Restriction of the environment of the dimethylthallium(III) ion by ‘threading’ through a crown ether: X-ray crystal structure of dimethyl(dibenzo[b,k][1,4,7,10,13,16]hexaoxacyclo-octadecin)thallium(III)2,4,6-trinitrophenolate

Abstract

Restriction of theEnvironment of the Dimethylthallium(III) Ion by 'Threading' through a Crown Ether: X-Ray Crystal Structure of Dimethyl(dibenzo[b,k] [ I ,4,7,10,13,16] hexaoxacyclo-octadecin)thall i um (111) 2,4,6-Trinitrophenolate

Structures of complexes between dimethylthallium picrate and two isomers of dicyclohexano-18-crown-6

“…The T1--C bond lengths in A, Table 3, are not significantly different from each other or from that in B or in the dibenzo-18-crown-6 complex (Henrick et al, 1982). The average value 2.11 (1),/~ agrees with that suggested by Chow & Britton (1975) who made an extensive study of dimethylthallium compounds.…”

“…In both crystals, contacts between neighbouring moieties are at typical van der Waals distances, principally between the picrate atoms and C atoms of the crown ligand. * Although the two methyl groups in the crystal of (dibenzo-18-crown-6)dimethylthallium picrate are not equivalent, Henrick et al (1982) note that they did not give separate IH NMR signals in solution. For the isomer A complex, the two methyl groups are magnetically distinguishable in solution (Kawasaki & Kitano, 1978).…”

“…In the preliminary report on dimethylthallium dibenzo-18-crown-6 picrate, Henrick et al (1982) depicted an arrangement of the ligand similar to that in its complexes with sodium bromide (Bush & Truter, 1971), and potassium iodide (Aldoshin, D'yachenko, Tkachev & Atovmyan, 1981;Myskiv et al, 1980), i.e. nearly coplanar O atoms with both benzene rings on one side, as in form (1) of Fig.…”

“…reported isolation of complexes formed from the same cation and anion, dimethylthallium picrate, by each of the dicyclohexano-18-crown-6 isomers, A and B (Kawasaki & Kitano, 1978), has provided the crystals for the present study with the additional interest that those authors had measured the IH NMR spectra in CDCI 3. A recent preliminary communication of the structure of dimethylthallium picrate complex with dibenzo-18-crown-6 (Henrick, Matthews, Podejma & Tasker, 1982) allows further comparison. A preliminary account of the crystal-structure determinations of the dimethylthallium picrate complexes, A (with isomer A) and B (with isomer B), has appeared (Hughes & Truter, 1982).…”

A 1:1 complex between 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) and mercury(II) iodide

“…There are several examples of 18C6 (Paige & Richardson, 1984;Kawasaki & Matsuura, 1984), DA18C6 (Malmsten, 1979), and DB18C6 (Henrick, Matthews, Podejma & Tasker, 1982;Crowder, Henrick, Matthews & Podejma, 1983), and of the ciscisoid-cis and cis-transoid-cis isomers of dicyclohexano-18-crown-6 (Hughes & Truter, 1983)forming complexes with guest molecules such as CdC12, HgC12, Hgl 2, and TIMe2 +, threaded through the centre of the Experimental. A solution of MeSPh+.HgI~ (200 mg) in warm MeOH (15 ml) was added to a solution of 18C6 (34 mg) in MeOH (5 ml).…”