Synthesis and crystal structures of copper(II) and silver(I) complexes of a semi-rigid bipyrazolyl ligand

Two semi-rigid bipyrazolyl ligands, namely 2,3,5,6-tetramethyl-1,4-bis[(3 0 ,5 0 -dimethyl-1H -pyrazol-4 0 -yl)methylene]benzene (H 2 L) and 2,3,5,6-tetramethyl-1,4-bis[(3 0 ,5 0 -diphenyl-1H -pyrazol-4 0 -yl)methylene]benzene (H 2 L 0 ), and their Ag(I) and Cu(II) complexes have been prepared and structurally characterized by means of X-ray analysis. In the structures of the metal complexes, namely [Ag 2 (H 2 L) 2 ](BF 4 ) 2 Á2H 2 O (1), [Ag(H 2 L)(NO 3 )] n (2), [Cu 2 (H 2 L) 4 (SO 4 ) 2 ]Á11H 2 O (3), and {[Ag(H 2 L 0 )]BF 4 } n (4), the bipyrazoles act as bridging ligands to connect two metal atoms. Complexes 2 and 4 exhibit 1-D polymeric structures, while 1 and 3 are discrete molecules with a rectangular dimer or tetragonal prismatic shapes, respectively. Two different conformations, namely cis and trans, have been observed for these bipyrazolyl ligands.

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“…S4). A few similar rectangular dimetallomacrocycles based on various metals and ligands are also known in the literature [6,7].…”

Section: Crystal Structure Descriptionsmentioning

confidence: 99%

“…We have recently reported the synthesis and crystal structures of a semi-rigid m-xylylene-bridged C 4 -linked bipyrazolyl ligand as well as its Ag(I) and Cu(II) complexes [6]. As one might expect, the relative orientations of the two pyrazolyl rings is a key factor to determine the structure of the metal-bipyrazole complexes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and crystal structures of silver(I) and copper(II) complexes with p-xylylene-bridged bipyrazolyl ligands

Wang

Chen

Zhao

et al. 2011

Transition Met Chem

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“…177 Cyclometallated phosphine and arsine gold(II) dimers were reacted with several bis(alkynes) to give binuclear alkynyl gold(I) complexes. 178 Syntheses and structures of dinuclear silver(I) complexes with arsine and pyridyl ligands 179 as well as bridging bipyrazol ligands 180 were reported. Cyclic phosphinimines can coordinate silver(I) and gold(I) quite similar to carbene ligands.…”

Section: Phosphine Chalcogen and Related Ligandsmentioning

confidence: 99%