X. Wang et al., Anomalous heavy atom effect on optical limiting property of homoleptic double-decked sandwich-type lanthanide diphthalocyanines, OPT COMMUN, 197(1-3), 2001, pp. 83-87
Optical limiting (OL) performance of two homoleptic sandwich-type lanthanid
e diphthalocyanines. M[Pc(OC5H11)(8)](2) (M = Gd, Eu). was investigated via
fluence-dependent transmittance measurements. The measurements were perfor
med using collimated 10-ns pulses generated from a frequency-doubled Nd:YAG
laser at 532-nm wavelength. The results indicated that Eu[Pc(OC5H11)(8)](2
) exhibited better OL performance than Gd[Pc(OC5H11)(8)](2), which seems to
be contrary to the heavy atom effect because the gadolinium ion is heavier
than europium ion. A possible explanation was proposed that, not only the
atomic number but also the ion radius of the metal center would influence t
he OL performance of metal diphthalocyanines. (C) 2001 Elsevier Science B.V
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