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Construction of mononuclear macrocyclic and dinuclear acyclic Schiff base complexes via cadmium(II)–ion template: Synthesis, characterisation, and crystal structures.
- Source :
-
Inorganica Chimica Acta . Mar2018, Vol. 473, p194-203. 10p. - Publication Year :
- 2018
-
Abstract
- Using a metal template approach a series of mono and dinuclear cadmium(II) were synthesized by Schiff base condensation of a pendant armed dialdehyde, i.e. 2-[3-(2-formylphenoxy)-2-hydroxypropoxy] benzaldehyde (PL) with selection of different diamines, diethylenetriamine, dipropylenetriamine, 1,2-diaminopropane and 1,2-diaminoethane. Depending on the nature of the diaminoalkane spacers and metal ion, 1:1 (metal:ligand) macrocyclic (L1OH and L2OH) or 2:1 (metal:ligand) acylic (L3O − and L4O − ) complexes of cadmium(II) were obtained. With the longer spacers diethylenetriamine and dipropylenetriamine ring closure around the cadmium ion was observed and [1+1] macrocyclic Schiff base ligands (L1OH and L2OH) were formed. With the shorter spacers 1,2-diaminopropane and 1,2-diaminoethane ring closure was not observed. Interestingly, the dialdehyde PL reacted with two molecules of diamine, forming intermediate product acyclic Schiff base [1+2] ligands (L3O − and L4O − ) that are coordinated to two cadmium ions to form dinuclear complexes. Crystal structures indicated that the complex [CdL1(NO 3 )]. NO 3 contains a hexadentate macrocyclic ligand and a bidentate NO 3 − anion with an eight-coordinated cadmium in distorted dodecahedron geometry. The molecular structures of the complexes [Cd 2 (L3O)(NO 3 ) 3 (H 2 O)] and [Cd 2 (L4O)(NO 3 ) 3 ], on the other hand, exhibit of two seven-coordinated cadmium centers, which are bridged by the deprotonated hydroxyl group. The coordination geometries of the cadmium ions can be described as a capped trigonal prism and/or capped octahedron. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00201693
- Volume :
- 473
- Database :
- Academic Search Index
- Journal :
- Inorganica Chimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 128302920
- Full Text :
- https://doi.org/10.1016/j.ica.2017.11.064