Three novel porous coordination polymers based on lead(II) and isonicotinic acid N-oxide, [Pb(INO)
2]
2·7H
2O (
1),[Pb(INO)
2]·
nH
2O (
2), and [Pb
4(OH)
4(INO)
4]·
nH
2O (
3) (HINO = isonicotinic acid
N-oxide), have been synthesized and characterizedthrough single-crystal X-ray diffraction. Compound
1 features a most remarkable and unique three-dimensional (3D) frameworkwith two distinct kinds of channels showing different sizes and shapes, which are occupied by two kinds of water clusters, accordingto the size and shape of the channels. Compound
2 possesses a 3D framework built up from one-dimensional (1D) Pb-O chains andINO ligands with 1D rectangular channels, in which lattice water molecules are located. The structure of
3 consists of [Pb
4(OH)
4]
4+cluster inorganic building blocks, which connect with
4-INO ligands through oxygen atoms from N-oxide moieties and carboxylategroups of INO to form 8.7 × 8.7 Å
2 rhombic channels running along the
c-axis. In addition, the photoluminescence properties ofcoordination polymers
1-
3 in the solid state have been reported. Gas adsorption properties of compound
3 have also been studied.