Syntheses and x-ray structures of group 11 pyrazole and pyrazolate complexes. X-ray crystal structures of bis(3,5-diphenylpyrazole)copper(II) dibromide, tris(.mu.-3,5-diphenylpyrazolato-N,N')trisilver(I)-2-tetrahydrofuran, tris(.mu.-3,5-diphenylpyrazolato-N,N')trigold(I), and hexakis(.mu.-3,5-diphenylpyrazolato-N,N')hexagold(I)

A Hexameric Cationic Copper(II) Metallacrown as a Pertechnetate and Perrhenate Scavenger

“…Comparison of the C6ÀO1 and C6ÀN2 bond lengths in the ring with those determined in the free ligand [27] indicates single and double bond character,respectively,and this suggests predominance of the enolatef orm in the [Cu 6 (2ph) 6 ] 6 + ring. [22,29] The [18-MC-6] motif is not very common,a lthough different structures with Mn III , [30] Fe III , [31] Co III , [31] Ga III , [31] and Au I [32] have been reported. [28] The resulting cyclic structure can be described as am etallacrown [22] [18-MC Cu II -Nð2phÞ -6] 6 + with aC u ···Cu distance that gives ac avity diameter between about 9.2 and 9.7 ( Scheme 2).…”

“…A large variety of metallacrownsh ave been synthesized since the first one was reported by Pecoraro and Lah; [22b] besides the initial structural interest, properties such as antibacterial activity, stabilization of unstable molecules, molecularm agnetism, and recognitionshave been studied. [22,29] The [18-MC-6] motif is not very common,a lthough different structures with Mn III , [30] Fe III , [31] Co III , [31] Ga III , [31] and Au I [32] have been reported. One example that is more closely related with the present case is the metallacrown obtained from di-2-pyridyl ketone oxime and Cu(ClO 4 ) 2 .T his structure can be considered as being shaped like ab and andt he ClO 4 À ion is only weakly coordinated.…”

Silver Pyrazolates as Coordination‐Polymer Luminescent Metallomesogens

“…Room-temperature XRD data. anuclear gold complex with phenyl groups at the 3-and 5-positions, namely, [Au(m-3,5-Phpz)] 6 . [6] Moreover, staggered conformations with torsion angles around 908 have also been described for 1D polymeric supramolecular structures built from hydrogen bonding (catemers) of metal-free 1H-pyrazoles, [28] as found in 3-carboxymethyl-5-phenyl-1H-pyrazole.…”

“…anuclear gold complex with phenyl groups at the 3-and 5-positions, namely, [Au(m-3,5-Phpz)] 6 . [6] Moreover, staggered conformations with torsion angles around 908 have also been described for 1D polymeric supramolecular structures built from hydrogen bonding (catemers) of metal-free 1H-pyrazoles, [28] as found in 3-carboxymethyl-5-phenyl-1H-pyrazole. [29] Finally, the single-crystal structure of the only silver pyrazolate polymer described, [AgA C H T U N G T R E N N U N G (m-pz)] n , has been solved to be a helical chain in which silver is linearly coordinated by two pyrazolate ligands with N-Ag-N angles of 1708, regular pz-Ag-pz torsion angles of 1208 (that is, staggered closer to transoid conformation than to cisoid conformation), and intrachain Ag···Ag distances between 3.25 and 3.37 .…”

“…[3] In the case of substituted pyrazoles, although a tetrameric structure has been described for the complex with 3,5-di(tert-butyl)pyrazolate ligands [Ag(m-3,5-tBupz)] 4 , [5] the most common structural type is the trimeric ring structure. [6][7][8][9] The trimeric structure consists of a ninemembered Ag 3 N 6 metallacycle with a planar array of N,N'-bridging pyrazolates and linearly coordinated silver ions. These materials were recently reported to show fascinating properties as a consequence of their tunable supramolecular organization.…”