Transition metal complexes of dibenzoyl-L-tartaric acid (db-L-tarH2) and L-tartaric acid (L-tarH2) ; X-ray crystal structure of {[Cu(L-tar) (phen)] · 6H2O}n (phen = 1,10-phenanthroline)

Article abstract of DOI:10.1016/S0277-5387(97)00100-9

Dibenzoyl-L-tartaric acid (db-L-tarH₂) reacts with [Cu₂(μ-O₂CCH₃)₄(H ₂O)₂] to form the tartrate complex [Cu(L-tar)] (1) (L-tarH₂ = L-tartaric acid). 1 reacts with 2,2′-bipyridine (bipy) and 1,10-phenanthroline (phen) yielding [Cu(L-tar)(bipy)] · 6H₂O (2) and [Cu(L-tar)(phen)] · 4H₂O (3), respectively. A crystal of composition {[Cu(L-tar) (phen)] · 6H₂O}_n (4) was taken directly from the original mother liquor of 3. The X-ray crystal structure of the polymeric complex 4 shows each copper(II) ion to be six-coordinate, being chelated by a phenanthroline ligand and also chelated by a carboxylate oxygen atom and a hydroxyl oxygen atom from one end of a tartrate group. A carboxylate oxygen atom and a hydroxyl oxygen atom from one end of a symmetry-related tartrate ligand also chelates to the metal. Dibenzoyl-L-tartaric acid also reacts with [Mo₂(μ-O₂CCH₃)₄], [Mo₂(CH₃CN)₈][BF₄]₄, {[Ru₂(μ-O₂CCH₃)₄Cl]}_n and Na₄[Rh₂(μ-CO₃)₄] · 2.5H₂O to give {[Mo₂(db-L-tar)₂] · 5H₂O}_n (5), [Mo₂(db-L-tar)(CH₃CN)₄][BF₄] ₂ · 7H₂O (6), {[Ru₂(db-L-tar)_2.5] · 2H₂O}_n (7) and {[Rh₂(db-L-tar)₂(H₂O)₂] · H₂O}_n (8), respectively.