title: Unsymmetrical calixcrowns incorporating hard and soft loops as a new scaffold for multinuclear endo/exocyclic complexation and networking.
abstract: Unsymmerical calix[4]crowns containing [(O(4)S)(O(5))] (L(1)) and [(O(4)S(2))(O(5))] (L(2)) as crown loops were employed as new scaffolds both for complexation studies and for network formation. Reactions of L(1) and L(2) with KI in the presence of CuI afforded a copper(I) iodide cluster linked 1D-type endocyclic dipotassium(I) complex [K(2)(L(1))(Cu(7)I(9))](n) (1) and a copper(I) iodide cluster linked 1D-type endocyclic monopotassium(I) complex [KL(2)(mu(2)-Cu(3)I(4))](n) (2), respectively. By comparison, the reaction of L(2) with KPF(6) in the presence of CuI and HgI(2) afforded the 1-D endocyclic potassium(I) complex [K(L(2))(CuHgI(4))](n) (3), linked with a CuHgI(4) cluster unit. The formation of homo- and heterodinuclear complexes in solution was also confirmed by comparative NMR studies.
authors.affiliation: Department of Chemistry (BK21) and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, South Korea.
authors.forename: Jai Young
authors.initials: JY
authors.lastname: Lee
authors.forename: So Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Sunhong
authors.initials: S
authors.lastname: Park
authors.forename: Jongchul
authors.initials: J
authors.lastname: Kwon
authors.forename: Wonbo
authors.initials: W
authors.lastname: Sim
authors.forename: Shim Sung
authors.initials: SS
authors.lastname: Lee