TY - JOUR
T1 - A copper(II)-pyrazole complex cation with 3̄ imposed symmetry
AU - Otieno, Tom
AU - Blanton, Jaime R.
AU - Hatfield, M. Jason
AU - Asher, Sherry L.
AU - Parkin, Sean
PY - 2002/3
Y1 - 2002/3
N2 - The reaction of Cu(ClO4)2·6H2O, NaAsF6 and excess pyrazole yields hexakis(pyrazole-κN2)copper(II) bis(hexafluoroarsenate), [Cu(C3H4N2)6] (AsF6)2 or [Cu(pzH)6](AsF6)2 (pzH is pyrazole), (I). The analogous hexakis(pyrazole-κN2)copper(II) hexafluorophosphate perchlorate complex, [Cu(C3H4N2)6] (PF6)1.29(ClO4)0.71 or [Cu(pzH)6](PF6)1.29 (ClO4)0.71, (II), is obtained in a similar fashion, using KPF6 in place of NaAsF6. Both compounds contain the hitherto unknown [Cu(pzH)6]2+ complex cation, in which the copper(II) ion lies at the center of a regular octahedron of coordinated N atoms. The cation has crystallographically imposed 3̄ symmetry. The X-ray data indicate that the lack of the expected distortion can be accounted for by the presence of either static Jahn-Teller disorder or dynamic Jahn-Teller distortion.
AB - The reaction of Cu(ClO4)2·6H2O, NaAsF6 and excess pyrazole yields hexakis(pyrazole-κN2)copper(II) bis(hexafluoroarsenate), [Cu(C3H4N2)6] (AsF6)2 or [Cu(pzH)6](AsF6)2 (pzH is pyrazole), (I). The analogous hexakis(pyrazole-κN2)copper(II) hexafluorophosphate perchlorate complex, [Cu(C3H4N2)6] (PF6)1.29(ClO4)0.71 or [Cu(pzH)6](PF6)1.29 (ClO4)0.71, (II), is obtained in a similar fashion, using KPF6 in place of NaAsF6. Both compounds contain the hitherto unknown [Cu(pzH)6]2+ complex cation, in which the copper(II) ion lies at the center of a regular octahedron of coordinated N atoms. The cation has crystallographically imposed 3̄ symmetry. The X-ray data indicate that the lack of the expected distortion can be accounted for by the presence of either static Jahn-Teller disorder or dynamic Jahn-Teller distortion.
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U2 - 10.1107/S010827010200152X
DO - 10.1107/S010827010200152X
M3 - Article
C2 - 11870296
AN - SCOPUS:0036502205
SN - 0108-2701
VL - 58
SP - m182-m185
JO - Acta Crystallographica Section C: Crystal Structure Communications
JF - Acta Crystallographica Section C: Crystal Structure Communications
IS - 3
ER -