Neutral, flexible ditopic phosphine
(P–P) or phosphine oxide
(O=P–P=O) donors, rigid anionic bis-chelating
oxygen donors, and Re
2
(CO)
10
were used to assemble
ten phosphine oxide (P=O)-donor-based neutral monocyclic M
2
LL′-, bicyclic M
4
L
2
L″-,
and bicyclic M
4
LL′
2
-type supramolecular
coordination complexes (SCCs). A soft ditopic phosphine donor was
transformed into a hard ditopic phosphine oxide donor, during the
formation of the cyclic complexes
1
–
3
,
5
–
6
, and
9
–
10
. Complexes
4
,
7
, and
8
were obtained using a hard P=O donor ligand. These SCCs were
characterized using elemental analysis, FTIR, NMR, and single-crystal
X-ray diffraction analysis. The absorption properties of
1
–
8
were studied using absorption UV–vis
spectroscopic methods, and the results were analyzed using theoretical
calculations. The results revealed that the neutral P=O donor significantly influenced
the photophysical
properties by enhancing the absorption coefficient in the visible
region.