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Updated: Jun 22, 2026
Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
Polymorphism and inclusion properties of three-dimensional metal-organometallic frameworks derived from a
Sayon A Kumalah1, K Travis Holman
1Department of Chemistry, Georgetown University, Washington, District of Columbia 20057, USA.
Abstract:
An organometallic sandwich compound of terephthalic acid, namely, [(eta(5)-Cp)Fe(II){eta(6)-(1,4-C(6)H(4)(COOH)(2))}](+) (H(2)1(+)), is reported, along with X-ray single crystal structures of [H1 x H(2)1][PF(6)] and H1. [H(2)1 x H1][PF(6)] was reacted with the nitrate salts of Co(II) and Ni(II) to yield a series of three-dimensional (3D) metal-organometallic framework (MOMF) materials of the composition [M(3)(1)(4)(mu-H(2)O)(2)(H(2)O)(2)][NO(3)](2) x xsolvent (M = Co(II) (2), Ni(II) (3); xsolvent = 4EtOH, or 2DMF x 2 H(2)O). These framework structures were shown by single crystal and powder X-ray diffraction to be polymorphic, possessing identical 3D body-centered tetragonal network topologies, but differing in the manner by which the [CpFe](+) groups are arranged within the two-dimensional, square grid sheets of the 3D networks. alpha-2-EtOH, beta-2-EtOH, alpha-3-EtOH, beta-2-DMF, and beta-3-DMF were thermally desolvated, giving rise to isolable apohosts of composition [M(3)(1)(4)(mu-H(2)O)(2)(H(2)O)(2)][NO(3)](2) (M = Co(II) (2), Ni(II) (3)) that were shown by PXRD to possess different, as yet unknown, crystal structures. The desolvated apohosts were studied with respect to their ability to selectively reabsorb water and/or alcohols. They show a modest preference for the absorption of water and short chain, linear alcohols (
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