Phototropy of N, N-Dimethylaminoazobenzene in n-Hexane

MNDO Study of Nitrogen Atom Inversion in Piperazine, N,N'-Dimethylpiperazine and N,N'-Dichloropiperazine

MNDO semi-empirical SCF MO calculations are used to study the pyramidal nitrogen atom inversion and configurational equilibria in the title compounds.

[μ-N,N,N′,N′-Tetra­kis(2-pyridylmeth­yl)­hexane-1,6-diamine]bis­[dichlorido­manganese(II)]

The asymmetric unit of the title compound, [Mn(2)Cl(4)(C(30)H(36)N(6))], contains one-half of the formula unit; a centre of inversion is located at the mid-point of the mol-ecule. The two Mn(2+) ions are bridged by the dual tri-dentate N,N,N',N'-tetra-kis(2-pyridylmeth-yl)hexane-1,6-diamine ligand to form a dinuclear complex. Each Mn atom is five-coordinated in an approximately square-pyramidal...

$n$-cocoherent rings‎, ‎$n$-cosemihereditary rings and $n$-V-rings

 Let $R$ be a ring‎, ‎and let $n‎, ‎d$ be non-negative integers‎. ‎A right $R$-module $M$ is called $(n‎, ‎d)$-projective if $Ext^{d+1}_R(M‎, ‎A)=0$ for every $n$-copresented right $R$-module $A$‎. ‎$R$ is called right $n$-cocoherent if every $n$-copresented right $R$-module is $(n+1)$-coprese-nted‎, ‎it is called a right co-$(n,d)$-ring if every right $R$-module is $(n‎, ‎d)$-projective‎. ‎$R$...

n-Hexane metabolism in occupationally exposed workers.

Lung uptake and excretion of n-hexane were studied in ten workers in a shoe factory. Simultaneous samples of inhaled and alveolar air were collected with the aid of a Rhan-Otis valve, personal samplers, and charcoal tubes. Alveolar excretion was monitored during a six hour postexposure period. Uptake was calculated from lung ventilation, the retention coefficient, and environmental concentratio...

Molecular dynamics simulations of the surface tension of n-hexane, n- decane and n-hexadecane