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Crystal structures of three lead(II) acetate-bridged di-amino-benzene coordination polymers.

Geiger DK, Parsons DE, Zick PL - Acta Crystallogr Sect E Struct Rep Online (2014)

Bottom Line: Chains along [010] are joined by bridging acetate ligands to form planes parallel to (10-1). (II) and (III) are isotypic and have one Pb(II) ion in the asymmetric unit that has an O6N coordination sphere.Polymeric chains parallel to [100] exhibit hydrogen bonding between the amine and acetate ligands.In (III), additional hydrogen bonds between cyano groups and non-coordinating amines join the chains by forming R 2 (2)(14) rings.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, SUNY-College at Geneseo, Geneseo, NY 14454, USA.

ABSTRACT
Poly[tris-(acetato-κ(2) O,O')(μ2-acetato-κ(3) O,O':O)tetra-kis-(μ3-acetato-κ(4) O,O':O:O')bis-(benzene-1,2-di-amine-κN)tetra-lead(II)], [Pb4(CH3COO)8(C6H8N2)2] n , (I), poly[(acetato-κ(2) O,O')(μ3-acetato-κ(4) O,O':O:O')(4-chloro-benzene-1,2-diamine-κN)lead(II)], [Pb(CH3COO)2(C6H7ClN2)] n , (II), and poly[(κ(2) O,O')(μ3-acetato-κ(4) O,O':O:O')(3,4-di-amino-benzo-nitrile-κN)lead(II)], [Pb(CH3COO)2(C7H7N3)] n , (III), have polymeric structures in which monomeric units are joined by bridging acetate ligands. All of the Pb(II) ions exhibit hemidirected coordination. The repeating unit in (I) is composed of four Pb(II) ions having O6, O6N, O7 and O6N coordination spheres, respectively, where N represents a monodentate benzene-1,2-di-amine ligand and O acetate O atoms. Chains along [010] are joined by bridging acetate ligands to form planes parallel to (10-1). (II) and (III) are isotypic and have one Pb(II) ion in the asymmetric unit that has an O6N coordination sphere. Pb2O2 units result from a symmetry-imposed inversion center. Polymeric chains parallel to [100] exhibit hydrogen bonding between the amine and acetate ligands. In (III), additional hydrogen bonds between cyano groups and non-coordinating amines join the chains by forming R 2 (2)(14) rings.

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The three acetate coordination modes observed in (I), (II), and (III), showing (a) acetato-κ2O,O′, (b) μ3-acetato-κ4O,O′:O:O′, and (c) μ2-acetato-κ3O,O′:O.
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fig1: The three acetate coordination modes observed in (I), (II), and (III), showing (a) acetato-κ2O,O′, (b) μ3-acetato-κ4O,O′:O:O′, and (c) μ2-acetato-κ3O,O′:O.

Mentions: Fig. 1 ▶ shows the three acetate coordination modes displayed by (I), (II), and (III). The three modes will be referred to hereafter as types (a), (b) and (c). As seen in Fig. 2 ▶, the asymmetric unit of (I) has four symmetry-independent Pb atoms. The Pb atoms are linked by bridging acetate ligands of type (b) to form a ladder-chain parallel to [010]. Each is also coordinated to a bidentate acetate ligand of type (a) and Pb2 and Pb4 have an amine nitro­gen in their coordination spheres. Finally, atoms Pb3 and Pb4 are linked by an acetato ligand of type (c). The two benzene-1,2-di­amine ligands are approximately coplanar. The angle formed by the benzene mean planes is 6.1 (4)°, with N1, N2, N3 and N4 being 0.051 (16), 0.013 (19), 0.074 (16), and 0.034 (16) Å from their respective planes.


Crystal structures of three lead(II) acetate-bridged di-amino-benzene coordination polymers.

Geiger DK, Parsons DE, Zick PL - Acta Crystallogr Sect E Struct Rep Online (2014)

The three acetate coordination modes observed in (I), (II), and (III), showing (a) acetato-κ2O,O′, (b) μ3-acetato-κ4O,O′:O:O′, and (c) μ2-acetato-κ3O,O′:O.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4257386&req=5

fig1: The three acetate coordination modes observed in (I), (II), and (III), showing (a) acetato-κ2O,O′, (b) μ3-acetato-κ4O,O′:O:O′, and (c) μ2-acetato-κ3O,O′:O.
Mentions: Fig. 1 ▶ shows the three acetate coordination modes displayed by (I), (II), and (III). The three modes will be referred to hereafter as types (a), (b) and (c). As seen in Fig. 2 ▶, the asymmetric unit of (I) has four symmetry-independent Pb atoms. The Pb atoms are linked by bridging acetate ligands of type (b) to form a ladder-chain parallel to [010]. Each is also coordinated to a bidentate acetate ligand of type (a) and Pb2 and Pb4 have an amine nitro­gen in their coordination spheres. Finally, atoms Pb3 and Pb4 are linked by an acetato ligand of type (c). The two benzene-1,2-di­amine ligands are approximately coplanar. The angle formed by the benzene mean planes is 6.1 (4)°, with N1, N2, N3 and N4 being 0.051 (16), 0.013 (19), 0.074 (16), and 0.034 (16) Å from their respective planes.

Bottom Line: Chains along [010] are joined by bridging acetate ligands to form planes parallel to (10-1). (II) and (III) are isotypic and have one Pb(II) ion in the asymmetric unit that has an O6N coordination sphere.Polymeric chains parallel to [100] exhibit hydrogen bonding between the amine and acetate ligands.In (III), additional hydrogen bonds between cyano groups and non-coordinating amines join the chains by forming R 2 (2)(14) rings.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, SUNY-College at Geneseo, Geneseo, NY 14454, USA.

ABSTRACT
Poly[tris-(acetato-κ(2) O,O')(μ2-acetato-κ(3) O,O':O)tetra-kis-(μ3-acetato-κ(4) O,O':O:O')bis-(benzene-1,2-di-amine-κN)tetra-lead(II)], [Pb4(CH3COO)8(C6H8N2)2] n , (I), poly[(acetato-κ(2) O,O')(μ3-acetato-κ(4) O,O':O:O')(4-chloro-benzene-1,2-diamine-κN)lead(II)], [Pb(CH3COO)2(C6H7ClN2)] n , (II), and poly[(κ(2) O,O')(μ3-acetato-κ(4) O,O':O:O')(3,4-di-amino-benzo-nitrile-κN)lead(II)], [Pb(CH3COO)2(C7H7N3)] n , (III), have polymeric structures in which monomeric units are joined by bridging acetate ligands. All of the Pb(II) ions exhibit hemidirected coordination. The repeating unit in (I) is composed of four Pb(II) ions having O6, O6N, O7 and O6N coordination spheres, respectively, where N represents a monodentate benzene-1,2-di-amine ligand and O acetate O atoms. Chains along [010] are joined by bridging acetate ligands to form planes parallel to (10-1). (II) and (III) are isotypic and have one Pb(II) ion in the asymmetric unit that has an O6N coordination sphere. Pb2O2 units result from a symmetry-imposed inversion center. Polymeric chains parallel to [100] exhibit hydrogen bonding between the amine and acetate ligands. In (III), additional hydrogen bonds between cyano groups and non-coordinating amines join the chains by forming R 2 (2)(14) rings.

No MeSH data available.


Related in: MedlinePlus