NOVELTY - Preparing a coordination polymer involves: providing a composition comprising i) a metal-containing compound that is a source of at least one metal ion, ii) bridging ligand-containing compound that is a source of at least one bridging ligand, iii) a first liquid in which (i) and (ii) are soluble and iv) a second liquid immiscible with the first liquid; mixing the composition to form an emulsion; and maintaining the emulsion for a time sufficient to produce a crystalline coordination polymer.    USE - For preparing coordination polymer; for forming a cured product of a curable composition which is used for forming a membrane, and for forming a coating which is used for separating gas components in a feed gas mixture (all claimed); for separation of gases or liquids including membrane technology, adsorbent technology, filtration technology, molecular storage technologies including gas or fuel storage and transport, catalyst technology including alternatives to zeolitic supports for heterogeneous catalysts, electrical conduction, biotechnology, and sensor technologies.    ADVANTAGE - The coordination polymer crystals have a mean maximum dimension of not greater than 100 mu m. The coordination polymers exhibit unique magnetic and luminescent properties. The emulsion can permit fine-tuned control over the size of the coordination polymer crystals formed. The methods can be easier to carry out, less costly, less energy intensive, less wasteful or more efficient than other methods. The membranes prepared by the polymer crystals can have unique properties over other membranes, or properties normally accessible through greater cost e.g. the membrane can have higher selectivity or permeability toward certain compounds than other membranes. The gas separation provided by the membrane can be more efficient or more effective than other methods of gas separation. The act of introducing or mixing the coordination polymer crystals into a curable composition result in aggregation of the crystals. The is a one-pot method of forming a dispersion of a coordination polymer in a curable compound that avoids the need for a mixing and dispersing step. The emulsion can be formed in a polymeric continuous phase that can subsequently be crosslinked or gelled to form a cured composition or article containing the coordination polymer, thus reducing the number of wasteful processing and vessel transfer operations. By providing a one-pot method, can reduce or eliminate agglomeration of crystals, or can provide better dispersion of crystals than conventional techniques.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) forming (M2) a cured product of a curable composition involving: providing a curable composition comprising coordination polymer crystals, where the coordination polymer crystals is formed by the method (M1); and curing the curable composition, to provide a cured product of the curable composition;    (2) forming (M3) a membrane involving: the method (M1), curing a curable composition to provide a polysiloxane polymer, where the curable composition comprises the emulsion or a curable composition derived from the emulsion, and forming a coating where the coating comprises the emulsion and the polysiloxane polymer comprises a membrane;    (3) forming (M4) a membrane involving: forming a coating, where the coating comprises a curable composition; and coordination polymer crystals formed by the method (M1) and curing the coating, to provide a membrane; and    (4) separating (M5) gas components in a feed gas mixture involving: contacting a first side of a membrane with a feed gas mixture comprising at least a first gas component and a second gas component to produce a permeate gas mixture on a second side of the membrane and a retentate gas mixture on the first side of the membrane, where the permeate gas mixture is enriched in the first gas component, and the retentate gas mixture is depleted in the first gas component.