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The crystal structures of N,N¢-dimethyl-N,N¢-bis(pyridin-2ylmethyl)propane-1,3-diaminecopper(II) perchlorate ([Cu(ClO4)2(LMe2)]) and isothiocyanato-N,N¢-dimethyl-N,N¢bis(pyridin-2-ylmethyl)propane-1,3-diaminecopper(II) perchlorate ([Cu(NCS)(LMe2)]ClO4) have been reported. Each of the N-methyl groups is placed at a transand a cisconfiguration for [Cu(ClO4)2(LMe2)] and [Cu(NCS)(LMe2)]ClO4, respectively. When the two N-methyl groups were replaced at two N-ethyl groups, each of the N-ethyl groups for isothiocyanato-N,N¢-diethyl-N,N¢-bis(pyridin-2-ylmethyl)propane-1,3-diaminecopper(II) perchlorate ([Cu(NCS)(LEt2)] ClO4) was placed at the cis-configuration.3 This would be one reason why a small distortion of the complex coordinated LMe2 or LEt2 and isothiocyanate or perchlorate ion to Cu(II) is more preferable to a large one. Therefore, the different configuration of N-alkyl groups, such as N-methyl and N-ethyl groups, depending on the distortion for analogous Cu(II) complexes, is interesting. The strong coordinating isothiocyanate ion to those Cu(II) complexes might cause the cis-configuration for the N-alkyl groups, while the weak coordinating perchlorate ion might cause the trans-configuration for them. Therefore, a crystal structure of the analogous Cu(II) complex, catena-(m2pechlorato)-N-ethyl-N,N¢-bis(pyridin-2-ylmethyl)propane-1,3diaminecopper(II) perchlorate ([Cu(ClO4)2(LHEt)]), was determined in this work, since its crystal structure has not yet been reported. N,N¢-Bis(pyridin-2-ylmethyl)propane-1,3-diamine (LH2) was prepared and purified according to published preparation methods.2,4 The ligand LHEt was prepared by refluxing a X-ray Structure Analysis Online

x-ray structure analysis online

Crystal Structure of &lt;i&gt;Catena&lt;/i&gt;-(&lt;i&gt;μ&lt;/i&gt;&lt;sub&gt;2&lt;/sub&gt;-perchlorato)-&lt;i&gt;N&lt;/i&gt;-ethyl-&lt;i&gt;N&lt;/i&gt;,&lt;i&gt;N&lt;/i&gt;′-bis(pyridin-2-ylmethyl)propane-1,3-diaminecopper(II) Perchlorate