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Design and Self‐Assembly of Ditopic and Tetratopic Cavitand Complexes
Author(s) -
Menozzi Edoardo,
Busi Marco,
Ramingo Romina,
Campagnolo Mara,
Geremia Silvano,
Dalcanale Enrico
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200401061
Subject(s) - cavitand , chemistry , ligand (biochemistry) , metal , stereochemistry , self assembly , crystallography , crystal structure , supramolecular chemistry , organic chemistry , receptor , biochemistry
The self‐assembly of open ditopic and tetratopic cavitand complexes has been investigated by using monofunctionalized cavitand ligands and suitable metal precursors. In the case of ditopic complexes, self‐assembly protocols, leading exclusively to the formation of both thermodynamically stable cis ‐Pt square‐planar complexes 8 and 9 and the kinetically inert fac ‐Re octahedral complex 14 , have been elaborated. The use of cis ‐[Pt(CH 3 CN) 2 Cl 2 ] as metal precursor led to the formation of monotopic trans ‐ 10 and ditopic trans ‐ 11 cavitand complexes, while cis ‐[Pt(dmso) 2 Cl 2 ] afforded both cis ‐ 13 and trans ‐ 11 isomers. The self‐assembly of tetratopic cavitand complexes has been achieved by using mononuclear [Pd(CH 3 CN) 4 (BF 4 ) 2 ] and dinuclear [M 2 (tppb)(OTf) 4 ] ( 19 : M=Pt; 20 : M=Pd) metal precursors. Only the tetratopic dinuclear complexes 21 and 22 were stable. The ligand configuration with two phosphorus and two cavitand ligands at the metal centers is the most appropriate to build tetratopic cavitand complexes with sufficient kinetic stability.