Novel solvates in AgX:dpex (n:1) systems (n=1 or 2); X=oxyanion; dppx=Ph2P(Y)PPh2, Y=(CH2)3, Fc

Fifteen Years of Scientific Investigation into Main Groups and Transition Metal Coordination Chemistry with Allan White

The outcomes of the investigations on the structures and reactivity of a massive number of main group and transition metal complexes containing different families of ligands are reviewed. All the data result from the scientific collaboration between the research groups of Claudio Pettinari and Allan White which lasted fifteen years.

Silver(i) complexes with 1'-(diphenylphosphino)-1-cyanoferrocene: the art of improvisation in coordination

1'-(Diphenylphosphino)-1-cyanoferrocene () reacts with silver(i) halides at a 1 : 1 metal-to-ligand ratio to afford the heterocubane complexes [Ag(μ3-X)(-κP)]4, where X = Cl (), Br (), and I (). In addition, the reaction with AgCl with 2 equiv. of leads to chloride-bridged dimer [(μ-Cl)2{Ag(-κP)2}2] () and, presumably, also to [(μ(P,N)-){AgCl(-κP)}]2 (). While similar reactions with AgCN furnished only the insoluble coordination polymer [(-κP)2Ag(NC)Ag(CN)]n (), those with AgSCN afforded the heterocubane [Ag(-κP)(μ-SCN-S,S,N)]4 () and the thiocyanato-bridged disilver(i) complex [Ag(-κP)2(μ-SCN-S,N)]2 (), thereby resembling reactions in the AgCl- system. Attempted reactions with AgF led to ill-defined products, among which [Ag(-κP)2(μ-HF2)]2 () and [(μ-SiF6){Ag(-κP)2}2] () could be identified. The latter compound was prepared also from Ag2[SiF6] and . Reactions between and AgClO4 or Ag[BF4] afforded disilver complexes [(μ(P,N)-)Ag(ClO4-κO)]2 () and [(μ(P,N)-)Ag(BF4-κF)]2 () featuring pseudolinear Ag(i) centers that are weakly coordinated by the counter anions. A similar reaction with Ag[SbF6] followed by crystallization from ethyl acetate produced an analogous complex, albeit with coordinated solvent, [(μ(P,N)-)Ag(AcOEt-κO)]2[SbF6]2 (). Ultimately, a compound devoid of any additional ligands at the Ag(i) centers, [(μ(P,N)-)Ag]2[B(C6H3(CF3)2-3,5)4]2 (), was obtained from the reaction of with silver(i) tetrakis[3,5-bis(trifluoromethyl)phenyl]borate. The reaction of Ag[BF4] with two equivalents of produced unique coordination polymer [Ag(-κP)(μ(P,N)-)]n[BF4]n (), the structure of which contained one of the phosphinoferrocene ligands coordinated as a P,N-chelate and the other forming a bridge to an adjacent Ag(i) center. All of these compounds were structurally characterized by single-crystal X-ray crystallography, revealing that the lengths of the bonds between silver and its anionic ligand(s) typically exceed the sum of the respective covalent radii, which is in line with the results of theoretical calculations at the density-functional theory (DFT) level, suggesting that standard covalent dative bonds are formed between silver and phosphorus (soft acid/soft base interactions) while the interactions between silver and the ligand's nitrile group (if coordinated) or the supporting anion are of predominantly electrostatic nature.

