Journal of the Chemical Society, Dalton Transactions p. 1675 - 1680 (1989)
Update date:2022-09-26
Topics:
Blake, Alexander J.
Reid, Gillian
Schroeder, Martin
Reaction of RhCl3 with 1 mol equivalent of L<1,4,7,10-tetrathiacyclododecane (L1), 1,4,8,11-tetrathiacyclotetradecane (L2), and 1,5,9,13-tetrathiacyclohexadecane (L3) in refluxing MeOH affords the rhodium(III) complex cations a = 10.746(8), b = 11.298(5), c = 15.708(8) Angstroem, β = 92.00(5) degree, and Z = 4.A single-crystal X-ray structure shows the cation sitting on a crystallographically imposed C2 axis with octahedral Rh(III) bound to two mutually cis chloro ions a folded conformation with S(1) and S(8) trans to chloride, Rh-S(1) 2.287 0(12) and Rh-S(4) 2.3275(12) Angstroem.The trans isomer has not been detected spectroscopically in reactions of Rh(III) with L1 and L2; the tendency of these ligands to coordinate to second- and third-row transition-metal ions to form cis complexes is ascribed to the large radii of these metal ions relative to the cavity size of the 12- and 14-membraned rings.This is confirmed by structural analysis of a = 11.9507(20), b = 11.1055(15), c = 16.2067(18) Angstroem, β = 95.197(21) deg., and Z = 4.The single-crystal X-ray structure shows Rh(III) on an inversion centre with the six-membered chelate rings of the macrocycle adopting alternate chair and twist-boat conformations, Rh-S(1) 2.3483(25) and Rh-S(5) 2.3483(27) Angstroem.
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