Crystal chemistry in the USSR

DFT study of the role of intermolecular interactions in the formation of stable halogeno– and ammineaqua– platinum(II) coordination compounds

“…2) that can be responsible for its significant stabilization. The Pt…Pt distance is in good agreement with the values found in the solid state for cis ‐[Pt(NH 3 ) 2 Cl 2 ] 2 , which alternate between 3.372–3.402 Å 5, 6.…”

“…However, the Pt…Pt distance (3.085 10–3.104 11 Å) is sufficiently short to enable the formation in solution of oligomeric carboxylates 1 or platinum blues with amidato‐bridges 2, 3 after further ligand substitution reactions. On the other hand, it is not possible to exclude the possibility of emergence of a “column motif” with short Pt…Pt distances during the polymerization of [ cis ‐Pt(NH 3 ) 2 (H 2 O) 2 ] 2+ or [ cis ‐Pt(NH 3 ) 2 (H 2 O)(OH)] + , similar to the motif experimentally found in [ cis ‐Pt(NH 3 ) 2 Cl 2 ] 5, 6.…”

“…It seems likely that one of the main reasons for this different chemical behavior derives from the nonvalence interactions present only in the cis ‐forms. In fact, the characteristic feature of many square planar platinum(II) complexes, like [ cis ‐Pt(NH 3 ) 2 Cl 2 ], is the formation, in the solid state, of linear chains {…Pt…Pt…Pt…} n with weak metal–metal interactions 4–8.…”

Synthesis of 5‐Substituted 2‐Methylbenzimidazoles with Anticancer Activity

“…2-Methyl-5-nitro-1H-benzimidazole (2) was prepared from 2-methyl-1H-benzimidazole (1) [11][12][13][14][15][16] according to the method developed by Efros [10]. Reduction of the nitro compound 2 was achieved in good yield by using iron powder and iron sulphate to produce the 5-amino derivative 3 [10].The diazonium chloride of compound 3 was obtained by using hydrochloric acid and sodium nitrite at 0°C.…”

Structures and Mutagenic Properties of Products Obtained by C‐Nitrosation of Opipramol

“…para to the tertiary amino group of the ring system, as it is also known for other tertiary aromatic amines. For example, imipramine forms 2-nitroso-imipramine, when treated with HNOz [23]; N,N-dialkylanilines form p-nitroso derivatives [24] [25]. Such nitroso compounds are readily oxidized in situ if an excess of nitrite is used [26].…”