Thiacalixarene assembled heterotrinuclear lanthanide clusters comprising TbIII and YbIII enable f–f communication to enhance YbIII-centred luminescence

2016 ◽  
Vol 52 (15) ◽  
pp. 3139-3142 ◽  
Author(s):  
Ryunosuke Karashimada ◽  
Nobuhiko Iki
Keyword(s):  
Cluster Complexes ◽  
Lanthanide Cluster

A mixture of heterotrinuclear lanthanide cluster complexes, Tb3−xYbxTCAS2 (x = 1, 2), was obtained by mixing thiacalix[4]arene-p-tetrasulfonate (TCAS), TbIII, and YbIII, which shows enhanced YbIII-centred luminescence as compared to Yb3TCAS2, indicating f–f communication.

Transition metal and lanthanide cluster complexes constructed with thiacalix[n]arene and its derivatives

2007 ◽  
Vol 251 (13-14) ◽  
pp. 1734-1746 ◽  
Author(s):  
Takashi Kajiwara ◽  
Nobuhiko Iki ◽  
Masahiro Yamashita
Keyword(s):  
Transition Metal ◽  
Cluster Complexes ◽  
Lanthanide Cluster

Infrared spectroscopy of unsupported metal cluster complexes using multiple photon dissociation

1986 ◽  
Vol 85 (2) ◽  
pp. 1198-1199 ◽  
Author(s):  
M. R. Zakin ◽  
R. O. Brickman ◽  
D. M. Cox ◽  
K. C. Reichmann ◽  
D. J. Trevor ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Metal Cluster ◽  
Cluster Complexes

scholarly journals Do ultracompact dwarf galaxies form monolithically or as merged star cluster complexes?

2021 ◽  
Vol 502 (4) ◽  
pp. 5185-5199
Author(s):  
Hamidreza Mahani ◽  
Akram Hasani Zonoozi ◽  
Hosein Haghi ◽  
Tereza Jeřábková ◽  
Pavel Kroupa ◽  
...  
Keyword(s):  
Dwarf Galaxies ◽  
Initial Conditions ◽  
Mass Function ◽  
Star Cluster ◽  
Initial Mass Function ◽  
Central Mass ◽  
Cluster Complexes ◽  
V Band ◽  
Stellar Masses ◽  
The Imf

ABSTRACT Some ultracompact dwarf galaxies (UCDs) have elevated observed dynamical V-band mass-to-light (M/LV) ratios with respect to what is expected from their stellar populations assuming a canonical initial mass function (IMF). Observations have also revealed the presence of a compact dark object in the centres of several UCDs, having a mass of a few to 15 per cent of the present-day stellar mass of the UCD. This central mass concentration has typically been interpreted as a supermassive black hole, but can in principle also be a subcluster of stellar remnants. We explore the following two formation scenarios of UCDs: (i) monolithic collapse and (ii) mergers of star clusters in cluster complexes as are observed in massively starbursting regions. We explore the physical properties of the UCDs at different evolutionary stages assuming different initial stellar masses of the UCDs and the IMF being either universal or changing systematically with metallicity and density according to the integrated Galactic IMF theory. While the observed elevated M/LV ratios of the UCDs cannot be reproduced if the IMF is invariant and universal, the empirically derived IMF that varies systematically with density and metallicity shows agreement with the observations. Incorporating the UCD-mass-dependent retention fraction of dark remnants improves this agreement. In addition, we apply the results of N-body simulations to young UCDs and show that the same initial conditions describing the observed M/LV ratios reproduce the observed relation between the half-mass radii and the present-day masses of the UCDs. The findings thus suggest that the majority of UCDs that have elevated M/LV ratios could have formed monolithically with significant remnant-mass components that are centrally concentrated, while those with small M/LV values may be merged star cluster complexes.

Surface modification of silica nanoparticles by hexarhenium anionic cluster complexes for pH-sensing and staining of cell nuclei

2021 ◽  
Vol 594 ◽  
pp. 759-769
Author(s):  
Alsu Khazieva ◽  
Kirill Kholin ◽  
Irek Nizameev ◽  
Konstantin Brylev ◽  
Ilya Kashnik ◽  
...  
Keyword(s):  
Surface Modification ◽  
Silica Nanoparticles ◽  
Ph Sensing ◽  
Cell Nuclei ◽  
Cluster Complexes ◽  
Anionic Cluster

The chemistry of metal cluster complexes.

Polyhedron ◽  
1991 ◽  
Vol 10 (17) ◽  
pp. 2085-2086
Author(s):  
Cotton Simon
Keyword(s):  
Metal Cluster ◽  
Cluster Complexes
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