COMPLEXES OF BISMUTH(III) WITH AMINOPOLYCARBOXYLIC ACIDS. CRYSTAL STRUCTURES OF GUANIDINIUM AQUA(ETHYLENEDIAMINETETRAACETATO)BISMUTHATE(lll) AND AMINOGUANIDINIUM ETHYLENEDIAMINETETRAACETATOBISMUTHATE(III)

Abstract

In the crystal structure of guaninidium aqua(ethylenedi9minetetraacetato)bismuthate(III), the ethylenediaminetetraacetato tetraanion chelates to the bismuth atom through its two amino and four carboxyl oxygen atoms. A carboxylate bridge [Bi-0 = 2.694(4) A] links adjacent water-coordinated [Bi-O water = 2.673(4) A] ethylenediaminetetraacetatobismuthate(III) anions into a helical linear chain. The bismuth atom is eight-coordinate in a square-antiprismatic environment. The bismuth atom shows dodecahedral coordination in aminoguanidinium ethylenediaminetetraacetatobismuthate(III). The crystal structure features a short carboxyl bridge [Bi-O = 2.657(4) A] that links the bismuthate anions into a dinuclear entity; adjacent entities are linked by a long carbonyl bridge [Bi-0 = 2.931(4) A] into a linear chain.In both ethylenediaminetetraacetatobismuthates(III), the lone-pair of electrons is stereochemical^ inert.

New Bismuth(III), Lanthanum(III), Praseodymium (III), and Heterodinuclear Bi–La and Bi–Pr Complexes with Polyaminocarboxylate Ligands

“…For the reasons mentioned earlier, our interest is focused on precursor compounds which do not contain heteroelements or other metals in addition to the main one. The following Bi(III), La(III) and Pr(III) PAC complexes described previously in the literature and based on the various ligands used in this work fulfill this requirement: (13) and its aminoguanidinium (14) and b-alaninium (15) analogs, Bi(H 2 dtpa) Á O (20). This paper reports the preparation and characterization by FTIR and TGA of new complexes of Bi(III), La(III) and Pr(III) with edta, dtpa, ttha and egta ligands.…”

Stereochemistry of Pb(II) Complexes with Aminopolycarboxylic Ligands. The Role of a Lone Electron Pair

“…When studying crystal structures of Pb(II) complexonates with anions of nitrilotriacetic ( H 3 Nta ) [2] and ethylenediaminetetraacetic ( H 4 Edta ) [3] acids, it was found that in Na[Pb(Nta)] [2], LEP is fully delocalized, while in Na 2 [ Pb ( Edta )] · 2 H 2 O [3], it is stereochemically active.…”

“…In crystals of MPb(Nta) (where M is Na (V), K(VI), Cs (VII), NH 4 (VIII)) [2,3], the Pb and N atoms lie on a threefold axis. Each Pb atom in structures V-VIII is bonded in a tetradentate-chelate mode with three O atoms of another three ligands.…”

“…In crystals of Na 2 [Pb(Edta)] · 2H 2 O (ïVI) [3], the Pb atom is coordinated by six donor atoms (4O + 2N) of the Edta 4-ligand to form the PbO 4 N 2 E eq polyhedron shaped as the ψ-pentagonal bipyramid with the LEP in the equatorial plane. The Pb atom also forms rather weak bridging bond with the carbonyl O(6) a atom of the neighboring complex (Pb-O(6) a 3.280(7) Å), which results in the formation of infinite chains in the structure.…”

“…The complexes Cs 2 [Pb(Edta)] · 3.5H 2 O (ïVII) [3] and (NH 4 ) 2 [Pb(Edta)] · 2.5H 2 O (ïVIII) [3] each contain two crystallographically independent Pb atoms. The Pb(1) polyhedron in XVII (Pb(1)O 3 N 2 E ax ) has the form of the ψ-octahedron with the LEP in the axial position, while the Pb(2) polyhedron (Pb(2)O 4 N 2 E eq ) has the ψ-pentagonal-bipyramidal configuration, typical for Pb(II) complexonates with H 4 Edta, with the LEP in the equatorial position.…”