Journal of Chemical Crystallography, Vol. 34, No. 3, March 2004 ( C  2004) Crystal structure of (ethylenediammonium- N , N ′ -di-3-propanoic acid) tetrachloropalladate(II) complex G.N. Kalu derovi´ c, (1) F.W. Heinemann, (1) N. ˇ Z. Kneˇ zevi´ c, (1) S.R. Trifunovi´ c, (1)∗ and T. J. Sabo (1) Received June 20, 2002 The title compound was obtained by a synthesis from ethylenediamine-N, N ′ -di-3-propanoic acid dihydrochloride (H 2 eddp · 2HCl) and potassium hexachloropalladate(IV) (molar ratio 1:1, in water). Its structure has been determined by single-crystal X-ray diffraction: mono- clinic space group P 2 1 / n, a = 8.198(1), b = 10.282(1), c = 9.080(1) ˚ A, β = 103.62(1) ◦ , V = 743.9(2) ˚ A 3 , and Z = 2. The dianionic complex has a square-planar coordination geometry with four chloro ligands, and ethylenediamine- N , N ′ -di-3-propanoic acid as di- cation in the second coordination sphere. This is the first reported Pd(II) structure with uncoordinated H 2 eddp. KEY WORDS: Palladium(II) complex; eddp; crystal structure; square-planar geometry. Introduction The ethylenediamine-N, N ′ -di-3-propanoate ion (eddp) can act as bidentate, tridentate, and most often as tetradentate ligand. 1 Geometri- cal isomerism of corresponding metal com- plexes has been an interesting field studied by a number of groups. 1−11 The crystal structure of ethylenediamine-N, N ′ -di-3-propanoic acid has been described. 12,13 Metal complexes with this ligand are known only with eddp being a coor- dinating ligand. 14,15 (1) Faculty of Chemistry, University of Belgrade, Studentski trg 16, P.O. Box 158, 11001 Belgrade, Serbia and Montenegro. (2) Institut f¨ ur Anorganische Chemie II, Egerlandstrasse 1, D-91058 Erlangen, Deutchland. (3) Department of Chemistry, Faculty of Science, University of Kragujevac, 34000 Kragujevac, Serbia and Montenegro. ∗ To whom correspondence should be addressed: e-mail: SRECKO@knez.uis.kg.ac.yu. Dickinson 16 reported the crystal structures of potassium and ammonium tetrachloropalla- date(II). The anion in our work forms a square- planar structure, as is expected for palladium(II) complex. Experimental Physical measurements IR spectrum was recorded on a Perkin- Elmer FT-IR 1726X spectrophotometer using KBr technique. Preparations Ethylenediamine- N , N ′ -di-3-propanoic acid dihydrochloride was synthesized by a standard 185 1074-1542/04/0300-0185/0 C  2004 Plenum Publishing Corporation