Intramolecular Energy Transfer in a One-Dimensional Europium Tetracyanoplatinate

Abstract

The one-dimensional, polymeric compound (C15H11N3)Eu(H2O)2(NO3)(Pt(CN)4).CH3CN (1) has been shown to display an efficient donor-acceptor intramolecular energy-transfer (IET) process where ligand donors transfer energy to the Eu (III) acceptor. Single-crystal X-ray diffraction has been used to investigate the structural features of this compound in order to help understand the observed IET process. Crystallographic data: 1, monoclinic, space group P2(1)/c, a = 12.835(1) A, b = 15.239(1) A, c = 13.751(2) A, beta = 105.594(9) degrees , V = 2590.8(5) A(3), and Z = 4 (T = 290 K).

Lanthanide Photoluminescence in Heterometallic Polycyanidometallate-Based Coordination Networks

“…Following the promising optical properties of 3D Ln III –[Pt II (CN) 4 ] 2− networks, a considerable number of the related d–f cyanido-bridged coordination polymers revealing photoluminescent functionalities were reported (Table 2) [80,81,82,83,84,85,86,87,88]. The insertion of 2,2’:6’2”-terpyridine (terpy) into the self-assembled Ln III –Pt II system resulted in the one-dimensional [Ln III (terpy)(H 2 O) 2 (NO 3 )][Pt II (CN) 4 ]· n (solvent) (Ln = Eu, Tb) zig-zag chains (Figure 4a) [81,87].…”

“…The insertion of 2,2’:6’2”-terpyridine (terpy) into the self-assembled Ln III –Pt II system resulted in the one-dimensional [Ln III (terpy)(H 2 O) 2 (NO 3 )][Pt II (CN) 4 ]· n (solvent) (Ln = Eu, Tb) zig-zag chains (Figure 4a) [81,87]. Under UV light excitation of various wavelengths, the EuPt chains exhibits exclusively the sharp emission peaks assigned to Eu III which clearly indicates the efficient dual acceptor–donor intramolecular energy transfer from both terpy ligand and [Pt II (CN) 4 ] 2− ions to 4f metal centre (Figure 4b) [81]. On the contrary, the TbPt chains shows the dual visible photoluminescence, the green 4f-centred and the blue [Pt II (CN) 4 ] 2− - based emission.…”

“…Colours for the structural diagram: Ln, red; Pt, dark blue; CN − , blue; terpy, orange; NO 3 − and H 2 O, grey. [81,87] Reprinted with permission from Inorg. Chem.…”

catena-Poly[[[diaqua(nitrato-κ2O,O′)(2,2′:6′,2′′-terpyridine-κ3N,N′,N′′)neodymium(III)]-μ-cyanido-κ2N:C-[dicyanidoplatinum(II)]-μ-cyanido-κ2C:N] acetonitrile solvate 2,2′:6′,2′′-terpyridine hemisolvate]

“…For related lanthanide tetracyanidoplatinate structures containing 2,2 0 :6 0 ,2 00 -terpyridine, see: Maynard et al (2008); ; . For structural and spectroscopic information on simpler lanthanide tetracyanidoplatinates, see: Gliemann & Yersin (1985); Holzapfel et al (1981).…”

“…The effort has focused on preparing lanthanide compounds that contain both tetracyanoplatinate(II) anions (TCP) and 2,2′:6′,2′′-terpyridine (tpy) ligands, since each of these ligands have been shown to act as sensitizers for various Ln 3+ cations (Gliemann & Yersin, 1985;Mukkala et al, 1995). We recently communicated some of our findings in this area (Maynard et al, 2008;. Through our efforts we have prepared a number of novel compounds incorporating various Ln 3+ cations, terpyridine, and TCP anions and have also recently reported on these structures (Maynard et al, 2008; (Maynard et al, 2008; or Ln = Ho and Yb (C 15 .…”