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What plant is this?

It is possible your plant is under-watered. This can be determined by touching the soil - is it dry to the touch? If it is, I would recommend watering it.
If you see new growth your plant may have a chance.

What type of plants are they?

Some of the yellowing could be due to watering issues; too much or too little.
The soil in your container appears dry. Container plantings may need watering daily in warm conditions.

There could also be nutrient deficiency, this could cause leaf chlorosis and leaf yellowing.

A low nitrogen fertilizer can be applied in spring.

I should mention that winter cold can also discolor leaves.

I do see some spotting on the leafs. This could indicate a fungus or bacterial leaf spot disease.

Here is a link to refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/trees/sand-cherry/purple-leaf-sandcherry-info.htm

Here is an article that will help you.
https://www.gardeningknowhow.com/plant-problems/environmental/acid-rain-damage.htm

This article will give you some ideas on how to improve drainage:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/yard-drainage-problems.htm

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