Abstract
Reactions of silver(I) perchlorate with tetraphenyl-cyclopentadiene (Ph 4H 2C 5) have isolated two novel silver(I) bridged tetraphenyl-pyrylium complexes: [Ag(ClO 4)(Ph 4HC 5O +)](ClO 4) − ( 1) and [ Ag ( ClO 4 ) ( H 2 O ) ( Ph 4 HC 5 O + ) ] ( ClO 4 - ) ( 2), depending on moisture-content of the reactants. Structure studies using single-crystal X-ray diffraction have showed that complex 1 contains a distorted tetrahedral metal center bridging two neighboring peripheral phenyl rings of one pyrylium cation and two perchlorate anions, whereas 2 involves a three-coordinate metal ion interacting with a pair of phenyl rings and one water molecule, leaving two perchlorate anions free from coordination. For both complexes, the precursor ligand Ph 4H 2C 5 undergoes a ring-enlargement reaction, forming a six-membered pyrylium cation. The fundamentals of the synthesis, structure characterization and some properties are discussed.
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