Identification and electronic characterization of four cyclodehydrogenation products of HTPP molecules on Au(111).

C-H bond activation and dehydrogenative coupling reactions have always been significant approaches to construct microscopic nanostructures on surfaces. By using scanning tunneling microscopy/spectroscopy (STM/STS) and non-contact atomic force microscopy (nc-AFM) combined with density functional theory (DFT), we systematically characterized the atomically precise topographies and electronic properties of H2TPP cyclodehydrogenation products on Au(111). Through surface-assisted thermal excitation, four types of cyclodehydrogenation products were obtained and clearly resolved in the nc-AFM images.

Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene.

We show that in gapped bilayer graphene, quasiparticle tunneling and the corresponding Berry phase can be controlled such that they exhibit features of single-layer graphene such as Klein tunneling. The Berry phase is detected by a high-quality Fabry-Pérot interferometer based on bilayer graphene. By raising the Fermi energy of the charge carriers, we find that the Berry phase can be continuously tuned from 2π down to 0.

Tailoring supercurrent confinement in graphene bilayer weak links.

The Josephson effect is one of the most studied macroscopic quantum phenomena in condensed matter physics and has been an essential part of the quantum technologies development over the last decades. It is already used in many applications such as magnetometry, metrology, quantum computing, detectors or electronic refrigeration. However, developing devices in which the induced superconductivity can be monitored, both spatially and in its magnitude, remains a serious challenge.

2-Amino-6-(naphthalen-1-yl)-4-phenyl-pyridine-3-carbonitrile.

In the title compound, C(22)H(15)N(3), the naphthyl ring system makes dihedral angles of 67.40 (2) and 59.80 (3)° with the pyridyl and phenyl rings, respectively.

Poly[di-μ(2)-chlorido-μ(2)-(1,4-dioxane-κO:O')-cadmium(II)].

In the title complex, [CdCl(2)(C(4)H(8)O(2))](n), two different Cd(II) ions are present, one in a general position and one with site symmetry 2. The Cd(II) ions are coordinated by two O atoms from two 1,4-dioxane ligands and four chloride anions in a slightly distorted octa-hedral geometry and is connected to neighboring Cd(II) ions by two bridging chloride anions, generating infinite linear chains along the a axis. These chains are further inter-connected by bridging 1,4-dioxane ligands, affording a three-dimensional network.

5-(4-Methyl-piperazin-1-yl)-2-nitro-aniline.

In the title compound, C(11)H(16)N(4)O(2), the dihedral angle between the benzene ring and the plane of the four carbon atoms in the piperazine ring is 12.17 (3)°; the latter ring adopts a chair conformation. An intramolecular N-H⋯O hydrogen bond generates an S(6) ring.

2-Amino-4-(2-fluoro-phen-yl)-5,6-dihydro-benzo[h]quinoline-3-carbonitrile.

In the title compound, C(20)H(14)FN(3), the F atom of the fluoro-substituted benzene ring in the 4-position of the 5,6-dihydro-benzo[h]quinoline system is disordered over two positions (0.80 and 0.20 occupancy).

4-Bromo-2-(4-fluoro-benzyl-idene)indan-1-one.

In the mol-ecule of the title compound, C(16)H(10)BrFO, the indane ring system is planar with a maximum deviation of 0.020 (3) Å. An intra-molecular C-H⋯O inter-action results in the formation of a planar ring, which is oriented at dihedral angles of 2.

2-Methyl-sulfanyl-4-(3-pyrid-yl)pyrimidine.

In the title compound, C(10)H(9)N(3)S, the dihedral angle between the aromatic rings is 8.09 (14)°. In the crystal, a C-H⋯N interaction links the molecules, forming chains.