[verb (plain)] + ものの [i-adj] + ものの [na-adj] + な / である + ものの [noun] + である + ものの
ものの means "although": the first half is true, but what follows is not what it would lead you to expect. It goes after the plain form of a verb or an い-adjective; a な-adjective takes な or である, and a noun takes である.
A noun cannot take ものの on its own or with だ: ×学生ものの, ×学生だものの → がくせい学生であるものの.
ものの belongs to writing, news and formal speech. In conversation you would say けど or のに.
Most often the first half is a past action – you did something – and the second half is the result that did not follow, frequently a disappointment.
The second half reports a fact. It cannot be a request, an order or something you intend to do.