First Silver(I) – Complexes with Tetrazole Allyl Derivatives. Synthesis and Crystal Structure of [Ag2(C10H10N4S)2(H2O)2](BF4)2 and [Ag(C10H9ClN4S)(NO3)] π-Compounds (C10H10N4S and C10H9ClN4S – 5- (Allylthio)-1-phenyl- and 5-(Allylthio)-1-(4-chlorophenyl)-

Crystalline silver(I) π-complexes [Ag2(atpt)2(H2O)2](BF4)2 (1) (atpt – 5-(allylthio)-1-phenyl-1H-tetrazole (C10H10N4S)) and πAg(atcpt)(NO3)] (2) (atcpt – 5-(allylthio)-1-(4-chlorophenyl)-1H-tetrazole (C10H9ClN4S)) complexes have been obtained using silver salt and the organic ligands. Compounds were characterized by X-ray single crystal diffraction: for 1 space group P21 /n, a = 10.4560(5), b = 11.4008(5), c = 12.7550(7) Å, β= 98.128(3)°, V = 1505.21(13) Å3 at 200 K, Z = 2; for 2: space group P21 /a, a = 8.6790(8), b = 13.7324(10), c = 12.4597(13) Å, β= 102.288(5)°, V = 1451.0(2) Å3 at 200 K, Z = 4. In both structures silver(I) atoms possess a trigonal pyramidal coordination environment with essentially different coordination modes of organic ligands. The Ag(I) arrangement in 1 involves the N3 and N4 atoms of two adjacent atpt molecules, an olefin C=C bond and a water molecule at the apical position. In crystal structure of 2 two O atoms from NO3 – anions occupy two equatorial position of silver(I) coordination polyhedron, and atcpt is attached to the metal centre through the N4 atom of tetrazole core only. The weakly bound C=C bond is located at the apical position of Ag(I) environment.