Thioether macrocyclic complexes nickel

Interaction of [Ni(OH2)6] with 9S3 in ethanol affords the octahedral brick red [Ni(9S3)2] cation (Eq. 4a) [62], Nickel-sulfur distances (Table 1) [62] fall well short (0.06 A) of the sum of ionic radii [2, 104]. Such short Ni-S distances (compared to Ni(II) complexes of acyclic thioethers) [109,110] stem from compression induced by the macrocyclic nature of the ligand (the macrocyclic constriction effect) [16, 17, 18]. 

The assembly of the macrocyclic compound LI 845, containing azomethine and secondary amino groups as well as thioether sulphur atoms, is performed by aldol condensation. This substance is isolated as its nickel(U) complex [21, 22]. Metal-free LI845 is generated by boiling a suspension of Ni(L1845)Br2 in water (Eq. 9.14)... 

Kyba EP, Davis RE, Fox MA et al (1987) Phosphinomacrocycles. 16. Complexation of the nickel(II) triad with 14-membered macrocyclic P4-nSn (n = 2, 1, 0) ligands. Study of the effects on coordination of the relative configuration at the phosphines and the number and placement of thioether sites. Inorg Chem 26 1647-1658... 

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