N-doped carbon dots as robust fluorescent probes for the rapid detection of hypochlorite.

Great advances have been made in the development of carbon dot (CD)-based fluorescent materials for the detection of hypochlorite in the past few years. However, developing new CDs with high quantum yield (QY) for the rapid detection of hypochlorite and gaining a deeper insight into the detection mechanism still need to be further investigated. Herein, N-doped carbon dots (NCDs) with high QYs, which can reach as high as 67%, were efficiently prepared employing citric acid and -phenylenediamine as raw materials.

Urea-doped carbon dots as fluorescent switches for the selective detection of iodide ions and their mechanistic study.

A facile and green strategy for the fabrication of fluorescent urea-doped carbon dots (N-CDs) has been explored. Significantly, the fluorescent N-CDs could recognize iodide ions (I) with high selectivity, and their photoluminescence could be efficiently quenched by the addition of I. The sensitivity analysis for I indicated a linear relationship in the range from 12.

Propane-1,2-diaminium bis-(4-meth-oxy-benzoate).

The asymmetric unit of the title salt, C(3)H(12)N(2) (2+)·2C(8)H(7)O(3) (-), contains two 4-meth-oxy-benzoate anions and one propane-1,2-diaminium cation. All the amino H atoms of the cation are involved in N-H⋯O hydrogen bonds with the carboxyl-ate O atoms of the anions.

catena-Poly[(S)-2-methyl-piperazine-1,4-diium [[trichloridobismuthate(III)]-di-μ-chlorido]].

In the crystal structure of the title compound, {(C(5)H(14)N(2))[BiCl(5)]}(n), the Bi(III) cation is coordinated by six Cl(-) anions in a distorted octa-hedral geometry. Two Cl(-) anions bridge neighboring Bi(III) cations, forming a zigzag polymeric chain along the a axis. The discrete methylpiperazinediium cation adopts a normal chair conformation and is linked to the polymeric chains by N-H⋯Cl hydrogen bonding.

(S)-1,2,4-Trimethyl-piperazine-1,4-diium tetra-chloridozincate(II).

In the title compound, (C(7)H(18)N(2))[ZnCl(4)], the Zn atom adopts a slightly distorted tetra-hedral geometry. The diprotonated piperazine ring adopts a chair conformation. In the crystal structure, the cations and anions are linked by inter-molecular N-H⋯Cl hydrogen bonds into a chain along [001].

3,5-Dichloro-N-(2-methyl-but-3-yn-2-yl)benzamide.

In the title compound, C(12)H(11)Cl(2)NO, the amide group is twisted by a dihedral angle of 31.98 (2)° with respect to the benzene ring. In the crystal structure, mol-ecules are linked via N-H⋯O hydrogen bonds, forming one-dimensional supra-molecular chains.

Methyl 1-bromo-2-naphthoate.

In the mol-ecular structure of the title compound, C(12)H(9)BrO(2), the methoxy-carbonyl group is twisted by a dihedral angle of 29.8 (3)°with respect to the naphthalene ring system. An overlapped arrangement is observed between parallel naphthalene ring systems of adjacent mol-ecules, and the face-to-face distance of 3.

Bis(2-amino-benzonitrile)tetra-aqua-cobalt(II) dichloride.

In the crystal structure of the title compound, [Co(C(7)H(6)N(2))(2)(H(2)O)(4)]Cl(2), the Co(II) cation lies on an inversion center and is coordinated by two 2-amino-benzonitrile ligands and four water mol-ecules in a distorted octa-hedral geometry. The Cl(-) counter-anion links with the complex cations via O-H⋯Cl and N-H⋯Cl hydrogen bonding. Inter-molecular O-H⋯N hydrogen bonding links the complex cations, forming supra-molecular chains running along the b axis.

4-Benzhydryl-1-cinnamylpiperazin-1-ium nitrate.

In the title compound, C(26)H(29)N(2) (+)·NO(3) (-), the dihedral angle formed by the phenyl rings of the benzhydryl group is 66.18 (9)°. Crystal cohesion is enforced by cation-anion C-H⋯O and N-H⋯O hydrogen bonds.