Synthesis of [{AgO2CCH2OMe(PPh3)} n ] and theoretical study of its use in focused electron beam induced deposition

The synthesis, chemical and physical properties of [{AgO₂CCH₂OMe} _n ] (1) and [{AgO₂CCH₂OMe(PPh₃)} _n ] (2) are reported. Consecutive reaction of AgNO₃ with HO₂CCH₂OMe gave 1, which upon treatment with PPh₃ produced 2. Coordination compound 2 forms a 1D coordination polymer in the solid state as evidenced by single crystal X-ray structure analysis. The coordination geometry at Ag⁺ is of the [3 + 1] type, whereby the carboxylate anions act as bridging ligands. The formation of PPh₃-Ag(I) coordinative bonds results in distorted T-shaped AgPO₂ units, which are stabilized further by an additional O-Ag dative bond. TG and TG-MS measurements show that 1 and 2 decompose at 190-250 °C (1) and 260-300 °C (2) via decarboxylation, involving Ag-P (2), C-C and C-O bond cleavages to give elemental silver as confirmed by PXRD studies. In order to verify if polymeric 2 is suitable as a FEBID precursor for silver deposition, its vapor pressure was determined (p_{170 °C} = 5.318 mbar, ∆H_vap = 126.1 kJ mol^-1), evincing little volatility. Also EI and ESI mass spectrometric studies were carried out. The dissociation of the silver(I) compound 2 under typical electron-driven FEBID conditions was studied by DFT (B3LYP) calculations on monomeric [AgO₂CCH₂OMe(PPh₃)]. At an energy of the secondary electrons up to 0.8 eV elimination of PPh₃ occurs, giving Ag⁺ and O₂CCH₂OMe^-. Likewise, by release of PPh₃ from [AgO₂CCH₂OMe(PPh₃)] the fragment [AgO₂CCH₂OMe]^- is formed from which Ag⁺ and O₂CCH₂OMe^- is generated, further following the first fragmentation route. However, at 1.3 eV the initial step is decarboxylation giving [AgCH₂OMe(PPh₃)], followed by Ag-P and Ag-C bond cleavages.

Application of UV-absorbing silver(i) luminescent down shifter for PTB7 organic solar cells for enhanced efficiency and stability

The material Ag(POP)(Bphen)](BF₄) was used as luminescent down-shifter (LDS). The LDS serves two purposes. Firstly it improves the photocurrent of the OPV. Secondly, the layer reduces the effect of UV, leading to enhanced lifetime.

Crystal structure of bis(µ2-1,3-bis(diphenylphosphino)propane-κ2P,P')- bis(acetato-κ2O,O')disilver(I)-methanol (1:4), [Ag2(CH3COO)2(C27H26P2)2]·4CH3OH, C62H74Ag2O8P4

C62H74Ag2O8P4, monoclinic, P21/n (no. 14), a = 10.024(1) Å, b = 17.888(1) Å, c = 17.730(2) Å, β = 106.233(2)°, V = 3052.3 Å3, Z = 2, Rgt(F) = 0.0531, wRref(F2) = 0.1483, T = 298 K.

One-dimensional silver(i) coordination polymers containing cyclodiphosphazane, cis-{(o-MeOC6H4O)P(µ-NtBu)}2

The 1:1 reaction between the cyclodiphosphazane cis-{(o-MeOC(6)H(4)O)P(mu-N(t)Bu)}(2) (1) and AgOTf afforded one-dimensional Ag(I) coordination polymer [Ag{mu-OTf-kappaO,kappaO}{mu-(o-MeOC(6)H(4)O)P(mu-N(t)Bu)-kappaP,kappaP}(2)](infinity) (2) containing bridging cyclodiphosphazane and trifluoromethanesulfonate (OTf) ligands. The 2:1 reaction of and AgOTf leads to the formation of simple mononuclear complex [Ag{OTf-kappaO,kappaO}({(o-MeOC(6)H(4)O)P(mu-N(t)Bu)-kappaP}(2))(2)] (3) in quantitative yield. Reaction of 1 with AgCN produces a strain-free zig-zag coordination polymer [({(o-MeOC(6)H(4)O)P(mu-N(t)Bu)-kappaP,kappaP}(2))(2)Ag(NCAgCN)](infinity) (4) irrespective of reaction stoichiometry and conditions. In complexes 3 and 4 cyclodiphosphazanes coordinate to Ag(I) centers in a monodentate fashion. Single crystal structures were established for the Ag(I) polymers 2 and 4.