부산대학교 도서관

The reaction of AgBF4 with two equivalents of pzH (pyrazole) or dmpzH (3,5-dimethylpyrazole) leads to [Ag(pzH)2]BF4 or [Ag(dmpzH)2]BF4. The reaction of [AuCl(tht)] with an equimolar amount of dmpzH in refluxing hexane leads to [Au(dmpzH)2][AuCl2]. Similar complexes [Au(dmpzH)2]A (A = BF4 or NO3) are obtained from [AuCl(tht)], two equivalents of dmpzH, and AgBF4 or AgNO3. The complexes [Ag(dmpzH)2]BF4 and [Au(dmpzH)2]A (A = [AuCl2], BF4 or NO3) crystallize as ionic pairs where the NH groups of the pyrazoles are involved in short cation-anion interactions. The nitrate complex crystallizes as a dimer, where both molecules are supported by π-stacking interactions between the pyrazole rings. The crystal structure of [Ag(pzH)2]BF4 reveals a three dimensional array of cations and anions. In solution, [Ag(pzH)2]BF4 and [Ag(dmpzH)2]BF4 undergo intermolecular processes involving pyrazole decoordination, and behave as 1/1 electrolytes; whereas dimethylpyrazole gold complexes do not display any dynamic behavior, and show cation-anion association also in solution. [ABSTRACT FROM AUTHOR]