Tetranuclear osmium complexes of tetracyanoquinodimethane TCNQ, 2,2'-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile) and 1,2,4,5-tetracyanobenzene (TCNB). Synthesis, spectroelectrochemistry and magnetism. Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry, 22:4455--4460, 1997. [PUMA: charge TCNB tetranuclear;magnetism osmium complex magnetism spectroelectrochem magnetism;TCNQ complex;osmium transfer tetranuclear spectroelectrochem;TCNB TCNQ intervalence prepn]