The title compound {systematic name: poly[[aqua-lithium]-μ-3,3,8,8-tetra-methyl-1,4,6,9-tetra-oxa-5λ(4)-borataspiro-[4.4]nonane-2,7-dione]}, [Li(C(8)H(12)BO(6))(H(2)O)](n) (LiBMLB), forms a 12-membered macrocycle, which lies across a crystallographic inversion center. The lithium cations are pseudo-tetra-hedrally coordinated by three methyl-lactate ligands and a water mol-ecule. The asymmetric ...

In the centrosymmetric tetra-nuclear title compound, [Cu(4)I(4)(C(10)H(8)N(2)S(2))(2)], there are two different Cu(I) atoms with tetra-hedral coordination geometries. One is chelated by a pyridine N atom and an S-donor from one di-2-pyridyl disulfide ligand and coordinated by two I atoms, while the second Cu(I) atom is coordinated by a pyridine-N and three I atoms. Iodine bridges between the Cu...

In the title complex, [PdBr(2)(C(13)H(18)N(2))(2)], the Pd(II) atom is situated on an inversion center. The tetra-hydro-pyrimidine group of the N-(2,4,6-trimethyl-phen-yl)-1,4,5,6-tetra-hydro-pyrimidine ligand is twisted from the square (PdN(2)Br(2)) coordination plane with a C-N-Pd-Br torsion angle of 81.8 (4)°; this is different from the angle of 43.47 (14)°, reported in a closely related str...

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)](C(8)H(7)O(2))(2)·H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a Jahn-Teller-type of tetra-gonally distorted octa-hedral geometry. The cations, anions and lattice water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds to for...

The title compound, [Mn(C(4)H(3)N(8))(2)(H(2)O)(4)]·2H(2)O, represents the first structurally characterized transition metal complex of the 1,2-bis-(tetra-zol-5-yl)ethene ligand. The complex mol-ecule occupies a special position on an inversion centre and the Mn atom has a tetra-gonally distorted octa-hedral coordination. The bis-(tetra-zolyl)ethene ligand is planar within 0.0366 (7) Å. All 'ac...

In the crystal structure of the title compound, [Mg(CHN(4))(2)(H(2)O)(4)], the Mg(II) atom is six-coordinated by two N atoms from two tetra-zolide anions and four O atoms from four coordinated water mol-ecules in a slightly distorted octa-hedral geometry. The Mg atom is located on centres of inversion whereas the tetra-zolide anion and the water mol-ecules occupy general positions. The crystal ...

The tetra (Gymnocorymbus ternetzi) exhibits two phenotypes associated with trunk banding. Fish possess either a smoky-gray coloration with two prominent black vertical bands located directly behind the operculum (black tetra) or a lighter coloration and lack these bands (white skirt tetra). Segregation patterns observed from the progenies of 11 different crosses suggest that the inheritance of ...

Pyrimidine-purine DNAs with repeating sequences can be made to undergo a reversible transition to possibly a tetra-stranded complex. Physicochemical characterization of the new structures and model building are consistent with, in the case of d(TC)n-d(GA)n, a tetra-stranded complex forming by the addition of d(GA)n to the remaining space in the major groove of the triple-stranded complex d(TC)n...

The title compound, {[Cu(2)I(2)(C(12)H(8)N(6))(C(18)H(15)P)(2)]·2CH(3)CN}(n), contains centrosymmetric dinuclear Cu(2)I(2)(PPh(3))(2) units bridged by 3,6-bis-(4-pyrid-yl)-1,2,4,5-tetra-zine ligands lying also across crystallographic inversion centers, giving a chain structure in the ab plane. The distorted tetra-hedral Cu(I) atoms in the dinuclear unit are coordinated by two bridging iodide an...

The title compound, [Zn2(C8F4O4)2(C4H8O)2] n , has a three-dimensional metal-organic framework structure. The asymmetric unit consists of two Zn(II) atoms, two tetrahydrofuran ligands, one 2,3,5,6-tetra-fluoro-benzene-1,4-di-carboxyl-ate ligand and two half 2,3,5,6-tetra-fluoro-benzene-1,4-di-carboxyl-ate ligands, which are completed by inversion symmetry. One Zn(II) atom has a distorted trigon...