Supramolecular
one-step self-assembly of dimanganese decacarbonyl,
diaryl diselenide, and linear dipyridyl ligands (L = pyrazine (pz),
4,4′-bipyridine (bpy), and trans-1,2-bis(4-pyridyl)ethylene
(bpe)) has resulted in the formation of selenolato-bridged manganese(I)-based
metallorectangles. The synthesis of tetranuclear Mn(I)-based metallorectangles
[{(CO)3Mn(μ-SeR)2Mn(CO)3}2(μ-L)2] (1–6) was facilitated by the oxidative addition of diaryl diselenide
to dimanganese decacarbonyl with the simultaneous coordination of
linear bidentate pyridyl linker in an orthogonal fashion. Formation
of metallorectangles 1–6 was ascertained
using IR, UV–vis, NMR spectroscopic techniques, and elemental
analyses. The molecular mass of compounds 2, 4, and 6 were determined by ESI-mass spectrometry. Solid-state
structural elucidation of 2, 3, and 6 by single-crystal X-ray diffraction methods revealed a rectangular
framework wherein selenolato-bridges and pyridyl ligands define the
shorter and longer edges, respectively. Also, the guest binding capability
of metallorectangles 3 and 5 with different
aromatic guests was studied using UV–vis absorption and emission
spectrophotometric titration methods that affirmed strong host–guest
binding interactions. The formation of the host–guest complex
between metallorectangle 3 and pyrene has been explicitly
corroborated by the single-crystal X-ray structure of 3•pyrene. Moreover, select metallorectangles 1–4 and 6 were studied to explore
their anticancer activity, while CO-releasing ability of metallorectangle 2 was further appraised using equine heart myoglobin assay.
Rhenium tricarbonyl core based thiolato-bridged spiro-metallacyclic tetranuclear compounds of general formula [{(CO)3Re(μ-SR)2Re(CO)3}2(μ-ɳ⁴-ptpc)] (1−3) (R = phenyl (1), p-tolyl (2), and benzyl (3) were accomplished by the reaction of rudimentary Re2(CO)10,...
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