Assembling Discrete D4R Zeolite SBUs through Noncovalent Interactions. 3. Mediation by Butanols and 1,2-Bis(dimethylamino)ethane

• Published in: Inorganic chemistry Vol. 49; no. 5; pp. 2153 - 2162
• Main Authors: Murugavel, Ramaswamy, Kuppuswamy, Subramaniam, Gogoi, Nayanmoni, Steiner, Alexander
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 01.03.2010
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/ic901932r

The use of tetrameric zinc phosphate [Zn(dipp)(CH3OH)]4 (1; dipp = diisopropylphenylphosphate dianion) as a suitable building block for realizing new noncovalently linked extended structures, via facile replacement of coordinated methanol molecules by other alcohols, is reported herein. Compounds [Zn(dipp)(sec-butanol)]4·4H2O (2) and [Zn(dipp)(tert-butanol)]4·4H2O (3) have been synthesized by the addition of sec- or tert-butanol to 1 at room temperature. The reaction of zinc acetate or zinc sulfate with dippH2 in the presence of N,N,N′,N′-tetramethylethylenediamine (tmeda) under similar reaction conditions results in the formation of [H2tmeda][Zn4(dipp)4(MeOH)2(OAc)2]·(CH3OH) (4) or [H2tmeda][Zn3(dipp)3(dippH)2(CH3OH)]·(CH3OH)3 (5), respectively. Analytically pure compounds 2−5 have been isolated in the form of single crystals directly from the respective reaction mixtures in very good yields and characterized with the aid of analytical and spectroscopic studies. Single-crystal X-ray diffraction studies reveal that compounds 2 and 3 are neutral tetranuclear zinc phosphates. Compound 4 is also a tetrameric phosphate but is anionic. The core structures of compounds 2−4 resemble the double-4-ring secondary building unit (D4R SBU) in zeolites. Compound 5 is a trinuclear ionic zinc phosphate built from three fused S4R SBUs. Compounds 4 and 5 represent the first examples of discrete anionic zinc organophosphates. The presence of coordinated sec- or tert-butanol molecules and a planar water tetramer cluster in 2 and 3, and the H2tmeda cations and methanol solvents in 4 and 5, leads to the formation of zigzag chainlike supramolecular assemblies in the solid state.