The synthesis and the X-ray structure of the two pseudotetrahedral Zn(II) zwitterionic complexes: trichloro(1-methylpiperazin-1-ium-N4)zinc(II). [ZnCl3(H,Meppz)], and trichloro(1,4-dimethylpiperazin-1-ium-N4)zinc (II). [ZnCl3(HMe2ppz)], are described [(H2Meppz)+ = 1-methylpiperazin-1- ium monocation and (HMe2ppz)+ 1,4-dimethylpiperazin-1-ium monocation], [ZnCl3(H2Meppz)] and [ZnCl3(HMe2ppz)] complexes ave isomorphous and isostructural, respectively, to the [CoCl3(H2Meppz)] and [C0Cl3(HMe2ppz)] complexes. already reported in Iiterature by us. Both complexes present a very uncommon and distorted tetrahedral aminotrichlorozinc(II), NZnCl3, group, where N is a nitrogen atom of an aliphatic amine. So far this group has been found only in the (1,3,5,7-tetraazaadamantane)trichloro-zincate (II) anion [{(CH2)6N4}ZnCI3]. The bulky ZnCI3 group present in [ZnCl3 (HMe2ppz)], is coordinated to the axial position of the piperazine ring instead of the less hindered equatorial position, as found in the analogous [C0Cl3(HMe2ppz)] complex. An extended hydrogen bond network is present in the crystals of both the complexes but, while the [ZnCl3 (H2Meppz)] complex shows nearly Iinear N+...Cl intermolecular hydrogen bonds, the [ZnCl3(HMe2ppz)] complex shows a perfectly symmetrical (imposed by space group symmetry) ZnNCl three-centre intermolecular hydrogen bond. The solid state infrared spectra of both the compounds are discussed in agreement with the hydrogen bond network present in the crystals.
Synthesis, crystal and molecular structure of pseudotetrahedral Zn(II) zwittenonic complexes: trichloro( i -methylpiperazin.- i -ium-N4)zinc(II) and trichloro( i , 4-dimethylpiperazin- i -ium-N4)zinc(II)
2002
Abstract
The synthesis and the X-ray structure of the two pseudotetrahedral Zn(II) zwitterionic complexes: trichloro(1-methylpiperazin-1-ium-N4)zinc(II). [ZnCl3(H,Meppz)], and trichloro(1,4-dimethylpiperazin-1-ium-N4)zinc (II). [ZnCl3(HMe2ppz)], are described [(H2Meppz)+ = 1-methylpiperazin-1- ium monocation and (HMe2ppz)+ 1,4-dimethylpiperazin-1-ium monocation], [ZnCl3(H2Meppz)] and [ZnCl3(HMe2ppz)] complexes ave isomorphous and isostructural, respectively, to the [CoCl3(H2Meppz)] and [C0Cl3(HMe2ppz)] complexes. already reported in Iiterature by us. Both complexes present a very uncommon and distorted tetrahedral aminotrichlorozinc(II), NZnCl3, group, where N is a nitrogen atom of an aliphatic amine. So far this group has been found only in the (1,3,5,7-tetraazaadamantane)trichloro-zincate (II) anion [{(CH2)6N4}ZnCI3]. The bulky ZnCI3 group present in [ZnCl3 (HMe2ppz)], is coordinated to the axial position of the piperazine ring instead of the less hindered equatorial position, as found in the analogous [C0Cl3(HMe2ppz)] complex. An extended hydrogen bond network is present in the crystals of both the complexes but, while the [ZnCl3 (H2Meppz)] complex shows nearly Iinear N+...Cl intermolecular hydrogen bonds, the [ZnCl3(HMe2ppz)] complex shows a perfectly symmetrical (imposed by space group symmetry) ZnNCl three-centre intermolecular hydrogen bond. The solid state infrared spectra of both the compounds are discussed in agreement with the hydrogen bond network present in the crystals.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
