“…In binuclear complexes of naphthyridine (Munakata, Maekama, Kitegawa, Adachi & Masuda, 1990), 1,2,4-triazole and 2-aminoquinoline (Schmidbaur, Mair, Miiller, Lachmann & Gamper, 1991), unidentate coordination of a nitrate or perchlorate anion to Ag is weak but significant and distorts the primary linear coordination towards trigonal, with a correlation among Ag--N and Ag--O distances and the N--Ag--N angle. In complexes containing two or more silver(I) atoms with a primary linear or almost linear coordination by two N atoms, Ag-..A8 distances have been found ranging upwards from 2.65 A, many of them considerably shorter than that in the present structure and interpreted as direct metal-metal bonding (Beck & Str'~ihle, 1986;Hass & Bergerhoff, 1974;Hartmann & Str'~ihle, 1988, 1990Eastland, Mazid, Russell & Symons, 1980;Fenske, Baum, Zinn & Dehnicke, 1990;Tsuda, Ohba, Takahashi & Ito, 1989;Hartmann, Schmid & Str/ihle, 1989;van Stein, van Koten, Blank, Taylor, Vrieze, Spek, Duisenberg, Schreurs, Kojic Prodic & Brevard, 1985;Cotton, Feng, Matusz & Poli, 1988;Munakata, Maekama, Kitagawa, Adachi & Masuda, 1990).…”