Wei-Li Shang

Synthesis, crystal structure and luminescent properties of one coordination polymer of cadmium(II) with mixed thiocyanate and hexamethylenetetramine ligands

A novel Cd(II) coordination polymer [Cd(SCN)(2)(hmt)(1/2)(H(2)O)](2).H(2)O (hmt=hexamethylenetetramine) has been synthesized and characterized by IR, elemental analysis, TG technique and X-ray crystallography. Cd(II) atom has an distorted octahedral environment with an N(3)S(2)O donor set. Every six Cd(II) centers are linked by hmt and thiocyanato bridges to form a planar 2D coordination polymer containing hexagonal metallocyclic rings [Cd(6)(SCN)(8)(hmt)(2)]. A 2D layer structure is held together with its neighboring ones via a set of hydrogen-bonding interactions to form a 3D supramolecular structure. The luminescent properties of the title complex in the solid state were investigated.

A series of metal–organic frameworks based on polydentate Schiff-base ligands derived from benzil dihydrazone: synthesis, crystal structures and luminescent properties

A series of metal–organic frameworks {[AgL1]ClO4}n (1), {[AgL12]BF4}n (2), {[AgL1(NO3)](CH3CH2OH)}n (3), {[ZnL12(NCS)2]CH3CN}n (4), [AgL2(NO3)]n (5), {[FeL22Cl2]·CH3CN}n (6), {[MnL22(NCS)2]·(CH3CH2OH)}n (7) and [ZnL22(NCS)2]n (8) have been synthesized and structurally characterized by IR spectroscopy, UV spectroscopy, thermogravimetric (TG) analyses, luminescent spectroscopy and complete single-crystal structure analyses, where L1 is (N′,N′-bis[1-(pyridin-4-yl)methylidene]benzil dihydrazone) and L2 is (N′,N′-bis[1-(pyridin-3-yl)methylidene]benzil dihydrazone), respectively. The structure of 1 exhibits a two-dimensional layer network featuring trimetal 36-membered non-planar macrocycles. Polymer 2 is a one-dimensional chain structure with tetranuclear metallacyclic rings. For polymer 3, each ligand acts as a bidentate ligand to bind two Ag(I) centers and each silver center is coordinated to two N-donors from two ligands forming a one-dimensional chain. Polymer 4 displays a two-dimensional layer network containing tetranuclear 68-membered metallocyclic rings. Polymers [AgL2(NO3)]n (5), {[FeL22Cl2]·CH3CN}n (6), {[MnL22(NCS)2]·(CH3CH2OH)}n (7) and [ZnL22(NCS)2]n (8) show all one-dimensional chain structures containing bimetallic 8-membered rings and tetrametallic 42-membered rings for 5, bimetallic 34-membered quadrangular rings for 6 and 7, and bimetallic 30-membered quadrangular rings for 8, respectively. The luminescent properties of L1, L2 and 1–8 in the solid state were investigated.

Aqua­(hexa­methyl­enetetra­mine-κN)bis­(methanol-κO)bis­(thio­cyanato-κN)cobalt(II)

In the title complex, [Co(NCS)2(C6H12N4)(CH4O)2(H2O)], the six-coordinated Co atom has a slightly distorted octahedral geometry. The molecules are linked by intermolecular O—H⋯S and O—H⋯N hydrogen bonds, forming a three- dimensional crystal structure. Intramolecular C—H⋯N and C—H⋯O hydrogen bonds are also present.