The synthesis and characterization of macrocyclic Pd(II)/Pt(II) dimers and
their monomeric precursors with diphosphine spacer Ph2P-C=C-PPh2 (C2P2) are
reported. Their excited-state properties, including solvent-dependent abso
rption, emission and quantum yield, are studied. When the solvent polarity
increases, solvatochromic absorption band shifts to higher energy, emission
maximum shifts to lower energy, and quantum yield decreases. In addition,
the host-guest behavior of these new inorganic macrocycles is also reported
here. (C) 2000 Elsevier Science S.A. All rights reserved.