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The compounds Pr 6 (C 2 )Br 10 , Pr 10 (C 2 ) 2 Br 15  and Pr 14 (C 2 ) 3 Br 20  were prepared from PrBr 3  and the appropriate amounts of Pr and C and characterized by X-ray structure analyses of single crystals. All three compounds crystallize in space group P1 with lattice parameters a = 7.571(2), b = 9.004(2), c = 9.062(2) Å ,α = 108.57(3), β = 97.77(3), γ = 106.28(3) ◦  for Pr 6 (C 2 )Br 10 ; a = 9.098(2), b = 10.127(2), c = 10.965(2) A° , α = 70.38(3), β = 66.31(3), γ = 70.84(3) ◦  for Pr 10 (C 2 ) 2 Br 15 ; a = 9.054(2), b = 10.935(2), c = 13.352(3) Å , α = 86.27(3), β = 72.57(3), γ = 66.88(3) ◦  for Pr 14 (C 2 ) 3 Br 20 . They are members of a general series Ln 4n+2 (C 2 ) n Br 5n+5  and isostructural with the corresponding iodides known for Ln = La, Ce, Pr. Pr 6 (C 2 )Br 10  was further characterized via transmission electron microscopy techniques

The Starting Members of the Series Pr 4n+2 (C 2 ) n Br 5n+5 (n = 1, 2, 3)