Two independent, 1-D metal-organic nanotubes based on rings or helical chain units

摘要

Three coordination polymers {[Mn(bte)(NO_2-l,3-bdc)(H_2O)]H_2O}_n (1), {[Mn(btp)(NO_2-l,3-bdc) (H_2O)]2H_2O}_n (2), and {[Mn(btb)(NO_2-l,3-bdc)(H_2O)]-H_2O}_n (3) (bte, 1,2-bis( 1,2,4-triazol-1 -yl) ethane; btp, l,3-bis(l,2,4-triazol-l-yl)propane; btb, l,4-bis(l,2,4-triazol-l-yl)butane, NO_2-1,3-H2bdc, 5-nitroisophthalic acid) were synthesized by combination of bte, btp, and btb, conformation-ally flexible ligands with different spacer lengths, and the rigid [NO_2-l,3-bdc]~(2-). In 1, two [NO_2-l,3-bdc]~(2-) anions link adjacent [Mn_2(bte)_2] rings to give an independent, 1-D metal-organic nano-tube (MONT). The structure of 2 is an undulating 2-D (4,4) network. In 3, the combination of a [Mn(btb)]_n single helical chain and two [Mn(NO_2-l,3-bdc)]_n linear chains assemble an intriguing independent, 1 -D MONT. An interesting structural feature of 1 and 3 is that the nitro groups of each 1 -D MONT interpenetrate into two adjacent 1 -D MONTs to form a 1 -D -> 2-D interdigitated array. 3-D architectures in 1 and 3 are assembled via hydrogen bond interactions. The luminescent properties and thermal stabilities of 1, 2, and 3 were investigated.