RESEARCH ARTICLE Silver(I) Complexes of Bisphosphines PhN{P(OC 6 H 4 C 3 H 5 -o) 2 } 2 (1) and 2,6-{Ph 2 PC(O)} 2 C 5 H 3 N (2) Vitthalrao S. Kashid 1 • Susmita Naik 1 • Maravanji S. Balakrishna 1 Received: 28 June 2016 / Revised: 14 July 2016 / Accepted: 18 July 2016 Ó The National Academy of Sciences, India 2016 Abstract Silver complexes of two bisphosphine ligands, PhN{P(OC 6 H 4 C 3 H 5 -o) 2 } 2 (1) and 2,6-{Ph 2 PC(O)} 2 C 5 H 3 N (2) have been described. Reactions of bisphosphines 1 and 2 with silver salts produce either mononuclear or dinuclear complexes (3–6) depending on the stoichiometry of the reagents and the reaction conditions. All new complexes have been characterized by spectroscopic and analytical data. The structure of spirocyclic complex, [Ag{2,6-{Ph 2- PC(O)} 2 C 5 H 3 N} 2 ][CF 3 SO 3 ](6) has been confirmed by single crystal X-ray analysis. Keywords Bisphosphine Á Silver(I) Á Bidentate ligand Á Coordination chemistry 1 Introduction Close-shell d 10 metal ions such as copper(I), silver(I) and gold(I) have long been demonstrated as preferred metal ions to explore coordination chemistry of bidentate ligands, in particular bisphosphines owing to their linear, trigonal planar as well as tetrahedral coordination modes [1–4]. Further, group 11 metal(I) ions display a wide range of structures when coordinated to phosphorus ligands which impart unusual and intriguing photophysical properties due to the metal–metal and metal–ligand interactions [4–10]. Our group [11–13] and of others [14, 15] have reported several interesting mono- and dinuclear silver(I) and 1D, 2D and 3D-coordination polymers containing various bis- phosphine ligands. Herein, we describe silver(I) complexes of two bisphosphine ligands PhN{P(OC 6 H 4 C 3 H 5 -o) 2 } 2 (1) and 2,6-{Ph 2 PC(O)} 2 C 5 H 3 N(2). 2 Experimental 2.1 General Procedures All manipulations were performed using standard vacuum- line and Schlenk techniques under nitrogen atmosphere unless otherwise stated. All of the solvents were purified by conventional procedures [16] and distilled prior to use. Bisphosphines 1 and 2 were prepared using methods as previously described [17–19]. The metal precursor AgOTf was purchased from Aldrich chemicals and used as received. Other chemicals were obtained from commercial sources and purified prior to use. 2.2 Crystallographic Data The structures was solved by Patterson or direct methods and refined by full-matrix least-squares procedures using the SHELXTL program package [20]. The structure reported in this article have been deposited with the Cambridge Crystallographic Data Centre under registration numbers CCDC-1487675 for complex 6 (selected bond length and bond angles are given in Fig. 1) formula— C 64 H 48 AgCl 2 F 3 N 2 O 7 P 4 S, fw—1348.75, crystal system— triclinic, space group—P-1, cell (A ˚ and deg), a = 13.2501(11) b = 16.8962(15) c = 17.8165(19), a = 115.600(7), b = 93.587(11), c = 111.199(8), V, A ˚ 3 = 3238.2(6), Z = 2, qcalc, g cm -3 = 1.383, l & Maravanji S. Balakrishna krishna@chem.iitb.ac.in 1 Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India 123 Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci. DOI 10.1007/s40010-016-0309-6