A luminescent cationic iridium complex with a 2,2'-biimidazole ligand forms hydrogen-bonded 1 : 1 adducts with benzoate anions; photoexcitation of the metal complex in presence of 3,5-dinitrobenzoate triggers a proton-coupled electron transfer.

Herein we report the synthesis and optoelectronic characterisation of three deep blue-emitting cationic iridium complexes, of the form [Ir(dFppy)(2)(N^N)]PF(6), bearing biimidazole-type N^N ancillary ligands (dFppyH = 2-(2,4-difluorophenyl)pyridine). Complex 1 contains the parent biimidazole, biim, while 2 contains a dimethylated analog, dMebiim, and 3 contains an ortho-xylyl-tethered biimidzol...

A theoretical-guided design concept aiming to achieve highly efficient unidirectional charge transfer and multi-charge separation upon successive photoexcitation for light-harvesting dyes in the scope of supramolecular photocatalysts is presented. Four 4H-imidazole-ruthenium(ii) complexes incorporating a biimidazole-based electron-donating ligand sphere have been designed based on the well-know...

In the title compound, C(6)H(6)N(4)·2C(7)H(6)O(2), the asymmetric unit contains a half-mol-ecule of biimidazole and one benzoic acid mol-ecule. The unit cell contains two biimidazole mol-ecules and four benzoic acid mol-ecules, giving the reported 2:1 ratio of benzoic acid to biimidazole. The biimidazole mol-ecule is located on an inversion center (passing through the central C-C bond). Strong ...

Three new inorganic-organic hybrid compounds based on Strandberg-type anions and Zn(ii)-H2biim/H2O subunits, namely {H4(H2biim)3}[Zn(H2biim)(H3biim)(H2O)(HP2Mo5O23)]2·3H2O (1), {H9(H2biim)7}[(μ-biim){(Zn(H2O)2)0.5(HP2Mo5O23)}2]·7H2O (2) and {H7(H2biim)7}[Zn(H2biim)(H2O)2(HP2Mo5O23)][H2P2Mo5O23]·8H2O (3) (H2biim = 2,2'-biimidazole), have been synthesized in aqueous solutions and characterized. T...

Combining a sterically bulky, electron-deficient 2-(2,4-difluorophenyl)-4-(2,4,6-trimethylphenyl)pyridine (dFMesppy) cyclometalating C∧N ligand with an electron rich, highly rigidified 1,1'-(α,α'-o-xylylene)-2,2'-biimidazole (o-xylbiim) N∧N ligand gives an iridium complex, [Ir(dFMesppy)2(o-xylbiim)](PF6), that achieves extraordinarily bright blue emission (ΦPL = 90%; λmax = 459 nm in MeCN) for ...

New imidazole ring derivatives comprising 1,3-oxazoline, Schiff's bases, thiadiazole, oxadiazole and 1,2,4-triazole moieties are reported. 3-Aminobiimidazol-4-one compounds 7a-c were synthesized by the reaction of compounds 6a-c with hydrazine hydrate. Biimidazole esters 9a-c were converted into biimidazole hydrazide esters 10a-c. Compounds 7a-c and 10a-c were converted into a variety of deriva...

In the title salt, [Cu(NCS)(C(6)H(6)N(4))(2)]Cl, the Cu(II) atom adopts a five-coordinated square-pyramidal geometry consisting of an N atom from a thio-cyanate anion and four N atoms from two chealting biimidazole ligands. The thio-cyanate ligand occupies the axial position and is, like the Cu(II) centre, located on a mirror plane. The cation and anion are linked into a linear chain by N-H⋯S a...

In the title adduct, C(7)H(5)NO(4)·0.5C(6)H(6)N(4), the complete biimidazole molecule is generated by a crystallographic inversion centre. In the crystal, N-H⋯O and O-H⋯N hydrogen bonds connects the 4-nitro-benzoic acid and 2,2'-biimidazole units, affording multi-dimensional frameworks with graph-set descriptor R(2) (2)(9).