Entangled 3D metal-organic architectures from the self-assembly of mixed ligands and transition-metal ions

Abstract Two new entangled 3D metal-organic frameworks, [Ni 2 (TP) 2 (BPP) 2 (H 2 O) 2 ] n ( 1 ) and {[Co(TP)(BPP)] 4 ·6H 2 O} n ( 2 ), have been hydrothermally synthesized with mixed ligands of terephthalate (TP) and 1,3-bis(4-pyridyl)propane (BPP) and transition-metal nitrates. Both compounds were characterized by elemental analysis, TGA, IR and single crystal X-ray diffraction. Compound 1 crystallizes in the orthorhombic space group P nna with a  = 18.350(4), b  = 13.447(3), c  = 16.394(3) A, V  = 4045.2(14) A 3 , Z  = 4, R 1(w R 2) = 0.0481(0.1072). Compound 2 crystallizes in the triclinic space group P 1 ¯ with a  = 11.860(2), b  = 18.029(4), c  = 20.069(4) A, α  = 106.94(3), β  = 92.27(3), γ  = 97.02(3), V  = 4061.2(14) A 3 , Z  = 2, R 1(w R 2) = 0.0895(0.2279). Compound 1 contains a new type of 1D zigzag ladders which are further interlocked with the other two identical ones, forming a 3D polycatenated framework. Compound 2 displays a new 3D “inclined” interpenetration architecture based on 2D undulated layers.