89104-32-5Relevant academic research and scientific papers
Synthesis and Characterisation of the Five Diastereoisomers of 4,7,13,16-Tetraphenyl-1,10-dithia-4,7,13,16-tetraphosphacyclo-octadecane: Crystal Structure of the Nickel Bromide Complex of the β-Isomer
Ciampolini, Mario,Nardi, Nicoletta,Dapporto, Paolo,Innocenti, Paolo,Zanobini, Fabrizio
, p. 575 - 580 (2007/10/02)
The novel dithiateraphospha-macrocycle 4,7,13,16-tetraphenyl-1,10-dithia-4,7,13,16-tetraphosphacyclo-octadecane (L2) has been synthesised in 14percent yield via one-step procedure.All of the five possible diastereoisomers were isolated, and two of them (α and β) used to form cobalt(II) and nickel(II) complexes.The compound 2)>Br2*2H2O crystallises in a triclinic unit cell (P1 space group) with lattice constants a=9.645(3), b=10.159(3), c=10.869(3) Aengstroem, α=68.07(4), β=78.09(4), γ=84.69(4) deg, and Z=1.Least-squares refinement gave R=0.059 for 1 395 observed reflections.The X-ray diffraction study of this complex shows that the nickel atom is six-co-ordinated by two sulphur and four phosphorus atoms of the macrocycle forming an elongated trans-octahedral geometry.The stereochemistry of the β isomer is 4RS,7RS,13SR,16SR.The 4RS,7RS,13RS,16SR isomer (α isomer) has been identified by (31)P n.m.r. spectroscopy.
