摘要:
IntroductionSelf-assembled supramolecular complexes are currently of great interest due to their intriguing network topologies and potential applications in molecular recognition, magnetic materials, nonlinear optical devices and catalysts.1–8However, macrocyclic complexes containing functional pendant groups have seldom been employed as building blocks in the construction of supramolecular networks.9A few years ago, a six-coordinated macrocyclic complex [NiL]2+containing two functional propionitrile pendant groups (L = 3,10-bis(2-propionitrilo)-1,3,5,8,10,12-hexaazacyclotetradecane) was synthesized, and X-ray crystallography indicates it forms a 1D coordination polymer [NiL]n(BF4)2nthrough the coordination interactions of neighboring propionitrile nitrogen atoms with Ni(ii) ions in axial positions.10Recently, we reacted Ni(ClO4)2with a similar macrocyclic copper(ii) complex, [CuL]Cl2, and tried to synthesize a two-dimensional square-grid coordination polymer [(CuL)2Ni(H2O)2]n(ClO4)6nthrough the coordinationinteraction of propionitrile nitrogen atoms with Ni(ii) ions. The reason we chose [CuL]Cl2as a building block is that the coordination interaction at the axial position of a six-coordinated copper(ii) ion is weak due to the Jahn–Teller effect as observed in other copper(ii) macrocyclic complexes.11,12In this case, one can expect that the propionitrile nitrogen atoms will coordinate firstly to the Ni(ii) ion to form a two-dimensional coordination polymeric cation [(CuL)2Ni(H2O)2]n6n+. Unexpectedly, a 1D coordination polymer [CuL]n(ClO4)2nwas formed, though the coordination interactions between the propionitrile nitrogen atoms and Cu(ii) ion inthe axial position are weaker due to the expected Jahn–Teller effect. In this paper, we report the synthesis and crystal structures of two 1D macrocyclic coordination polymers [CuL]n(ClO4)2nand [NiL]n(ClO4)2n.
ISSN:1466-8033
DOI:10.1039/b110623f
出版商:RSC
年代:2001
数据来源: RSC