1) It is a good thing to give a donation to charity before praying, as it says “And I will see you face with charity!”. (Shulchan Aruch and Mishne Berurah 90)

2) In some places there is a custom to give a donation to charity while saying the paragraph of “Vayevarech David” when reaching the words “And the wealth and the honor come from You, and You rule over everything”. (ibid)