New Organotin(IV)-Phosphoramidate Complex: Cis-Dichlorido-Trans-Dimethyl-Cis-Bis(N,N′,N″-Tricyclopentylphosphoric Triamide)Tin(IV) Atekeh Tarahhomi*,a, Mehrdad Pourayoubi*,a Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran Organotin (IV) compounds have been attracted to exhibit wide biological activity [1,2]. In recent report by our group, the coordination of phosphoryl ligands containing the RNH―P(O) group to organotin chloride was investigated in solid state structures where the domination of N―H…O═P hydrogen bonds in crystal packing of the free ligands is broken and permits weaker HBs to stabilize the crystal packing [3]. In this work, we report the synthesis and crystal structure of a new organotin(IV)-phosphoramidate complex containing a [C5H9NH]3PO phosphoric triamide ligand, {Sn[(O)P(NHC5H9)3]2(CH3)2Cl2} which is one of the few examples of organotin(IV) tris(alkylamido)phosphate complexes with two phosphoric triamide ligands in cis positions. The asymmetric unit in cis-dichlorido-trans-dimethyl-cis-bis(N,N′,N″-tricyclopentylphosphoric triamide)tin(IV) consists of three crystallographically independent molecules. The SnIV coordination geometry is octahedral with two cis phosphic triamide ligands, two cis chloride ligands and two trans methyl groups. The environment of each N atoms in the phosphoryl donor (PO) ligands (C5H9NH)3P═O is almost planar and it does not form any hydrogen bonds as acceptor, showing its low Lewis-base character. The P atom in (C5H9NH)3P═O adopts a slightly distorted tetrahedral environment. The Sn―O, Sn―Cl and Sn―C bond distances are within exepted values [4]. In the crystal, molecules are aggregated through (N―H)2…Cl hydrogen bonds, forming 1D chain in which the Cl atoms acts as a double hydrogen-bond acceptor. The intramoleculat N―H…O(P) hydrogen bonds, between the amide group of one ligand and the phosphoryl O atom of the other ligand, are also find in the structure. References: [1] S.K. Thodupunoori, I.A. Alamudun, F. Cervantes-Lee, F.D. Gomez, Y.P. Carrasco, K.H. Pannell, J. Organomet. Chem. 691 (2006) 1790. [2] K. Gholivand, Z. Shariatinia, M. Pourayoubi, Polyhedron 25 (2006) 711. [3] A.J. Metta-Magaña, M. Pourayoubi, K.H. Pannell, M. Rostami Chaijan, H. Eshtiagh-Hosseini, J. Mol. Struct. 1014 (2012) 38. [4] M. Pourayoubi, J.A. Golen, M. Rostami Chaijan, V. Divjakovic, M. Negari, A.L. Rheingold, Acta Crystallogr. C67 (2011) m160.

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