Di-μ-chlorido-bis­({2-[(4-bromo­phen­yl)­imino­meth­yl]pyridine-κ2 N,N′}­chloridomercury(II))

The unique HgII ion in the title centrosymmetric dinuclear complex, [Hg2Cl4(C12H9BrN2)2], is in a distorted trigonal–bipyramidal coordination environment formed by the bis-chelating N-heterocyclic ligand, two bridging Cl atoms and one terminal Cl atom. One of the bridging Hg—Cl bonds is significantly longer than the other

Bromidotricarbon­yl[4-chloro-N-(2-pyridyl­methyl­idene)aniline-κ2 N,N′]rhenium(I)

In the title compound, [ReBr(C12H9ClN2)(CO)3], the ReI atom has a distorted octa­hedral configuration with the three carbonyl ligands showing a facial arrangement. The main distortion of the octa­hedron is due to a small bite angle of the chelating bidentate diimine ligand [N—Re—N = 75.3 (3)°]

Bis{2-[(4-bromo­phen­yl)imino­meth­yl]pyridine-κ2 N,N′}copper(I) tetra­phenyl­borate

In the crystal structure of the title compound, [Cu(C12H9BrN2)2](C24H20B), the copper(I) cation is coordinated by four N atoms of two crystallographically independent 2-[(4-bromo­phen­yl)imino­meth­yl]pyridine ligands within a distorted tetra­hedron

{2-[(4-Bromo­phen­yl)imino­meth­yl]pyridine-κ2 N,N′}diiodidozinc(II)

In the title compound, [ZnI2(C12H9BrN2)], the metal centre displays a moderately distorted tetra­hedral coordination geometry defined by two iodide anions and two N atoms of the organic ligand. The dihedral angle between the pyridine and benzene rings is 15.15 (13)°

Flow coupling during three-phase gravity drainage

We measure the three-phase oil relative permeability k(ro) by conducting unsteady-state drainage experiments in a 0.8 m water-wet sand pack. We find that when starting from capillary-trapped oil, k(ro) shows a strong dependence on both the flow of water and the water saturation and a weak dependence on oil saturation, contrary to most models. The observed flow coupling between water and oil is stronger in three-phase flow than two-phase flow, and cannot be observed in steady-state measurements. The results suggest that the oil is transported through moving gas-oil-water interfaces (form drag) or momentum transport across stationary interfaces (friction drag). We present a simple model of friction drag which compares favorably to the experimental data.University of Texas at AustinCenter for Frontiers of Subsurface Energy SecurityUS Department of Energy, Office of Basic Energy Sciences DE-SC0001114Petroleum and Geosystems Engineerin

N,N′-Bis(3-phenyl­allyl­idene)biphenyl-2,2′-diamine

In the title Schiff base, C30H24N2, the complete molecule is generated by a crystallographic twofold axis; the aromatic rings of the biphenyl unit are twisted by 60.78 (1)°. The imine double bond has a trans configuration