Carboxylato-bridged polymeric complexes of chromium(III) with the hexadentate (卤)-1,3-pentanediamine-N,N,N鈥?N鈥?tetraacetate ligand carrying different counter ions. Stereospecific formation and crystal structures of Na[Cr(1,3-pndta)]路H₂O, K[Cr(1,3-pndta)]路H₂O and Ca[Cr(1,3-pndta)]₂路4H₂O

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• 作者：Beata War偶ajtis ; Urszula Rychlewska ; Du拧anka D. Radanovi膰 ; Ivana M. Stanojevi膰 ; Nenad S. Dra拧kovi膰 ; Niko S. Radulovi膰 ; Milo拧 I. Djuran
• 关键词：1 ; 3-Pdta-like complexes ; Chromium(III) diaminopolycarboxylates ; Ethyl substitution ; Counter ion effect ; MOFs ; Carboxylate binding to metals
• 刊名：Polyhedron
• 出版年：8 January, 2014
• 年：2014
• 卷：67
• 期：Complete
• 页码：270-278
• 全文大小：1964 K

文摘

A series of Na⁺, K⁺ and Ca²⁺ salts of chromium(III) complexes with the hexadentate (卤)-1,3-pentanediamine-N,N,N鈥?N鈥?tetraacetate (1,3-pndta) ligand was evaluated. The extent of distortion exhibited in the geometry of these octahedral complexes was computed and related to the configuration at the metal center and the ligand stereogenic center. The materials have been used to investigate the effect of the counter ion and the diamine ring substitution on the self organization and degree of hydration of these molecules in crystals. Various modes of carboxylate binding to metal atoms have been related to the formation of 3D, 2D and 1D polymeric structures. The electronic absorption and ¹H NMR spectra of 1,3-pndta-Cr(III) complexes are discussed in relation to those of 1,3-pdta-Cr(III) complex (1,3-propanediamine-N,N,N鈥?N鈥?tetraacetate ion) of known structure.