The title compound {systematic name: 2,2',2'',2'''-[3,7,11,15-tetra-aza-1(1,4),5(1,3),9(1,4),13(1,3)-tetra-benzena-cyclo-hexadeca-phane-3,7,11,15-tetra-yltetra-methyl-ene]tetra-benzonitrile}, C(64)H(56)N(8), is a centrosymmetric macrocycle that is consolidated into the crystal structure by C-H⋯π inter-actions.

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...

Methyl tetra - 0-methyl- ?-D- glucopyranoside is stereoselectively prepared from tetramethyl-D- glucopyranose by using (MeI+NaH) in toluene (86%) or cyclohexane (85%), while its ?- isomer is best synthesized in hexamethyl phosphoramide (64%). Similarly, methyl tetra-o-methyl-?- D-mannopyranoside is synthesized in cyclohexane (80%), while its ?- isomer is predominantly prepared by (MeI+n-Bu...

In the title complex, [Zn(2)(C(7)H(3)N(5)O(2))(2)(H(2)O)(6)], the 5-(5-carboxyl-ato-3-pyrid-yl)tetra-zolate ligand chelates the Zn(II) center through one pyridyl N and one tetra-zolate N atom, and uses another N atom to bridge to the second Zn atom, forming a centrosymmetric dinuclear unit. Three coordinated water mol-ecules complete the distorted octa-hedral geometry of the Zn(II) atom. O-H⋯O ...

In the crystal structure of the title salt, C16H36N(+)·CH3BN(-), the tetra-n-butyl-ammonium cations and [BH3(CN)](-) anions are connected via weak C-H⋯N inter-actions, forming chains along the b-axis direction. The anion is almost linear with an N-C-B angle of 178.7 (2)°. The C-N-C angle values at the core of the tetra-n-butyl-ammonium cation range from 105.74 (11) to 111.35 (11)° with an avera...

Functionalising 2,5-di(N,N'-carbazolyl)terephthalonitrile or 2,3,5,6-tetra(N,N'-carbazolyl)terephthalonitrile on the carbazole moiety with alkoxy chains, gives a family of materials that show TADF response; two them are also liquid crystalline.

In the mol-ecule of neutral bis-[(1H-tetra-zol-5-yl)meth-yl]nitramide, (I), C4H6N10O2, there are two intra-molecular N-H⋯O hydrogen bonds. In the crystal, N-H⋯N hydrogen bonds link mol-ecules, forming a two-dimensional network parallel to (-201) and weak C-H⋯O, C-H⋯N hydrogen bonds, and inter-molecular π-π stacking completes the three-dimensional network. The anion in the molecular salt, tri-am...

The article is devoted to hidden symmetries in long sequences of oligonucleotides of single stranded DNA. The notions of tetra-groups of oligonucleotides and also collective frequencies and collective probabilities of members of the tetra-groups are introduced to study hidden tetra-group regularities in mentioned sequences. Each of such tetra-group contains 4 members, each of which combines 4^(...

In the title compound, [Co(C(11)H(8)N(5)O)Cl](n), the Co(II) atom is penta-coordinated by one O atom and two N atoms from a 5-(8-quinolyloxymeth-yl)tetra-zolate ligand, one N atom from another symmetry-related ligand, and a Cl atom. The coordination geometry can be described as slightly distorted trigonal-bipyramidal. Adjacent Co atoms are connected by the bridging tetra-zole groups into a chai...