Metallat‐Ionen [Al(OR)4]— als Chelatliganden für Übergangsmetall‐Kationen |
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| Authors: | Jochen Pauls Effat Iravani Peter Khl Bernhard Neumüller |
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| Institution: | Jochen Pauls,Effat Iravani,Peter Köhl,Bernhard Neumüller |
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| Abstract: | Metalat Ions Al(OR)4]— as Chelating Ligands for Transition Metal Cations Waterfree CoCl2 can be reacted with {Li(Diglyme)}{Al(OtBu)4}] in THF to the complex Li(THF)4]{CoCl2}{Al(OtBu)4}]. Addition of diglyme to the reaction mixtures gives the blue compound Li(diglyme)2]{CoCl2}{Al(OtBu)4}] ( 1 ). According to this procedure the FeII complex Li(Diglyme)2]{FeCl2}2{Al(OtBu)4}] ( 2 ) was formed by treatment of FeCl2 with LiAl(OtBu)4]. {Li(diglyme)}{Al(OtBu)4}] in THF/diglyme can be used as alkoxide transfer reagent on TiCl4 to give the neutral complex TiCl2(OtBu)2(diglyme)] ( 3 ). The sky‐blue salt Li(THF)4]2{CoCl2}3{Al(OCH2Ph)4}2] ( 4 ) was obtained by reaction of LiAl(OCH2Ph)4] with CoCl2 in THF. By treatment of 4 with diglyme ligand redistribution was observed giving the sky‐blue compound Li(Diglyme)2]2{CoCl2}3{Al(OCH2Ph)4}2] ( 5 ) and the violet salt Li(Diglyme)2]2Co2Cl5(OCH2Ph)] ( 6 ). A similar salt can be synthesized also directly from LiAl(OtBu)4] and CoCl2 in diglyme to give Li(Diglyme)2]2Co2Cl5(OtBu)] ( 7 ). 1 — 7 were characterized by IR spectroscopy, partly by mass spectrometry and X‐ray analyses. UV‐VIS spectra were recorded from 1 and 5 . According to the X‐ray analyses the MII ions as well as the AlIII ions are coordinated distorted tedrahedrally. In 1 , 2 , 4 und 5 the unit Al(OR)4]— acts a chelating ligand as desired. |
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| Keywords: | Alkoxo aluminates Cobalt Iron Titan Crystal structures |
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