded to acetone molecules. 

To gain further information we tried to cut the polymers and isolate the dinuclear units. Thus, some of these reactions were performed with a coordinating solvent such as acetonitrile or with pyridine in an M py ratio of 1 1. We were able to obtain the dinuclear derivatives [see Eqs. (6) and (7)] that, in contrast to the preceding polymeric compounds, are relatively soluble in acetone. 

---