The complex [Cu(en) 2 (H 2 O)](sy) 2 (en)(H 2 O) 2 has been synthesized and characterized by its electronic and vibrational spectra. The molecular structure of the complex has been determined by X-ray diffraction methods. The complex crystallizes in the orthorhombic space group Pnma with unit-cell parameters a = 10.7236 (5), b = 20.4660(10), c = 14.4523(11)Å and Z = 4. In the cation, the Cu(II) ion has a distorted square pyramidal coordination with two bidendate (en) ligands forming the basal plane and a H 2 O molecule in the apical position. The complex cations and syringate anions constitute chains along the b axis in -A-B-A-fashion. The members of the chains are linked by through N-H···O hydrogen bonds. The (en) molecules are responsible for connecting adjacent layers.
In the title salt, (C(6)H(8)N(4))[Mn(C(14)H(8)O(4))(2)(C(6)H(6)N(4))(2)]·6H(2)O, the Mn(II) atom lies on an inversion centre and is coordinated by four N atoms from two 2,2'-biimidazole (biim) ligands and two O atoms from two biphenyl-2,4'-dicarboxylate (bpdc) anions to give a slightly distorted octahedral coordination, while the cation lies about another inversion centre. Adjacent [Mn(bpdc)(2)(biim)(2)](2-) anions are linked via two pairs of N-H...O hydrogen bonds, leading to an infinite chain along the [100] direction. The protonated [H(2)biim](2+) moiety acts as a charge-compensating cation and space-filling structural subunit. It bridges two [Mn(bpdc)(2)(biim)(2)](2-) anions through two pairs of N-H...O hydrogen bonds, constructing two R(2)(2)(9) rings, leading to a zigzag chain in the [2-1-1] direction, which gives rise to a ruffled set of [H(2)biim](2+)[Mn(bpdc)(2)(biim)(2)](2-) moieties in the [01-1] plane. The water molecules give rise to a chain structure in which O-H...O hydrogen bonds generate a chain of alternating four- and six-membered water-oxygen R(4)(2)(8) and R(6)(6)(12) rings, each lying about independent inversion centres giving rise to a chain along the [100] direction. Within the water chain, the (H(2)O)(6) water rings are hydrogen bonded to two O atoms from two [Mn(bpdc)(2)(biim)(2)](2-) anions, giving rise to a three-dimensional framework.
The asymmetric unit of the title two-dimensional coordination polymer, {[Cd(C(14)H(8)O(4))(C(14)H(14)N(4))]·0.15H(2)O}(n), is composed of one Cd(II) cation, one biphenyl-2,4'-dicarboxylate (bpdc) anion, one 1,4-bis(imidazol-1-ylmethyl)benzene (bix) ligand and 0.15 solvent water molecules. The coordination environment of the Cd(II) cation is defined by four carboxylate O atoms from two different bpdc anions in a chelating mode and two N atoms from two distinct bix ligands, constructing a distorted trigonal prism polyhedron. Two inversion-related Cd(II) cations are bridged together by two positionally disordered bpdc anions, forming a 22-membered ring with a Cd...Cd distance of 9.1966 (9) Å. These rings are then further linked by two bix ligands, extending into a two-dimensional layer along (102) with 6(3) topology.
The title complex [Co(C 7 H 8 N 5 S) 2 ]·2H 2 O has been synthesized and characterized by IR and UV spectral studies. The structure of the compound has been determined by single-crystal X-ray diffraction. The complex consists of discrete monomeric molecules with octahedrally hexacoordinate cobalt(II) ions, where two acetylpyrazine thiosemicarbazones act as NNS tridentate ligands coordinated to the central cobalt atom via the pyrazine nitrogen, azomethine nitrogen and sulfur atoms. Hydrogen bonds link the different components to stabilize the crystal structure. The antitumor activity of the title complex was tested against A549 lung cancer cell line. The complex exhibited lower antitumor activity, as compared to the free ligand.
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