Molecular chemiluminescence spectra from selected alkali-halogen reactions are presented using a beam-gas arrangement operating with pressures between 10 -1 mtorr (single collision conditions) up to 10 mtorr in the reaction zone. Spectra are presented for the chemiluminescent reactions M2 + X 2 > M X * + MX, where M2 = K 2 , Na2 and X 2 = C12, Br2 ,12 . The MX* emitter is identified by comparis...

Copper(II) bromide and chloride complexes of the new heptadentate ligand 2,6-bis(bis(2-pyridylmethyl)amino)methylpyridine (L) have been prepared. For the bromide complexes, chains of novel, approximately C2-symmetric, chiral [Cu2(L)Br2]2+ 'wedge-shaped' tectons are found. The links between the dicopper tectons and the overall chirality and packing of the chains are dictated by the bromide ion c...

The reaction between hydrogen and chlorine shows resemblance to that between hydrogen and bromine but is considerably more complicated, owing to the larger number of elementary processes that play a significant part in it. The reaction scheme proposed for the hydrogen-chlorine reaction differs in several important respects from that for the hydrogen-bromine reaction. The main differences are se...

Let M2 be the moduli space that classifies genus 2 curves. If a curve C is defined over a field k, the corresponding moduli point P = [C] ∈ M2 is defined over k. In [7], Mestre solves the converse problem for curves with Aut(C) ≃ C2. Given a moduli point defined over k, Mestre finds an obstruction to the existence of a corresponding curve defined over k, that is an element in Br2(k) not always ...

Recent experiments by Lee et al. [Nature (London) 363, 255 (1997)] show that doping carbon singlewall nanotube (SWNT) ropes with K, Rb, or Br2 leads to metallic conductivity, but the structure and properties are not known. We used molecular dynamics to predict structures and properties which should help motivate and interpret experiments on SWNTyK. We find the optimum stoichiometry to be KC16 i...

Two new mixed-ligand copper(II) complexes, [Cu(dipn)(NN)]Br2(1-2) [dipn=dipropylenetriamine, NN=ethylenediamine (en) (1) and propylenediamine (pn) (2)], have been synthesized. These complexes were characterized by spectroscopic and thermal techniques. Crystal structure for 2 shows a distorted trigonal-bipyramidal geometry around Cu(II) ion with one solvate water molecule. Antimicrobial and anti...

Certain tissues contain unique factors which are chemotactic for metastatic tumor cell lines. Extracts of bone, brain, liver, and lung were tested for their ability to promote either the migration or the chemoinvasion, i.e., their penetration through a reconstituted basement membrane barrier, of various metastatic tumor cells. Using a modified Boyden chamber assay for chemotaxis, B16-Br2 melano...