Michael Veith, Tatjana Kirs, Bernd Morgenstern, Volker Huch
{"title":"以卤化物、酰胺和氢化物作为铝的进一步配体的哌啶烷结构研究","authors":"Michael Veith, Tatjana Kirs, Bernd Morgenstern, Volker Huch","doi":"10.1002/zaac.202400090","DOIUrl":null,"url":null,"abstract":"Nine different derivatives of piperidino alanes of the general formula (CH2)5N‐AlXY [X=Y= Cl (1), Br (2), I (3); X= (CH2)5N, Y= Cl (4), Br (5), I (6); X=H, Y= Cl (7), Br (8), I (9)] have been synthesized and compared with respect to their structures. All molecules form dimers with an Al2N2 central cycle and aluminum and nitrogen atoms in distorted tetrahedral environments as determined from X‐ray diffraction. The three dihalide derivatives 1, 2 and 3 have C2h (2/m) symmetries in solution of which they maintain the Centro symmetry in the crystal lattice. The bis(piperidino) derivatives 4, 5 and 6 have either C1 (1) symmetry with the bridging piperidino cycles oriented in the same direction (4, 5) or Ci (ī) point symmetry as found for 6 (in solution at least one other isomer is present). Whereas the chlorine derivative 7 has crystallographic Ci (ī) symmetry, the bromine 8 has almost C2 and the iodine 9 crystallographic C2 (2) point symmetry. In solution all derivatives 7, 8, 9 show equilibria between cis (C2) and trans (Ci) isomeric forms (27Al NMR). The longest Al‐N bond lengths within the rings are found for 5 (1.969(4) Å) and the shortest for 8 (1.940(4) Å).","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Structural Studies of Piperidino‐Alanes with Halide, Amide and Hydride as further Ligands at Aluminum\",\"authors\":\"Michael Veith, Tatjana Kirs, Bernd Morgenstern, Volker Huch\",\"doi\":\"10.1002/zaac.202400090\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Nine different derivatives of piperidino alanes of the general formula (CH2)5N‐AlXY [X=Y= Cl (1), Br (2), I (3); X= (CH2)5N, Y= Cl (4), Br (5), I (6); X=H, Y= Cl (7), Br (8), I (9)] have been synthesized and compared with respect to their structures. All molecules form dimers with an Al2N2 central cycle and aluminum and nitrogen atoms in distorted tetrahedral environments as determined from X‐ray diffraction. The three dihalide derivatives 1, 2 and 3 have C2h (2/m) symmetries in solution of which they maintain the Centro symmetry in the crystal lattice. The bis(piperidino) derivatives 4, 5 and 6 have either C1 (1) symmetry with the bridging piperidino cycles oriented in the same direction (4, 5) or Ci (ī) point symmetry as found for 6 (in solution at least one other isomer is present). Whereas the chlorine derivative 7 has crystallographic Ci (ī) symmetry, the bromine 8 has almost C2 and the iodine 9 crystallographic C2 (2) point symmetry. In solution all derivatives 7, 8, 9 show equilibria between cis (C2) and trans (Ci) isomeric forms (27Al NMR). The longest Al‐N bond lengths within the rings are found for 5 (1.969(4) Å) and the shortest for 8 (1.940(4) Å).\",\"PeriodicalId\":23934,\"journal\":{\"name\":\"Zeitschrift für anorganische und allgemeine Chemie\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-07-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Zeitschrift für anorganische und allgemeine Chemie\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1002/zaac.202400090\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeitschrift für anorganische und allgemeine Chemie","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/zaac.202400090","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Structural Studies of Piperidino‐Alanes with Halide, Amide and Hydride as further Ligands at Aluminum
Nine different derivatives of piperidino alanes of the general formula (CH2)5N‐AlXY [X=Y= Cl (1), Br (2), I (3); X= (CH2)5N, Y= Cl (4), Br (5), I (6); X=H, Y= Cl (7), Br (8), I (9)] have been synthesized and compared with respect to their structures. All molecules form dimers with an Al2N2 central cycle and aluminum and nitrogen atoms in distorted tetrahedral environments as determined from X‐ray diffraction. The three dihalide derivatives 1, 2 and 3 have C2h (2/m) symmetries in solution of which they maintain the Centro symmetry in the crystal lattice. The bis(piperidino) derivatives 4, 5 and 6 have either C1 (1) symmetry with the bridging piperidino cycles oriented in the same direction (4, 5) or Ci (ī) point symmetry as found for 6 (in solution at least one other isomer is present). Whereas the chlorine derivative 7 has crystallographic Ci (ī) symmetry, the bromine 8 has almost C2 and the iodine 9 crystallographic C2 (2) point symmetry. In solution all derivatives 7, 8, 9 show equilibria between cis (C2) and trans (Ci) isomeric forms (27Al NMR). The longest Al‐N bond lengths within the rings are found for 5 (1.969(4) Å) and the shortest for 8 (1.940(4) Å).