Concomitant polymorphic behavior of di-l-thiocyanato-j2N:S;j2S:N-bisbis(tri-p-fluorophenylphosphine-jP)silver(I)

摘要

The structures of two polymorphs, both monoclinicP21/n polymorph (I) and P21/c polymorph (II), of di--thiocyanato-2N:S;2S:N-bisbis(tri-p-fluorophenylphosphine-P)silver(I) complexes have been determined at 100 K. Inboth polymorphs the complex has a dinuclear structure wherethe silver(I) coordinates to two phosphine ligands and twobridging thiocyanate anions to form complexes with distortedtetrahedral geometry. Polymorph (I) has just one half of theAg2(SCN)2{P(4-FC6H4)3}4 molecule at (0, 12, 0) from theorigin in the asymmetric unit. Polymorph (II) has one and ahalf molecules of Ag2(SCN)2{P(4-FC6H4)3}4 in the asymmetricunit; the half molecule is situated at (0, 1, 12), while thefull molecule is located at (1/3, 12, 1/3) from the origin. TheAg—P bond distances range from 2.4437 (4) to 2.4956 (7) A ° inboth polymorphs. The Ag—S distances are 2.5773 (7) A ° in (I)and 2.5457 (5), 2.5576 (5) and 2.5576 (5) A ° in (II). The fullmolecule in polymorph (II) has slightly shorter Ag—N bonddistances 2.375 (1) and 2.367 (2) A ° compared with the halfmolecules in both polymorphs 2.409 (2) A ° in (II) and2.395 (2) A ° in (I). The two polymorphs are compared usingr.m.s. overlay calculations as well as half-normal probabilityplot analysis.