Two novel platinum quaterpyridine complexes have been synthesized and characterized by *H NMR spectroscopy and X-ray crystallography: [Pt(pQP)](C104)2 (pQP = 3",5,5/,5'"-tetramethyl-2,2':6/,2'/:6",2",-quaterpyridine), monoclinic C2/c, a = 14.276 (2) k,b = 12.970 (2) k,c= 14.257 (1) A, ß = 102.29 (1)°, V = 2579.2 (6) A3, Z = 4; [Pt(QP)](C104)2 (QP = 2,2,:6',2,,:6",2",-quaterpyridine), monoclinic P2U a = 5.904 (3) k,b= 12.943 (2)A, c = 14.300 (4) A, ß = 100.70 (4)°, V = 1073.7 (6) A3, Z = 2. The shortest intermolecular Pt-Pt distances in [Pt(pQP)](C104)2 and [Pt(QP)](ClÓ4)2 are 7.249 (2) and 5.904 A, respectively. Both complexes exhibit photoluminescence in the solid state at 700 nm. Only [Pt(pQP)]2+ shows room-temperature emission in acetonitrile

30 mL) was stirred with MgClz (120 mg, 1.26 mmol) for 24 h at room temperature. The mixture was filtered and the solvent removed under reduced pressure, giving (v3-HB(3-Butpz)3)MgC1 (35 mg, 61%).Reaction of (q3-HB(3-Butpz)3)M&H3 with TlCl. A solution of (~~-HB(3-Butpz)~lMgCH~ (60 mg, 0.14 mmol) in EhO (30 mL) was stirred with TlCl (170 mg, 0.71 mmol) for 18 h at room temperature. The mixture was filtered and the solvent removed under reduced pressure, giving starting material (s3-HB(3-X-ray Structure Determinations. Details of the crystal data, data collection, and refinement parameters are available as supplementary material.Butpz)3JMgCH3.

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