Transition Metal. II. Complexes of Dithiacyclophanes.
Final rept. 20 Sep 82-19 Sep 85,
SOUTHERN UNIV BATON ROUGE LA DEPT OF CHEMISTRY
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This investigation is related to our recent report on the synthesis and characterization of cobalt II, copper II, and nickel II complexes of the new macrocyclic ligand, 7-oxa-2,12-dithia13 2,6pyridinopphane 1. The coordination chemistry of a series of structurally related macrocylclic ligands 1-8 was investigated. Macrocycles studied include oxa-, dioxa-, and thia- dithiapyridinophanes 2a, 2b, and 3a, respectively, oxa-, dioxa-, trioxa- and polymethylene-dithiaparacyclophanes 4a and 5, 4b and b and 2,10-dithia3.3 2,6pyridinophane 9. The pyridinophanes 2a, 2b, 3a and 9 formed stable crystalline complexes when treated with methanol solutions of cobalt II, copper II, and nickel II salts. However, cobalt II and nickel II salts did not form crystalline complexes when combined with the paracylcophanes 4, 5, and 6. Electronic spectra, electrolytic conductivities and magnetic susceptibilities data, and elemental analyses were utilized in the characterization of these complexes. Solution and solid state effective magnetic moments were identical for each complex derived from the oxapyridinophane 1, indicating that the same species exists in both phases. Overall, physical data support monomeric structures of general formula MIILX2 where MII the transition metal II cation, L macrocycle, and X halogen or thiocyanate for all complexes studies. Keywords Mixed crown ethers Coordination compounds.
- Organic Chemistry
- Atomic and Molecular Physics and Spectroscopy