Issue 38, 2008

Assembly of tetra, di and mononuclear molecular cadmium phosphonates using 2,4,6-triisopropylphenylphosponic acid and ancillary ligands

Abstract

The reaction of ArPO3H2 (Ar = 2,4,6-iPr3-C6H2) with Cd(CH3COO)2·2H2O using various co-ligands such as methanol, dimethylformamide (DMF) and 3,5-dimethylpyrazole (DMPZH) resulted in the formation of tetranuclear assemblies [Cd4(ArPO3)2(ArPO3H)4(CH3OH)4]·3(CH3OH) (1), [Cd4(ArPO3)2(ArPO3H)4(DMF)4]·3(DMF) (2) and [Cd4(ArPO3)2(ArPO3H)4(DMF)2(DMPZH)2]·2(DMF)·2(H2O) (3). In all of these compounds the tetranuclear cadmium array, containing two five-coordinate and two six-coordinate cadmium atoms, is held together by two μ4 capping [ArPO3]2− and four anisobidentate μ2 [ArPO2(OH)] ligands. Each cadmium atom is bound to an additional ancillary ligand. The reaction of ArPO3H2 with Cd(CH3COO)2·2H2O in the presence of the chelating ligand 2,2′-bipyridine (bipy) leads to the exclusive formation of the dinuclear assembly [Cd2(ArPO3H)4(bipy)2]·(CH3OH)(H2O) (4). The latter contains an eight-membered Cd2P2O4 inorganic ring formed as a result of the bridging coordination action of two anisobidentate μ2 [ArPO2(OH)] ligands. Each cadmium atom is bound by one chelating bipy and one monodentate [ArPO2(OH)] ligands. Use of four equivalents of 3,5-dimethylpyrazole leads to the formation of the mononuclear derivative [Cd(ArPO3H)2(DMPZH)4] (5). The molecular structure of the latter comprises of a central cadmium atom surrounded by six monodentate ligands. Four of these are neutral pyrazole ligands that occupy the equatorial plane; the remaining two are anionic phosphinate ligands which are present trans to each other. The thermal analysis of 1 and 4 reveals that the char residue obtained at 600 °C consists predominantly of Cd2P2O7.

Graphical abstract: Assembly of tetra, di and mononuclear molecular cadmium phosphonates using 2,4,6-triisopropylphenylphosponic acid and ancillary ligands

Supplementary files

Article information

Article type
Paper
Submitted
26 Feb 2008
Accepted
04 Jun 2008
First published
11 Aug 2008

Dalton Trans., 2008, 5189-5196

Assembly of tetra, di and mononuclear molecular cadmium phosphonates using 2,4,6-triisopropylphenylphosponic acid and ancillary ligands

V. Chandrasekhar, P. Sasikumar and R. Boomishankar, Dalton Trans., 2008, 5189 DOI: 10.1039/B803256D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements