Synthesis and Crystal Structure of a Novel Chiral 3D Metal-organic Framework Based on an N-methyl Substituted Salan Ligand

A chiral 3D metal-organic framework [CdL]center dot DMSO center dot H2O (1) was constructed by an N-methyl substituted salan ligand (H2L), and characterized by elemental analyses, IR, TGA, powder XRD and single-crystal X-ray crystallography. 1 crystallizes in the chiral hexagonal space group P6(5)22 with a = b = 12.2175(3), c = 51.450(3) angstrom, V = 6650.9(4) angstrom(3), Z = 6, M-r = 883.45, D-c = 1.323 g.cm(-3), F(000) = 2760, lambda(CuK alpha) = 1.54178 angstrom, mu = 4.771 mm(-1), GOOF = 1.041, R = 0.0313 for 3901 observed reflections with I > 2 sigma(1) and wR = 0.0773. 1 consists of three identical sets of independent 3D frameworks interpenetrated with each other. In each set of such 3D frameworks, one half of the monomer (CdL)(1/2) as the building unit forms double antiparrel helical chains which are further bridged together by other (CdL)(1/2) units from adjacent helical chains. All CdL units in 1 adopt Delta geometry. DMSO and water guest molecules are found in the gap of the interpenetrated frameworks.