NDLI: A one-dimensional barium(II) coordination polymer with a coordinated nitro group of 2-nitrobenzoate

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A one-dimensional barium(II) coordination polymer with a coordinated nitro group of 2-nitrobenzoate

Content Provider	Springer Nature Link
Author	Srinivasan, Bikshandarkoil R. Shetgaonkar, Santosh Y. Raghavaiah, Pallepogu
Copyright Year	2008
Abstract	The aqueous reaction of barium carbonate with 2-nitrobenzoic acid (2-nbaH) results in the formation of a one-dimensional coordination polymer, catena-poly[[hexa(aqua)dibarium(II)]bis[(μ $_{2}$-2-nitrobenzoate-O,O,O-NO$_{2}$)(μ $_{2}$-2-nitrobenzoate-O,O,O′)]] 1. On heating at 100°C compound 1 is dehydrated to anhydrous barium bis(2-nitrobenzoate) 2. The anhydrous compound can be re-hydrated to 1 on exposure to water vapour. Compounds 1 and 2 were characterized by elemental analysis, IR and UV-Vis spectra, DSC thermograms, weight loss studies and the structure of 1 was determined. 1 and 2 can be thermally decomposed to BaCO$_{3}$ by heating at 800°C. The polymer [[Ba(H$_{2}$O)$_{3}$]$_{2}$(μ $_{2}$-2-nba-O,O,O-NO$_{2}$)$_{2}$ (μ $_{2}$-2-nba-O,O,O′)$_{2}$]$_{ n }$ 1 crystallizes in the centrosymmetric triclinic space group Pī and all atoms are located in general positions. The polymeric structure is based on a dimeric unit and consists of three water molecules coordinated to a central Ba(II) and two unique 2-nitrobenzoate (2-nba) anions, one of which (μ $_{2}$-2-nba-O,O,O-NO$_{2}$) functions as a tridentate ligand and is linked to a Ba(II) through the oxygen atom of the-NO$_{2}$ group and forms a monoatomic μ $_{2}$-carboxylate bridge between two symmetry related Ba(II) ions with a Ba···Ba distance of 4·5726(14) Å. The second unique 2-nba anion (μ $_{2}$-2-nba-O,O,O′) also functions as a tridentate ligand with the carboxylate oxygen atoms linked to a Ba(II) ion in a bidentate fashion and one of the carboxylate oxygen atoms forming a monoatomic bridge between two symmetry related Ba(II) ions resulting in a Ba···Ba separation of 4·5406(15) Å. These differing tridentate 2-nba ligands link {Ba(H$_{2}$O)$_{3}$} units into a one-dimensional polymeric chain extending along b axis. In the infinite chain each nine coordinated Ba(II) is bonded to three water molecules and further linked to six oxygen atoms of four different 2-nitrobenzoate anions with alternating pairs of Ba(II) ions in the chain bridged by a pair of (μ $_{2}$-2-nba-O,O,O-NO$_{2}$) and (μ $_{2}$-2-nba-O,O,O′) ligands resulting in alternating Ba···Ba distances of 4·5406(15) and 4·5726(14) Å across the chain.
Starting Page	249
Ending Page	257
Page Count	9
File Format	PDF
ISSN	02534134
Journal	Journal of Chemical Sciences
Volume Number	120
Issue Number	2
e-ISSN	09737103
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-04-27
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coordination polymer catena-poly[[hexa(aqua)dibarium(II)]bis[(μ $_{2}$-2-nitrobenzoato-O,O,O-NO$_{2}$)(μ $_{2}$-nitrobenzoato-O,O,O′)]] nitro ligation tridentate monoatomic bridge nine coordination Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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