I have noticed that some items get announced to chat when purchased, what items gets anounced and what makes them so special?

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Items that provide "team support". This is so that (1) people know that you are spending money for the team and (2) so that your allies don't double up on an aura item accidentally. |
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From the official patch notes:
Wards, Aura Items, and Legendary items all show up in chat. |
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Support items that help your team or debuff the enemy team. These include (off the top of my head):
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:) Executioner's calling as well. Because it's essentially a built-in ignite, so enemy healers/regenerators are crippled. Lets your team know to focus the one you bast with the activation. |
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People viewing the match in Spectator mode sees all items that are bought such as Wits End in the chat. |
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