The treatment of phenylboronic acid PhB(OH) 2 with 4,4 0 -bipyridine (4,4 0 -bpy) in a 3:1 ratio afforded adduct [(Ph 3 B 3 O 3 )(g 1 -4,4 0 -bpy)] (1), whereas the reaction of PhB(OH) 2 with 4,4 0 -bpy in a 6:1 ratio afforded adduct [(Ph 3 B 3 O 3 ) 2 (l-4,4 0 -bpy)] (2). Similarly, the reaction of PhB(OH) 2 with trans-1,2-bis(4-pyridyl)ethylene (bpe) in a 6:1 ratio gave bpe bridged adduct [(Ph 3 B 3 O 3 ) 2 (l-bpe)] (3). The crystal structures of 1ÁC 6 H 6 , 2Á2C 7 H 8 , 2ÁC 6 H 14 , and 3ÁC 6 H 6 , along with other spectroscopic properties are reported. The weak NÁÁÁH-C hydrogen-bonds exist in the one-dimensional chains of 1ÁC 6 H 6 . Graphical Abstract Treatment of PhB(OH) 2 with 4,4 0 -bpy or bpe under different conditions afforded three new adducts [(Ph 3 B 3 O 3 )(g 1 -4,4 0 -bpy)] (1), [(Ph 3 B 3 O 3 ) 2 (l-4,4 0 -bpy)] (2) and [(Ph 3 B 3 O 3 ) 2 (l-bpe)] (3) through the B-N dative bonds.

No abstract

Two new organically templated borates, [(1,10-phen)(H3BO3)2] (1) and [2-EtpyH][(B5O6(OH)4] (2), were synthesized under mild solvothermal conditions and characterized by single-crystal X-ray diffraction, FT-IR, elemental analyses and thermogravimetry. Complex 1 is a co-crystal component in which B(OH)3 molecules form crinkled tapes via hydrogen bonds, which in turn are packed in a two-dimensional framework with 1,10-phen molecules sandwiched between the framework of crinkled chains. The structure of complex 2 is composed of 2-ethylpyridinium cations [2-EtpyH]+ and pentaborate anions [B5O6(OH)4]– which are linked together with hydrogen bonds to form a three-dimensional supramolecular framework. The templating [2-EtpyH]+ cations are situated in the cavities arising from the supramolecular pentaborate framework and interact also with the inorganic framework through hydrogen bonds.

In the title complex, [CuCl(C14H12N4)2], the CuI atom, lying on a twofold rotation axis, is coordinated by two N atoms of two 1,2,3,4-tetra­hydro-1,4,6,11-tetra­aza­naphthacene ligands and one Cl atom, also lying on the twofold rotation axis, in a distorted trigonal-planar geometry. The complex mol­ecules are connected into a one-dimensional structure along [001] via N—H⋯N hydrogen bonds and further into a three-dimensional structure via N—H⋯Cl hydrogen bonds. π–π inter­actions between the pyrazine and benzene rings and between the benzene rings [centroid–centroid distances = 3.5635 (15) and 3.9128 (16) Å] are present.

Crystals of [Na2(H2O)3] [B5O8(OH)2] (I) are grown from stoichiometric aq.