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The coordination environments about all of the d9 Cu2+ ions are the best considered as ¡®4+2¡¯ [CuO4N2] Jahn-Teller distorted octahedral [12]. The N(1), N(2), O(2) and O(3) occupy the equatorial positions, whereas O(1) and O(7) occupy the axial positions. The four equatorial atoms around the copper atom are almost square planar with maximum deviations from the O(2), N(1), O(3) and N(2) mean planes of -0.1421(10)o at O(2) and -0.1436(10)o at O(3). The Cu(1)¨CN(1) and Cu(1)¨CN(2) distances are 2.0499(18) Å and 2.0487(17) Å2.0499(18) Å, respectively (see Table 2). The axial Cu(1)-O(1) distance of 2.2178(17) Å is significantly longer than the equatorial Cu(1)-O(2) and Cu(1)-O(3) distances of 1.9815(18) Å and 1.9640(19) Å, respectively. The shorter Cu(1)-O(1) bonds located in the cis position relative to the Cu(1)-O(7) bond of 2.668(2) Å is attributed to the Jahn-Teller effect. This value is slightly shorter than that of 2.688(2) Å found in previous work [4]. The Jahn-Teller effect gives a long coordinating S-O bond compared to the terminal S-O bonds of the pendant sulfate anion. This sulfate group acts as a monodentate ligand in which sulfur atom of the sulfate anion is approximately tetrahedral geometry. Its bond lengths and angles are within the range of values found in another similar sulfate anion compounds and previous reports [4,5,10].
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