Synthesis and some properties of tetra[?5-cyclopentadienyldi-carbonylrheniummercury]

Kinetics of Crystallization in Polydisperse Emulsions

“…4 visualize the effect of the droplet size dispersity by displaying the N(t) and ␣(t) dependences [21] and [22] at a ϭ 1, 2, 5, and 50 (as indicated). In the a ϭ 1 case the dispersity in the droplet size is considerably greater than that in the a ϭ 50 case (at b ϭ 3, according to [11], w ϭ 0.97r m and 0.16r m in the two cases, respectively). Hence, because of the presence of a greater number of both smaller and larger droplets in the emulsion, curves 1 are more deformed than curves 50 in comparison with the dotted curves which correspond to the respective monodisperse emulsion of r m -sized droplets.…”

“…[11], the droplet size distribution Z(r) is wider for smaller values of a and/or b (see also Fig. 3).…”

“…Figure 3 depicts w from [11] as a function of a at b ϭ 1, 2, 3, 10, and 50 (as indicated) and illustrates the vanishing of w at a ϭ ϱ. Looking back at Figs.…”

“…Since in practice emulsions are polydisperse, i.e. they consist of droplets of various sizes, there is a need of a theory which, in line with Turnbull's (8) and later (11,12) studies, describes more comprehensively the kinetics of crystallization in emulsions by allowing explicitly for the size distribution of the emulsion droplets. This distribution can be expected to have an effect when it is sufficiently wide, because then, due to the dependence of the nucleation rate on the droplet size, the larger droplets will crystallize considerably more rapidly than the smaller ones.…”

Crystal chemistry of compounds containing mercury in low oxidation states

“…The four-membered virtually planar Hg 4 ring (the Hg7Hg7Hg bond angle is 90 8) was also found in the [(Z 5 -C 5 H 5 Re(CO) 2 Hg] 4 cluster with an analogous structure. 117 The rhenium atoms are alternately located above and below the plane of the mercury square. The average angle of bend of the angular HgReHg fragments is 19.0 8.…”