No abstract

No abstract

Thiacalix[4]-bis-crown-5 (L) was employed as a model host molecule, which shows both HSAB concept and endo/exo-coordination modes. In the K + complexations, a dinuclear complex [K 2 (L)](ClO 4 ) 2 ·CH 3 CN (1) as well as a mononuclear complex [K(L)][Pt(tht)Cl 5 ] (2) (tht = tetrahydrothiophene) were isolated: the latter as first example in such symmetrical hosts. Each K + in both species is stabilized not only by K + -O bondings (hard acid -hard base) in the crown cavities (endo-coordination) but also by K + -π interactions. The Ag + complexations afforded infinite products (3 and 4) in which the Ag + binds to the sulphur bridges (soft acid -soft base) from outside the cavity [a]

No abstract

No abstract