Syntheses and Crystal Structures of Two Cadmium Methanetetrabenzoates Featured by Open Framework and Infinite Layers

Colorless single crystals of Cd 2 [μ 8 ‐MTB] · 3H 2 O · DMF ( 1 ) were prepared in DMF/H 2 O solution [ 1 : space group C 2/ c (no. 15) with a = 1821.30(6), b = 2175.08(6), c = 1269.87(4) pm, β = 129.684(1)°]. The connection between the methane‐ p ‐benzoate tetraanions (MTB 4– ) and the Cd 2+ cations leads to a three‐dimensional framework with channels extending along [ 1 10] and [110] with openings of 670 pm × 360 pm. The channel‐like voids accommodate water molecules and N , N ‐dimethylformamide (DMF) molecules not bound to Cd 2+ . Colorless single crystals of [Cd 4 (2,2′‐bipy) 4 (μ 7 ‐MTB) 2 ] · 7DMF ( 2 ) were prepared in DMF in the presence of 2,2′‐bipyridine [ 2 : space group P 1 (no. 2) with a = 1224.84(4), b = 1418.85(5), c = 2033.49(4) pm, α = 85.831(2)°, β = 88.351(2)°, γ = 68.261(1)°]. The coordination of MTB 4– to Cd 2+ results in infinite layers parallel to (001). The layers, not connected by any hydrogen bonds, contain small openings of about 320 pm × 340 pm.