Methods for deposition of elemental metal films on surfaces using metal coordination complexes comprising nitrogen-containing ligands are provided. Also provided are nitrogen-containing ligands useful in the methods of the invention and metal coordination complexes comprising these ligands.

An aryl phosphine with fused ring ortho-alkoxy substitution that includes an aryl monophosphine and an aryl bi-sphosphme.

Provided is a catalyst for producing hydrogen, which catalyst has higher performance than conventional catalysts since, for example, it exhibits a certain high level of activity in an aqueous formic acid solution at high concentration even without addition of a solvent, amine and/or the like. The metal phosphine complex is a metal phosphine complex represented by General Formula (1): MH.sub.m(CO)L.sub.n, wherein M represents an iridium, iron, rhodium or ruthenium atom; in cases where M is an iridium or rhodium atom, m=3 and n=2, and in cases where M is an iron or ruthenium atom, m=2 and n=3; and the number n of Ls each independently represent a tri-substituted phosphine represented by General Formula (2): PR.sup.1R.sup.2R.sup.3. The catalyst for producing hydrogen comprises the metal phosphine complex as a constituent component.

The present disclosure is related to organic acceptor-donor-acceptor compounds as non-fullerene acceptors for use in organic photovoltaics.

The invention relates to tetraalkylammonium-tetra- or hexahydroxometallates such as tetraethylammonium hexahydroxoplatinate, (N(alkyl)4)y[M(OH)x], a method for the production thereof, and the use thereof for producing catalysts.

The present disclosure is related to organic acceptor-donor-acceptor compounds as non-fullerene acceptors for use in organic photovoltaics.