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A coordination polymer with unusual structural features from imidazolylbutyric acid and titanium isopropoxide.

Czakler M, Puchberger M, Artner C, Schubert U - Monatsh. Chem. (2014)

Bottom Line: The coordination polymer [Ti(OiPr)3(OOCCH2CH2CH2C3N2H3)] n was prepared from 4-(imidazol-1-yl)butyric acid and titanium isopropoxide.The structure of the compound is remarkable, as the carboxylate group is coordinated in a chelating manner and no dimerization of the Ti(OiPr)3 groups through OR bridges was observed.

View Article: PubMed Central - PubMed

Affiliation: Institute of Materials Chemistry, Vienna University of Technology, Vienna, Austria.

ABSTRACT

Abstract: The coordination polymer [Ti(OiPr)3(OOCCH2CH2CH2C3N2H3)] n was prepared from 4-(imidazol-1-yl)butyric acid and titanium isopropoxide. The structure of the compound is remarkable, as the carboxylate group is coordinated in a chelating manner and no dimerization of the Ti(OiPr)3 groups through OR bridges was observed.

No MeSH data available.


Packing of the chains perpendicular to the b-axis. Isopropoxo ligands and hydrogen atoms were omitted for clarity
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Fig3: Packing of the chains perpendicular to the b-axis. Isopropoxo ligands and hydrogen atoms were omitted for clarity

Mentions: In the crystalline state, compound 1 is a coordination polymer with mononuclear Ti(OiPr)3 units as connector and L as linker, coordinating through the carboxylate group to one Ti atom and the imidazolyl group to the next (Fig. 2). Although the alkyl chain is highly flexible, no back-biting of one of the imidazolyl nitrogen atoms to the same titanium atom was observed. The polymer chain extends parallel to the a-axis (Fig. 3). The titanium atoms are six-coordinate with a distorted octahedral coordination geometry and the OiPr ligands in a mer arrangement. Distortion of the polyhedron is due to the chelating carboxylate group and results in O–Ti–O bond angles of the OiPr ligands between 99.55°  and 108.2°. The coordinating nitrogen atom is slightly tilted towards the carboxylate ligand. The Ti(1)–N(2) distance is distinctly shorter than that observed in the Ti(OR)4(amine) adducts with primary amines, which are typically in the range 129–131 pm, or in Ti(OR)x derivatives with DHP ligands (226 pm, DHP-H2 = 4,6-dihydroxypyrimidine) [19].Fig. 2


A coordination polymer with unusual structural features from imidazolylbutyric acid and titanium isopropoxide.

Czakler M, Puchberger M, Artner C, Schubert U - Monatsh. Chem. (2014)

Packing of the chains perpendicular to the b-axis. Isopropoxo ligands and hydrogen atoms were omitted for clarity
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4494772&req=5

Fig3: Packing of the chains perpendicular to the b-axis. Isopropoxo ligands and hydrogen atoms were omitted for clarity
Mentions: In the crystalline state, compound 1 is a coordination polymer with mononuclear Ti(OiPr)3 units as connector and L as linker, coordinating through the carboxylate group to one Ti atom and the imidazolyl group to the next (Fig. 2). Although the alkyl chain is highly flexible, no back-biting of one of the imidazolyl nitrogen atoms to the same titanium atom was observed. The polymer chain extends parallel to the a-axis (Fig. 3). The titanium atoms are six-coordinate with a distorted octahedral coordination geometry and the OiPr ligands in a mer arrangement. Distortion of the polyhedron is due to the chelating carboxylate group and results in O–Ti–O bond angles of the OiPr ligands between 99.55°  and 108.2°. The coordinating nitrogen atom is slightly tilted towards the carboxylate ligand. The Ti(1)–N(2) distance is distinctly shorter than that observed in the Ti(OR)4(amine) adducts with primary amines, which are typically in the range 129–131 pm, or in Ti(OR)x derivatives with DHP ligands (226 pm, DHP-H2 = 4,6-dihydroxypyrimidine) [19].Fig. 2

Bottom Line: The coordination polymer [Ti(OiPr)3(OOCCH2CH2CH2C3N2H3)] n was prepared from 4-(imidazol-1-yl)butyric acid and titanium isopropoxide.The structure of the compound is remarkable, as the carboxylate group is coordinated in a chelating manner and no dimerization of the Ti(OiPr)3 groups through OR bridges was observed.

View Article: PubMed Central - PubMed

Affiliation: Institute of Materials Chemistry, Vienna University of Technology, Vienna, Austria.

ABSTRACT

Abstract: The coordination polymer [Ti(OiPr)3(OOCCH2CH2CH2C3N2H3)] n was prepared from 4-(imidazol-1-yl)butyric acid and titanium isopropoxide. The structure of the compound is remarkable, as the carboxylate group is coordinated in a chelating manner and no dimerization of the Ti(OiPr)3 groups through OR bridges was observed.

No MeSH data available.